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News Lead: Recently, IIW Indonesia International Industrial Week & Fastener Exhibition grandly opened in Jakarta, Indonesia, connecting the whole industrial chain of infrastructure construction, industrial manufacturing and engineering machinery across Southeast Asia. As a well-experienced expert focusing on anti-loosening fastening solutions, Ningbo Yinzhou Zhenhua Stamping Parts Co., Ltd. participated in this influential industrial exhibition. The company brought a full range of high-performance anti-loosening stamping fasteners and mature customized fastening technical solutions. With decades of experience in solving fastening loosening problems and all-round premium supporting services, Zhenhua accurately meets the rigid demands of Indonesia’s infrastructure market and fuels the steady construction of local infrastructure projects with professional fastening technology. Decades of Industry Experience, Professional Expertise in Anti-loosening Fastening Field As a time-honored enterprise specializing in metal stamping and anti-loosening fasteners, Ningbo Yinzhou Zhenhua Stamping Parts has long focused on core industry pain points, including fastener loosening caused by equipment vibration, corrosion under humid outdoor environment, and fastener failure under long-term heavy load working conditions. The company focuses on the R&D and production of precision anti-loosening washers, Belleville disc springs and locking stamping parts. Relying on mature cold stamping technology, independent mold development system and strict full-process quality control standards, Zhenhua provides integrated long-term stable, vibration-resistant and corrosion-proof anti-loosening fastening solutions for global engineering projects and industrial equipment. Different from ordinary hardware manufacturers, Zhenhua takes solving fastener loosening problems professionally as its core positioning. Optimizing product materials and structural design according to Southeast Asia’s special working conditions featuring high temperature, high humidity, frequent typhoons and outdoor heavy load, our products effectively solve common problems in Indonesia’s road construction, bridge projects, power station construction and industrial park projects, such as fastener loosening, rusting and insufficient service life, perfectly adapting to the harsh local construction environment. Meeting Local Market Demands, Empowering Indonesian Infrastructure with Premium Products & Full-chain Services Indonesia is currently accelerating the construction of new capital city, highway network upgrading, power energy projects and industrial park expansion, leading to a surging market demand for industrial fasteners with high stability, weather resistance and safety. During the IIW Indonesia exhibition, Zhenhua displayed full-series anti-loosening stamping fasteners suitable for all infrastructure scenarios, attracting numerous local engineering contractors, equipment manufacturers, hardware distributors and infrastructure purchasers for in-depth business negotiations. Apart from high-quality standard fastening products, Zhenhua also provides one-stop exclusive services for Indonesian clients, including drawing customization, working condition matching selection, on-site technical consultation and full after-sales follow-up. Breaking the single product supply mode, we cover all cooperation links from early working condition analysis and product customization to later delivery tracking and technical after-sales support, fully meeting overseas clients’ procurement and project implementation needs with refined services. Exploring Southeast Asian Blue Ocean Market, Deepening Long-term Strategic Cooperation According to Zhenhua’s on-site representative, Indonesia’s infrastructure industry is in a rapid development period, and high-quality anti-loosening fasteners are core components to ensure the safety and service life of infrastructure projects. By attending this exhibition, Zhenhua aims to export premium stamping fastening products as well as mature anti-loosening technical experience and engineering supporting solutions to Indonesia market. In the future, Ningbo Yinzhou Zhenhua Stamping Parts will continue to explore the Southeast Asian market, upgrade products adapted to local working conditions, improve cross-border service systems, cooperate deeply with local Indonesian partners, support the safe and high-quality development of local infrastructure projects, and jointly build a better industrial and infrastructure ecosystem in Southeast Asia.

In industries like manufacturing, electronics, and automotive engineering, bolt loosening has long been a persistent headache for engineers and production teams. Vibration during equipment operation causes fasteners to come loose, leading to minor issues like unexpected downtime, or severe consequences like safety hazards. Traditional anti-loosening solutions are either costly, complicated to install, or incompatible with tight spaces and soft materials. The DIN 6798 series serrated lock washers are designed specifically to solve these problems, offering a cost-effective and reliable anti-loosening solution.   1.Core Working Principle: Secure Locking Through "Bite" The DIN 6798 series, a German standard for serrated lock washers, includes various configurations such as external-tooth (Type A), internal-tooth (Type J), and countersunk (Type V). Its principle is simple yet highly effective: Bite & Lock: When the bolt or nut is tightened, the serrated teeth on the washer firmly grip the fastener head and the surface of the connected part, drastically increasing contact friction and directly preventing rotation and loosening under vibration. Elastic Compensation: The washer's inherent slight elastic deformation compensates for the loss of preload in bolted joints under long-term load, preventing connection failure due to stress relaxation. Application-Specific Design: Different tooth profiles suit different scenarios. External-tooth washers are ideal for applications with ample flat space, internal-tooth washers work well with smaller bolt heads and limited external space, while countersunk washers are made for countersunk screws, balancing anti-loosening performance with a flush appearance. 2.Solving Industry Pain Points: Key Advantages of DIN 6798 Eliminate Vibration-Induced Loosening for Ultimate Reliability：Addressing the common issue of fasteners loosening under sustained vibration, the dual anti-loosening mechanism of serrated bite and high friction offers far better performance than regular spring washers or flat washers. Especially suited for high-vibration applications like automotive chassis, construction machinery, and motor equipment, it puts an end to the "the more it vibrates, the looser it gets" problem.  Zero Installation Barriers, Suitable for Multiple Working Conditions：For soft materials like aluminum alloys, plastics, and thin sheets, the serrated teeth provide a firm yet gentle grip. They ensure anti-loosening performance without crushing or damaging the surface, perfectly solving the anti-loosening challenge for soft material connections. Gentle on Soft Materials, Protecting Connected Parts：For soft materials like aluminum alloys, plastics, and thin sheets, the serrated teeth provide a firm yet gentle grip. They ensure anti-loosening performance without crushing or damaging the surface, perfectly solving the anti-loosening challenge for soft material connections. Compact Design for Confined Spaces：Compared to bulkier solutions like nylon lock nuts or special anti-loosening bolts, DIN 6798 washers are thin and take up minimal space. They are ideal for applications with limited room, such as electronic appliances, sheet metal enclosures, and small equipment, without affecting the overall structure or aesthetics. 3.Versatile Applications: Anti-Loosening Solutions for Every Industry Automotive & Rail Transit：Installation of interior parts and electrical modules, meeting both anti-loosening and lightweight requirements, and fitting into tight installation spaces. Construction Machinery & Industrial Equipment：Connection of sheet metal frames and equipment enclosures, compatible with different materials while offering both anti-loosening and anti-corrosion benefits. Sheet Metal Fabrication & Hardware Products：Assembly of furniture hardware and outdoor equipment, offering rust and anti-loosening performance in humid and outdoor environments. 4.The reason choose DIN6798：As a standardized industrial fastener, the DIN 6798 series, with its mature German-standard craftsmanship and consistent quality control, has become a cost-effective choice for anti-loosening washers: Comprehensive Standard Sizes: A full range of tooth profiles and dimensions to fit most common bolt sizes, enabling quick selection without customization. Cost-Effective: More affordable than specialty anti-loosening fasteners, offering significant advantages for bulk procurement. Stable & Durable: Stainless steel construction offers excellent corrosion and wear resistance, extending service life and reducing maintenance and replacement costs.   Whether it's a critical connection in large industrial equipment or a detail fastening in small electronic devices, the DIN 6798 series serrated lock washers provide a reliable, low-cost solution to your fastener anti-loosening pain points, safeguarding the stable operation of your equipment.  

In the dynamic landscape of global hardware manufacturing, few names resonate with the spirit of resilience and innovation like Zhenhua Stamping Parts Co., Ltd. For over three decades, this trailblazing enterprise has not only witnessed the transformation of the industry but has actively shaped its trajectory, riding the waves of progress while staying true to its core values of precision, quality, and adaptability.   The story of Zhenhua Stamping began in the early 1990s, a time when China's manufacturing sector was on the cusp of a historic boom. Founded by a team of visionary engineers with a passion for metalworking, the company started as a modest workshop, producing basic stamping parts for local machinery factories. Even in those early days, Zhenhua distinguished itself through an unwavering commitment to excellence, investing in state-of-the-art equipment and fostering a culture of continuous learning among its workforce.   As the new millennium dawned, Zhenhua Stamping seized the opportunity to expand its horizons. Recognizing the growing demand for high-quality hardware components in international markets, the company embarked on a journey of globalization, obtaining ISO 9001 certification and aligning its production processes with stringent international standards. This strategic move paid off, as Zhenhua began supplying precision stamping parts to leading industrial machinery manufacturers across Europe, Africa, the Middle East, and the Balkans.     Today, as Zhenhua Stamping celebrates over 30 years of success, the company stands as a testament to the power of perseverance and innovation. With a sprawling, modern manufacturing facility equipped with the latest stamping, machining, and quality control equipment, Zhenhua is capable of producing a wide range of high-precision hardware components, including German-standard lock washers, DIN standard fasteners, and custom stamping parts for a diverse array of industries.   What truly sets Zhenhua Stamping apart, however, is its people. The company's team of skilled engineers, technicians, and production workers brings decades of experience and a shared commitment to excellence to every project. Whether working on a large-scale production run or a custom-designed prototype, Zhenhua's employees take pride in delivering products that meet the highest standards of quality and reliability.   As the world continues to evolve, Zhenhua Stamping remains poised to meet the challenges and opportunities of the future. The company is actively exploring new technologies such as 3D printing and artificial intelligence, with the goal of further enhancing its production capabilities and offering even more innovative solutions to its customers. With a proven track record of success and a clear vision for the future, Zhenhua Stamping is well-positioned to continue leading the way in the global hardware manufacturing industry for many years to come.   In an era of rapid change and uncertainty, Zhenhua Stamping Parts Co., Ltd. stands as a beacon of stability and progress. For over 30 years, the company has stayed true to its founding principles while embracing innovation and adapting to the ever-changing needs of the market. As Zhenhua looks to the future, it does so with confidence, knowing that its commitment to quality, innovation, and customer satisfaction will continue to drive its success in the years ahead.

The 16th Fastener Expo Shanghai (FES 2026) was successfully held at National Exhibition and Convention Center (Shanghai) from June 24 to 26. Ningbo Yinzhou Zhenhua Stamping Parts participated in the grand exhibition with a full range of washers and precision custom non-standard stamping parts. Relying on mature stamping manufacturing technology and customized R&D capacity, we held in-depth communications with purchasers and clients from home and overseas, fully demonstrating our core advantages in hardware stamping supporting manufacturing. As a professional manufacturer with years of experience in stamping production, Ningbo Yinzhou Zhenhua Stamping Parts specializes in standard and non-standard washers, including flat washers, spring washers, circlip washers, precision sealing washers and more. We adopt diverse raw materials such as 304/316 stainless steel, 65Mn spring steel and carbon steel. Besides washers, we accept orders for complex-structured, special-size custom non-standard stamping components. We own independent mold development workshops, precision progressive stamping lines and one-stop surface treatment services, capable of rapid sampling and mass delivery according to drawings from new energy, industrial equipment, electronic appliances, construction machinery and other industries. During the exhibition, dozens of high-precision washer samples and custom stamping prototypes drew crowds of domestic and overseas buyers for consultation. Our strict dimensional tolerance control, stable hardness & surface finishing, flexible MOQ support won wide recognition from on-site visitors. For years, Zhenhua Stamping Parts has served domestic manufacturers with rigorous quality inspection, reliable lead time and cost-effective solutions. Our products are exported to Southeast Asia, Europe, America, the Middle East and other global regions, winning consistent trust from clients worldwide. This exhibition acts as an efficient trade platform connecting Zhenhua Stamping Parts with global partners. We will keep upgrading precision stamping technology and optimizing customized non-standard processing services in the future. New and existing global customers are welcome to send drawings for inquiries about all types of washers and non-standard stamping parts, to build long-term reliable cooperation.

Ningbo Yinzhou Zhenhua Stamping Co., Ltd., a professional manufacturer specializing in fastening components and precision metal stamping parts, will participate in the Shanghai International Fastener Expo, one of the leading industry events for fasteners, fastening technology, and industrial components. The exhibition provides an excellent opportunity for Zhenhua to present its latest products, manufacturing capabilities, and customized solutions to customers and partners from around the world. As global industries continue to demand higher standards of safety, reliability, and durability, the role of high-performance fastening components has become increasingly important across a wide range of applications. Focus on Anti-Loosening Fastening Solutions At this year's exhibition, Zhenhua will showcase a comprehensive range of fastening products designed to improve connection reliability and reduce the risk of loosening caused by vibration and dynamic loads. Among the featured products are DIN 6798 serrated lock washers, DIN 6797 lock washers, and NFE 25-511 safety washers. These products are widely used in industries where secure fastening is critical, including automotive manufacturing, railway transportation, power systems, renewable energy equipment, industrial machinery, and construction engineering. Designed to provide superior locking performance, these washers help improve equipment safety, extend service life, and reduce maintenance requirements in demanding operating environments. Comprehensive Spring Washer Product Portfolio In addition to lock washers and safety washers, Zhenhua offers a complete range of spring washer products, including wave spring washers and disc spring washers. These components are designed to provide preload compensation, vibration absorption, and load distribution in mechanical assemblies. Their excellent elastic properties make them suitable for applications that require stable fastening performance under changing loads and operating conditions. With extensive production experience and strict quality control procedures, Zhenhua is able to supply spring washer solutions that meet the performance requirements of various industrial sectors. Precision Metal Stamping and Custom Manufacturing Services One of Zhenhua's key strengths is its ability to provide customized metal stamping solutions. Supported by advanced tooling technology and experienced engineering teams, the company can manufacture a wide variety of precision metal stamping parts according to customer drawings, specifications, or samples. From product development and tooling design to mass production and quality inspection, Zhenhua offers comprehensive support throughout the manufacturing process. Custom stamping products are widely used in electrical equipment, automotive systems, renewable energy installations, communication equipment, industrial automation devices, and many other industrial applications. Advanced Manufacturing and Quality Assurance To ensure consistent product quality and production efficiency, Zhenhua continuously invests in modern manufacturing equipment and quality management systems. The company operates professional stamping production lines equipped with precision inspection instruments and advanced processing equipment. Strict quality control measures are implemented throughout every stage of production, from raw material sourcing to finished product inspection. This commitment to quality enables Zhenhua to deliver products with reliable performance, dimensional accuracy, and long-term durability that meet the expectations of customers worldwide. Serving Global Industrial Markets Over the years, Zhenhua has established long-term partnerships with customers across Europe, Southeast Asia, the Middle East, South America, and other international markets. By combining stable product quality, competitive manufacturing capabilities, and responsive customer service, the company has earned the trust of global buyers seeking reliable fastening and stamping solutions. As industries such as electric vehicles, renewable energy, industrial automation, and intelligent manufacturing continue to grow, demand for high-quality fastening components and precision stamped parts is expected to increase steadily. Zhenhua remains committed to continuous improvement and innovation to support the evolving needs of global manufacturers. Meet Zhenhua at the Shanghai International Fastener Expo The Shanghai International Fastener Expo serves as an important platform for industry professionals to explore new technologies, discover reliable suppliers, and establish long-term business partnerships. Ningbo Yinzhou Zhenhua Stamping Co., Ltd. welcomes visitors, distributors, OEM manufacturers, and industry partners to learn more about its fastening products, spring washer solutions, and precision metal stamping capabilities. The company looks forward to building new partnerships and contributing to the advancement of fastening technology and industrial manufacturing worldwide.

Jakarta, Indonesia (June 3-6, 2026) — The annual Indonesia International Industrial Week (IIW), one of Southeast Asia’s most influential industrial exhibitions, grandly opened at JIExpo Kemayoran Jakarta. Ningbo Yinzhou Zhenhua Stamping Parts Co., Ltd. made a stunning appearance at the event with a full range of standard fasteners, lock washers and customized stamping components, officially launching its in-depth layout of the Indonesian and ASEAN markets. As a core platform connecting global industrial resources and Southeast Asian manufacturing demand, this year’s IIW exhibition gathered over 1,800 exhibitors worldwide and more than 52,000 professional buyers, covering industrial machinery, hardware fasteners, metal processing and other key industrial sectors. Relying on more than 30 years of manufacturing experience in the stamping industry, Zhenhua brought mature and reliable industrial supporting products tailored to the local industrial environment. All products displayed by the company strictly comply with international DIN and ASME standards, adopting high-quality carbon steel and 304/316 stainless steel materials. The products are widely applicable to automobile manufacturing, engineering machinery, rail transit and other fields, featuring high durability, strong corrosion resistance and stable performance, which can fully adapt to the high temperature and high humidity working environment in Southeast Asia. During the four-day exhibition, the Zhenhua overseas business team conducted in-depth one-on-one negotiations with local Indonesian manufacturers, engineering enterprises and international trading companies. A number of preliminary cooperation intentions were reached on product bulk procurement and customized supporting services. According to the person in charge of Zhenhua, Southeast Asia is one of the fastest-growing manufacturing regions in the world, and Indonesia, as the core industrial hub of ASEAN, has a huge incremental demand for high-quality industrial fasteners. This exhibition serves as an important window for Zhenhua to explore the Southeast Asian market. In the future, the company will rely on its stable production capacity and strict quality control system to provide cost-effective and reliable industrial component solutions for local customers, build a solid Sino-Indonesian industrial cooperation bridge, and help upgrade the regional manufacturing supply chain.  

As a professional manufacturer of metal stampings based in Yinzhou, Ningbo, Zhenhua Hardware has long specialized in precision fasteners. Targeting the critical industry pain point of bolts loosening under vibration, the company proudly introduces its DIN25201 Wedge Lock Washers, offering a "never-loosen" connection solution for rail transit, construction machinery, new energy equipment, and other demanding sectors   1.What are DIN25201 Wedge Washers? Wedge Washers are mechanical locking fasteners designed for use in pairs, with DIN25201 being the dominant international standard. The system consists of two identical washers. Each has radial serrations on one side and a wedge-shaped cam surface on the other. The key design feature is that the cam angle (α) is greater than the thread pitch angle (β). During installation, the two washers are placed cam-to-cam, with the serrated sides facing the nut and the workpiece. Instead of relying on friction, they use tension to lock. When subjected to vibration or shock, any loosening movement is restricted to a slight lifting between the two inner cam surfaces. Because α > β, this movement creates a self-locking wedge effect that tightens the connection rather than loosening it, providing absolute security. 2. Core Applications DIN25201 Wedge Washers are engineered for critical joints exposed to severe vibration, dynamic loads, and shock: Rail Transportation: High-speed rail, subway bogies, track fasteners, and carriage connections Construction Machinery: Excavators, cranes, mining equipment chassis, and hydraulic systems New Energy: Wind turbine towers & nacelles, solar panel mounting structures Automotive & EV: Chassis, engines, transmissions, and electric vehicle battery packs Industrial Equipment: Machine tools, compressors, pumps, and automated production lines 3.Solving Critical Industry Pain Points Unmatched Reliability: 100% mechanical lock, unaffected by vibration, temperature, or lubrication; proven by Junker tests Lower Maintenance Costs: Lifetime freedom from re-tightening and inspections, drastically reducing downtime Eco-Friendly: No chemicals, no aging, fully recyclable

In countless industrial scenarios such as mechanical manufacturing, automotive assembly, electronic equipment, and construction machinery, a tiny loose bolt may cause equipment failure, production halt, or even safety hazards. And Zhenhua spring washers are the "invisible guardians" safeguarding every fastening connection, providing a solid foundation for industrial safety and stable operation with their exquisite craftsmanship and outstanding quality.    As a professional brand deeply rooted in the fastener industry for many years, Zhenhua is well aware that "details determine success or failure". The spring washers under its brand are made from high-quality materials such as 65Mn high-elasticity spring steel and SUS304/316 stainless steel, strictly following domestic and international standards such as GB/T 93 and DIN 127. From material selection to forming, they undergo multiple precise processes and rigorous quality inspections to ensure that each product has the core advantages of super elasticity, long-lasting anti-loosening, and wear and corrosion resistance. When the bolt is tightened, the Zhenhua spring washer is precisely compressed, generating a continuous reverse tension through its excellent elastic deformation, firmly locking the threaded pair and forming a stable friction torque. Whether it is high-frequency vibrating mechanical equipment, outdoor facilities with sudden temperature changes, or industrial production lines that operate continuously, it can effectively resist the risk of loosening, preventing problems such as abnormal equipment noise, component displacement, and performance degradation caused by loose fasteners. The product specifications cover the full range from M3 to M36, suitable for bolts of different sizes and various installation scenarios; surface treatments such as galvanizing, blackening, and Dacromet are available to meet the needs of conventional, humid, and corrosive working conditions. Whether it is the fastening of automotive chassis, the assembly of electrical equipment, or the installation of rail transit, precision instruments, and home hardware, Zhenhua spring washers can be perfectly adapted, playing a significant role with their compact size. Choosing Zhenhua is not only choosing a high-quality fastener but also a professional, reliable, and worry-free industrial supporting solution. With stable performance, high cost-effectiveness, and comprehensive supply services, Zhenhua spring washers have become the preferred choice for thousands of enterprises, selling well across the country and in overseas markets. Small washers, big responsibility; strong fastening, no hidden dangers. Zhenhua spring washers, with craftsmanship casting quality and stability safeguarding safety, provide protection for every fastening, making industrial connections more reliable and production operations more reassuring!

Indonesia is currently undergoing large-scale infrastructure expansion, including the construction of the new capital Nusantara, upgrades to 44 national industrial zones, urban high-rise buildings, railway transit systems, coastal ports, and photovoltaic power plant projects. However, Indonesia’s unique tropical climate — characterized by high temperature, high humidity, heavy rainfall, and severe coastal salt spray corrosion — poses extremely strict requirements on the stability, durability, and corrosion resistance of engineering fasteners. For long-term structural safety and stable operation of infrastructure, selecting professional, high-quality, environment-adaptive fasteners is the core guarantee for project quality. As a professional manufacturer of precision stamping fasteners,Ningbo Yinzhou Zhenhua Stamping Co., Ltd. provides a full range of optimized fastener solutions tailored for Indonesian infrastructure construction, effectively solving common engineering problems such as loosening, rusting, deformation, and structural instability. 1. Core Fastener Selection Standards for Indonesian Infrastructure Infrastructure projects in Indonesia face complex working conditions such as long-term vibration, alternating load, coastal salt erosion, and outdoor aging. Standard ordinary fasteners are prone to rust, loose connection, and service life attenuation, which bring hidden dangers to engineering safety. Therefore, infrastructure construction must adhere to four core selection criteria: high strength, strong anti-corrosion performance, reliable anti-loosening ability, and excellent vibration resistance. Different scenarios such as steel structure buildings, bridge transit, new energy photovoltaic projects, and port facilities require targeted customized fastener matching to ensure long-term structural stability. 2. Zhenhua High-Quality Fastener Series Recommended for Indonesian Projects Zhenhua Stamping has more than 30 years of experience in precision metal stamping and fastener production. All products comply with ISO, DIN, and ASME international standards, adopting high-quality 304/316 stainless steel and high-strength carbon steel materials, with professional anti-corrosion surface treatment. The full series is highly compatible with various harsh infrastructure scenarios in Indonesia. 2.1 Anti-Lock Washers Series — Vibration Resistance & Structural Stability Recommended for bridges, railway transit, mechanical equipment, and high-vibration steel structures. Zhenhua’s DIN6798 A-type and J-type inner serrated lock washers, double-tooth anti-loosening washers feature precise dimensional tolerance and perfect fitting with bolts. The special tooth surface structure greatly enhances friction, effectively preventing bolt loosening caused by long-term mechanical vibration. Stainless steel materials and professional surface treatment achieve excellent salt spray resistance, adapting to Indonesia’s humid and corrosive environment. 2.2 Self-Locking Fastener Nuts Series — Heavy-Duty Locking & Anti-Dropping Suitable for photovoltaic support systems, outdoor steel structures, and large engineering equipment fixation. Zhenhua DIN7967 self-locking fastening nuts adopt professional one-piece locking structure, which realizes automatic tightening and anti-loosening without auxiliary tools. The Dacromet coating supports more than 500 hours of salt spray testing, effectively resisting outdoor high temperature aging and coastal salt fog erosion. It solves the hidden danger of nut falling off in extreme weather and long-term vibration scenarios. 2.3 High-Strength Bolt & Nut Series — Load-Bearing & Engineering Safety Ideal for high-rise buildings, bridge main structures, port engineering, and equipment foundation anchoring. Zhenhua provides Grade 8.8/10.9 high-strength hexagonal bolts, flange bolts, U-bolts, and anchor bolts. With high tensile strength and strong structural bearing capacity, these products meet the load requirements of main engineering structures. Stainless steel and hot-dip galvanized treatments greatly improve corrosion resistance, perfectly adapting to coastal high-salt working conditions and ensuring long-term structural bearing stability. 2.4 Belleville & Non-Slip Washers Series — Precision Connection & Shock Absorption Applied for steel structure assembly, equipment shock absorption, and precision engineering connection. Zhenhua’s NF E25-5111 standard Belleville washers have stable elastic compression performance, which can continuously provide pre-tightening force to compensate for connection gaps caused by thermal expansion and contraction. Non-slip embossed washers effectively prevent component displacement and slipping, improving the overall sealing and stability of engineering connections. 3. Scenario-Based Product Matching for Indonesian Infrastructure For steel structure buildings and urban high-rises, Zhenhua recommends high-strength stainless steel bolts matched with serrated lock washers to achieve high load-bearing and salt spray corrosion resistance. For bridges and railway transit projects, self-locking nuts and special vibration-proof washers are the best choice to avoid long-term vibration loosening and reduce later maintenance costs. For outdoor photovoltaic power stations, anti-drop self-locking fasteners and 304 anti-rust washers can resist high temperature aging and coastal erosion. For port and marine projects, 316 stainless steel fasteners are adopted for ultimate anti-corrosion performance to adapt to humid marine environments. 4. Why Choose Zhenhua Stamping for Indonesia Infrastructure? Stable infrastructure quality depends on reliable hardware fastener support. As a professional Chinese fastener manufacturer focusing on the Southeast Asian market, Zhenhua Stamping owns automated production lines, strict ISO quality control systems, and professional mold R&D capabilities. It supports standard product mass supply and non-standard customized processing, with stable delivery cycle and excellent cost performance. All products are tailored for Indonesia’s tropical harsh environment, effectively improving infrastructure safety factor and service life. Moving forward, Zhenhua will continue to provide high-quality precision stamping fastener solutions for Indonesia’s infrastructure upgrading and industrial construction, becoming a long-term reliable strategic partner for local engineering projects.

As the largest economic powerhouse in Southeast Asia, Indonesia is undergoing rapid industrial expansion, large-scale infrastructure upgrading, and comprehensive manufacturing transformation. From the construction of the new capital Nusantara and the advancement of 44 national industrial zones to the booming development of new energy vehicles, photovoltaic energy, mechanical equipment, and urban infrastructure, every stage of Indonesia’s industrial modernization requires stable, high-precision, and durable hardware parts and fasteners. In this continuous industrial upgrading process, high-quality stamped components and industrial fasteners manufactured by Ningbo Yinzhou Zhenhua Stamping Co., Ltd. have become an indispensable foundational support for Indonesia’s industrial system. Indonesia’s fast-growing manufacturing and construction sectors have created a massive and long-term demand for industrial hardware parts. In recent years, Indonesia’s manufacturing PMI has maintained a continuous expansion trend, with steady growth in infrastructure investment, automotive manufacturing, and new energy projects. As local industrial chains continue to improve, the demand for high-standard precision stamping parts, locking fasteners, and metal connection components has increased significantly. However, restricted by local manufacturing technology and capacity constraints, Indonesia still relies heavily on imported high-end industrial hardware. More than 70% of high-precision fasteners and complex stamping components required for high-end manufacturing depend on foreign suppliers, making imported Chinese hardware components a core guarantee for Indonesia’s industrial stability and progress. Against this market backdrop, Ningbo Yinzhou Zhenhua Stamping has long been deeply integrated into Indonesia’s industrial supply chain. With over 30 years of professional experience in precision metal stamping and fastener production, the company has formed mature manufacturing systems, strict quality control standards, and flexible customized production capabilities. Zhenhua Stamping specializes in stainless steel, carbon steel, and spring steel stamping processing, producing a full range of industrial lock washers, anti-loosening fasteners, precision stamping parts, and non-standard hardware components that are widely applicable in automotive assembly, photovoltaic support systems, mechanical equipment, engineering construction, and marine environmental projects. The company owns complete automated production lines, high-precision stamping equipment, and a professional mold R&D team, enabling rapid mold development, high-precision processing, and large-scale stable production. All products comply with ISO, DIN, and ASME international industrial standards. With excellent salt spray resistance, high structural stability, and strong environmental adaptability, Zhenhua’s hardware parts are perfectly suited for Indonesia’s high-temperature, high-humidity, and coastal salt fog working environments, effectively solving the problems of insufficient precision, poor durability, and short service life of local low-end hardware products. From urban infrastructure construction and industrial park equipment supporting to new energy vehicle production and photovoltaic project installation, Zhenhua’s precision hardware components have been widely used in core industrial scenarios across Indonesia. By providing reliable connection and structural protection for industrial equipment and engineering facilities, these high-quality stamping parts and fasteners ensure the safety, stability, and long-term operation of various industrial projects, strongly supporting the continuous iteration and upgrading of Indonesia’s manufacturing industry. As Indonesia accelerates its industrial localization and supply chain optimization, the demand for high-quality, standardized, and customizable industrial hardware will continue to grow. Ningbo Yinzhou Zhenhua Stamping will continue to rely on its mature manufacturing advantages, stable product quality, and professional customized services to continuously empower Indonesia’s industrial development. By participating in the 2026 Jakarta International Industrial Equipment and Components Exhibition from June 3 to June 6, Zhenhua will further deepen local market cooperation, deliver more high-quality Chinese-made hardware stamping components to Southeast Asia, and become a long-term reliable strategic supplier for Indonesia’s industrial modernization.

With 30+ years of expertise in fastener manufacturing, Zhenhua Stamping has been a benchmark Chinese manufacturer since its founding in 1993. The company focuses on R&D, production, and export of premium fasteners and precision stampings, with over 50% of products exported to Europe, America, and Southeast Asia. It has long served global giants such as Volkswagen, General Motors, and Alcatel-Lucent, with quality certified to major international standards. The factory is equipped with 120 precision presses (≤250 tons), 10 fully automated stamping lines, 3 shearing machines, and 2 backup generator sets. This enables full-process in-house control—from raw material cutting and precision stamping to surface treatment and packaging—ensuring consistent quality in mass production. The core technical team includes 11 senior mold engineers, skilled in complex forming and custom solutions for materials like stainless steel (304/316), carbon steel, and spring steel (C100S/65Mn). Mold development takes only 3–7 days, enabling rapid response to bespoke requirements. Products comply strictly with DIN, ASME, and ISO 9001 standards, covering lock washers, lock nuts, disc springs, PV-specific fasteners, and more. Dacromet-coated parts achieve 500+ hours of salt spray resistance, ideal for extreme conditions. As Southeast Asia’s largest economy, Indonesia is undergoing rapid industrialization and infrastructure expansion. Its manufacturing PMI has remained above the expansion threshold for 31 consecutive months, driven by booming automotive, construction, machinery, and new energy sectors—fueling strong demand for fasteners. The Indonesian fastener market grows at 6%–8% annually, yet local production capacity is severely insufficient, with over 70% of supply relying on imports. In 2023, Indonesia imported USD 150 million worth (66,000 tons) of fasteners from China, making China one of its largest suppliers. With the development of 44 national industrial zones, the rollout of new energy vehicle supply chains, and large-scale infrastructure projects, Indonesia’s dependence on high-strength, corrosion-resistant, high-precision fasteners will only intensify—creating significant opportunities for quality Chinese manufacturers. Zhenhua Stamping’s participation aims to deepen engagement with Indonesian and Southeast Asian buyers, leveraging four core strengths: automated production, strict quality control, rapid customization, and reliable delivery. The company will highlight flagship products including stainless steel anti-loosening assemblies, PV mounting fasteners, and automotive precision stampings. On-site services will include technical consulting, sample testing, and custom solution design, helping customers address assembly reliability and cost-efficiency challenges. A Zhenhua Stamping executive stated: “Indonesia is the core engine of Southeast Asian industrial growth and a key market for our global expansion. With 30 years of technical expertise and integrated manufacturing capabilities, we are confident in meeting Indonesia’s urgent demand for high-end fasteners through high quality, short lead times, and strong adaptability. We aim to strengthen China–Indonesia industrial supply chain cooperation and achieve win–win development.”

Ningbo Zhenhua Stamping Parts, with over three decades of experience in cold stamping (founded in 1993), is a professional fastener manufacturer integrating R&D, production, and export. More than 40% of its products are exported to Europe and America, and it has passed the ISO9001 quality system certification. It has long provided stamping solutions for international enterprises such as Volkswagen and General Motors. The NFE25-511 French rolled thread conical spring washer series, with its meticulous French standard craftsmanship and outstanding anti-loosening performance, has become a benchmark product in the industrial fastening field, perfectly solving the problem of bolt loosening in vibration and shock environments.   I. Product Details and Specifications NFE25-511 (French standard NF E25-511-1984) is a toothed rolled thread conical spring lock washer (CS series), a high-precision stamping part, and a high-performance anti-loosening fastener that replaces ordinary flat washers and toothed lock washers. Ningbo Zhenhua strictly follows the French standard for production, covering all specifications from M3 to M20, with core parameters precisely matching the standard: Material: High-quality 65Mn spring steel, carbon steel, alloy steel (customer selectable) Process: Precision stamping + quenching and tempering heat treatment, hardness reaches HRC42-45 Surface treatment: Yellow zinc plating (Yellow Zinc Plated), Dacromet, zinc-nickel alloy (optional) Structure: Single-sided straight thread rolled + conical disc spring design, inner and outer diameters, thickness, and number of teeth fully comply with the NFE25-511 standard   II. Core Product Features Compliance with French standards: 100% adherence to NF E25-511 standards, with strict dimensional tolerances, perfect compatibility with metric bolts/nuts, and strong interchangeability. Dual anti-loosening effect of rolled thread and conical spring: The conical structure provides continuous elastic preload, and the single-sided straight thread rolled surface is embedded in the contact surface, providing dual locking, with an anti-loosening coefficient far exceeding that of ordinary toothed lock washers and wedge lock washers. High strength and durability: Spring steel material + precise heat treatment, resistant to fatigue and compression deformation, with stable performance in repeated assembly and disassembly. Yellow zinc plating protection: Uniform and bright coating, salt spray test for 48-72 hours, anti-rust and corrosion-resistant, suitable for indoor and outdoor as well as moderately harsh environments. Convenient installation: No special tools required, compatible with standard bolts, and can be used with self-locking nuts and safety washers to enhance overall locking effect.   III. Core Product Advantages Superior anti-loosening performance compared to traditional parts: Compared to flat washers, the preload retention rate increases by 80%; compared to ordinary toothed lock washers, the anti-vibration and anti-shock ability increases by 50%, completely solving the problem of bolt loosening caused by vibration. Dual guarantee of material and process: Select high-elasticity steel, produced on an automatic stamping line, free of burrs and cracks, with consistency superior to the industry average. Cost-effective and durable: Yellow zinc plating provides long-term rust protection, extending the service life by three times, reducing maintenance frequency, and lowering equipment repair costs. Wide compatibility and strong adaptability: Covers all specifications, can be customized for non-standard sizes, and is suitable for various electrical cabinets, machinery, automotive, and rail transit scenarios. Safe, reliable, and compliant: Meets EU ROHS standards, passes high-strength and anti-loosening performance tests, suitable for critical safety connection parts.   IV. Diverse Application Scenarios Electrical equipment and control cabinets: As a dedicated electrical cabinet washer, it is used for the connection of terminals and panels in switch cabinets, frequency converters, and distribution boxes, resisting equipment operation vibration and preventing short circuits and power outages caused by loose connections, ensuring electrical safety. Automotive manufacturing and maintenance: Applied to engine mounts, chassis suspensions, and transmission bolts, resisting vehicle vibration and temperature fluctuations, avoiding loose fasteners causing abnormal noises and failures, and enhancing overall vehicle safety. Industrial machinery and heavy equipment: Compatible with motors, pumps, conveyors, gearboxes, and machine tools, capable of withstanding continuous heavy loads and high-frequency vibrations, maintaining bolt preload, reducing downtime for maintenance, and extending equipment life. Railway transportation and construction machinery are used in high-speed rail and metro equipment, excavators, cranes, etc. They can withstand strong vibration, shock and outdoor corrosion, ensuring stable structural connections and eliminating potential safety hazards. Building and steel structures are applied in steel structure nodes, scaffolding, curtain wall connectors, etc. They can resist wind vibration and displacement, ensuring the tightness and reliability of building structures.   V. User Pain Point Resolution Cases Case 1: Electrical Cabinet Wiring Loosening Fault At a certain electrical equipment factory, the control cabinet's terminal bolts loosened due to fan vibration, causing an average of 5 faults per month and a high repair rate. Solution: Replaced with Ningbo Zhenhua NFE25-511 yellow zinc-plated washers. Effect: The double locking of knurling and conical spring reduced the wiring loosening faults to zero, reduced the repair cost by 90%, and significantly improved customer satisfaction.   Case 2: Abnormal Noise from Automobile Chassis Fasteners At a certain auto parts factory, the chassis bolts used ordinary flat washers, which loosened after road tests, causing abnormal noise and after-sales complaints. Solution: Replaced with NFE25-511 washers and self-locking nuts. Effect: The pre-tightening force was stable and long-lasting, reducing the loosening rate by 95%, reducing after-sales complaints by 80%, and successfully passing the quality audit of the car manufacturer.   Case 3: Frequent Tightening of Industrial Conveyor Bolts At a certain food factory's conveyor, the frame bolts used ordinary washers and needed to be tightened weekly, causing production disruptions due to machine shutdowns. Solution: Replaced all with Zhenhua NFE25-511 washers. Effect: No need for weekly tightening, maintenance time reduced by 80%, no machine shutdowns due to loosening, and an annual efficiency increase of over 500,000 yuan.   Ningbo Zhenhua Stamping Parts, with over 30 years of stamping craftsmanship, has created the NFE25-511 French anti-loosening washer. From standard parts to non-standard customization, from material to process, every detail showcases professional quality. It provides stable, reliable, and efficient fastening solutions for global industrial customers, helping enterprises solve loosening problems and build a solid safety line for equipment.

1.Why do your industrial equipment always malfunction at critical moments? In the industrial production process, have you ever encountered these headache-inducing scenarios:The motor bolts on the automated production line frequently loosen, causing equipment downtime and production capacity interruption;The fasteners on the car chassis loosen due to road impact, posing safety hazards;The outdoor electrical equipment experiences poor contact at the wiring terminals due to vibration, leading to short circuits and abnormal noises;The bolts of the door mechanism in rail transit loosen, significantly increasing maintenance costs and safety risks.Traditional flat washers and ordinary spring washers are no longer capable of coping with the complex working conditions of high vibration and strong impact. The DIN 6798J internal serrated lock washers produced by Zhenhua are precisely the high-performance German standard fasteners designed to address these industry pain points.   2.Then what is DIN 6798J internal serrated locking washer? DIN 6798J is an internal serrated locking washer defined by German industrial standard, which is specially designed for bolt/nut connection. The serrated teeth evenly distributed in the inner ring bite the end face of the bolt and the surface of the connected piece to achieve double locking effect, and it is recognized as an efficient anti-loosening solution in the industrial field. Our DIN 6798J washer strictly follows the German standard, covers the whole series of specifications of M2-M30, and is made of 304/316 stainless steel, 65Mn spring steel and other materials, which is suitable for all kinds of fastening scenes from light industry to heavy industry.   3.The four core advantages of DIN 6798J produced by Zhenhua redefine the industry standard. Tooth bite, the multidirectional serrations of the powerful anti-loosening inner ring are embedded into the end face of the bolt and the surface of the workpiece during the tightening process, forming a double locking mechanism of "mechanical bite+friction resistance", which can effectively resist the connection looseness caused by vibration, impact and temperature alternation, and the anti-loosening effect is far superior to that of ordinary spring washers. Multi-material adaptation, full scene coverage 304/316 stainless steel: rust-proof and corrosion-resistant, suitable for harsh environments such as humidity, acid and alkali (such as outdoor equipment and marine engineering); 65Mn spring steel: high elasticity, anti-fatigue, and can withstand repeated impact loads (such as automobiles and rail transit); Zhenhua supports customized surface treatment (such as zinc plating, dacromet, etc.) to meet the application needs of customers in special anti-corrosion and conductivity. Compatible with general use, the installation of zero threshold is completely suitable for multi-system standard bolts/nuts such as German standard and national standard, and there is no need to modify the design or replace fasteners; It is installed synchronously with bolts, without special tools and occupying additional assembly space, which is perfectly suitable for automatic assembly line. German standard process, stable quality, high standard stamping process, and strict control of dimensional tolerance within the German standard range; Each batch has been tested for hardness, elasticity and anti-looseness, so as to ensure stable performance under long-term working conditions and prevent early failure. 4.Applicable industries and scenarios Industrial automation: motor, transmission mechanism, robot joint, automatic production line equipment; Automobile and transportation: chassis, engine, doors, seats, rail transit vehicle fasteners; Electricity and energy: photovoltaic inverter, distribution cabinet, terminal, outdoor electrical equipment; General machinery: pump valves, fans, compressors, construction machinery, agricultural machinery; Ocean and outdoor: marine equipment, port machinery, outdoor billboards, photovoltaic supports.   5.Why choose Zhenhua's DIN 6798J washer? Full-specification spot: M2-M30 full-range specification standing stock, supporting mass customization and fast delivery; Quality assurance: passed ISO 9001 quality system certification, and provided material report and performance test report for each batch; Technical support: provide free suggestions on the selection of locking schemes, and recommend suitable materials and specifications according to customers' working conditions; One-stop service: support the matching supply with bolts and nuts, and reduce the procurement cost and management cost of customers.