- Ningbo Zhongli bolts manufacturing Co., Ltd. +86-574-86587617
- tan@nbzyl.com
Leave Your Message
Industry-leading DIN127 spring washers and DIN125 flat washers engineered for superior vibration resistance and reliable mechanical assembly performance.
A spring washer — most commonly produced to the DIN127 standard — is a split, helical ring made from hardened steel that provides a controlled axial load when compressed under a bolt or nut. Unlike flat washers, the spring washer's inherent elasticity creates continuous tension that compensates for thermal expansion, vibration-induced loosening, and material relaxation over time. This makes it an indispensable component in virtually every sector of modern mechanical assembly.
In high-vibration environments — such as automotive drivetrains, industrial machinery, and structural steel connections — bolted joints without spring washers can lose up to 30% of their clamping force within the first 10,000 vibration cycles. DIN127 spring washers restore and maintain joint integrity, reducing maintenance costs and preventing catastrophic failures.
The global fastener market, valued at over USD 95 billion in 2023, continues to expand at a CAGR of approximately 4.5% through 2030, driven by booming construction activity, automotive electrification, and renewable energy infrastructure. Spring washers represent a significant and growing sub-segment, with demand accelerating particularly in Asia-Pacific and North America.
China remains the world's dominant manufacturer of spring washers, accounting for more than 60% of global production volume. Ningbo, located in Zhejiang Province, has emerged as one of China's premier fastener manufacturing hubs, with companies like Ningbo Zhongli Bolts Manufacturing Co., Ltd. supplying DIN127 spring washers to customers across Europe, the USA, the Middle East, Africa, and Southeast Asia.
Key commercial trends shaping the spring washer market include: rising demand for high-strength variants (Grade 10.9 / 12.9 compatible), increased adoption of hot-dip galvanized surface treatments for corrosion resistance in outdoor and marine applications, and growing procurement of black oxide finished washers for aesthetic and mild corrosion protection in machinery and automotive assembly.
Spring washers serve as critical anti-loosening components across a wide range of industrial sectors. Below is an in-depth look at where DIN127 spring washers deliver the greatest value in mechanical assembly.
In steel frame construction and bridge engineering, spring washers are used alongside high-strength hex bolts (ASTM A325, EN14399) to maintain bolt preload under dynamic wind and seismic loads. DIN127 spring washers combined with DIN125 flat washers form the standard assembly for structural connections in Europe and Asia.
From engine mounts and suspension systems to battery pack enclosures in electric vehicles, spring washers prevent joint loosening caused by constant vibration and thermal cycling. The transition to EVs has increased demand for precision-grade, lightweight spring washers compatible with aluminium and composite assemblies.
Wind turbine tower assemblies and solar panel mounting systems rely heavily on spring washers to maintain bolted connections exposed to continuous dynamic loading and outdoor weathering. Hot-dip galvanized DIN127 spring washers are the preferred choice for these corrosion-intensive environments.
Compressors, pumps, gearboxes, and conveyor systems operate under high-frequency vibration. Spring washers in these assemblies prevent fastener loosening that could otherwise lead to unplanned downtime. High-strength spring washers (Grade 12.9 compatible) are specified for critical joint applications in mining and oil & gas equipment.
Saltwater exposure demands superior corrosion protection. Hot-dip galvanized and stainless-grade spring washers are used in shipbuilding, offshore platforms, and port infrastructure where fastener integrity is safety-critical. Zhongli's HDG surface treatment meets ISO 1461 standards for marine-grade protection.
Rail track fastening systems, rolling stock assembly, and bridge connections use spring washers to absorb the constant vibration generated by train operations. DIN127 spring washers are specified in European railway standards for their proven anti-loosening performance in high-cycle fatigue conditions.
Next-generation spring washers are being developed using advanced high-strength steel alloys and titanium composites to meet the weight reduction demands of aerospace, EV, and precision engineering applications without sacrificing clamping performance.
Innovations in surface treatment — including Geomet®, Dacromet, and nano-ceramic coatings — are extending the service life of spring washers in aggressive environments, replacing traditional zinc plating in sectors demanding RoHS and REACH compliance.
Fully automated cold-heading and heat-treatment lines, combined with AI-driven quality inspection systems, are enabling manufacturers to achieve tighter dimensional tolerances (±0.01mm) and 100% defect detection, meeting the exacting requirements of automotive and aerospace OEMs.
Leading spring washer manufacturers are investing in energy-efficient furnaces, closed-loop water treatment systems, and recyclable packaging to meet the sustainability procurement criteria of global Tier-1 customers and comply with international environmental regulations.
Growing demand for application-specific spring washers — including oversized, serrated, and wave-form variants — is driving manufacturers to offer flexible customisation services. Zhongli supports non-standard spring washer production from M10 to M48 diameters with unlimited length options.
E-commerce platforms and digital B2B procurement channels are transforming how spring washers reach end-users globally. Manufacturers with established export networks and fast-response logistics — like Zhongli's multi-province sales branches — are gaining competitive advantage in international markets.
Founded in 2003, Ningbo Zhongli Bolts Manufacturing Co., Ltd. is a professional manufacturer of high-strength fasteners — including DIN127 spring washers, DIN125 flat washers, and a comprehensive range of structural bolts — covering an area of approximately 10,000 square meters with a registered capital of RMB 1,500,000.
With a total annual productivity of 8,000 tons per year, the company has established sales branches across multiple Chinese provinces and exports to Europe, the USA, the Middle East, Africa, Southeast Asia, and beyond. Through ISO9001-certified quality management and fully automated multi-station cold and hot heading equipment, Zhongli delivers reliable, precision-engineered fasteners to customers worldwide.
Read More About UsOur main products ZYL brand fasteners include structural hex bolts ASTM A325 type 1, A490, hex head bolts DIN931, DIN933, EN14399, DIN6914, ISO4014, ISO4017 Gr8.8 Gr10.9 Gr12.9, ANSI B18.2.1 UNC and UNF Gr5, Gr8, fine pitch hex bolts DIN960, DIN961 Gr8.8 Gr10.9 Gr12.9, hex socket cap screws DIN912, ISO4762 Gr8.8 Gr10.9 Gr12.9 with surface Black, Zinc plated, Hot dip galvanized. Diameters from M10 to M48, length no limited. Hex Flange bolts DIN6921 Gr8.8 Gr10.9 with serration, thread rod A193 B7 long sizes and short sizes with 2H nuts, stud bolts. We also can supply hex nuts DIN934, DIN6915, plain washers DIN125, DIN126, DIN6916, spring washers DIN127 with Black, Zinc plated and Hot dip galvanized surface.
Our physical and mechanical test results can reach to ISO898-1 for bolts and ISO898-2 for nuts.
Through scientific management, Ningbo Zhongli Bolts Manufacturing Co., Ltd. obtained ISO9001 certificate of Quality Management System. Quality is the most important for us. We have strict production and inspection equipments to support this point.
We hope to establish business relationship with all over the world, and our business can bring in mutual benefits for both parties.
A Professional Sales and Technical Team with More Than 20 Years History.
We Have Our Own Testing Equipment and Laboratory, with Initial, Patrol, and Final Inspection.
Our Factory Has Its Own Cold Forged, Hot Forged, And Heat Treatment Equipment.
Standard Fasteners in Stock, Non-standard Fasteners Can Be Customized.
We Have Passed ISO 9001, EN 15048, EN 14399, AD2000 and CE Certificates.
We hope to establish business relationships with partners all over the world, and our business can bring mutual benefits for both parties.
EN 15048 CE Certification, EN14399 CE Certification, ISO9001 Certificate
Grasp first-hand information from our global partners and customers.
Explore our complete range of DIN127 spring washers and DIN125 flat washers available in zinc plated, black oxide, and hot-dip galvanized finishes for all mechanical assembly needs.
Contact Ningbo Zhongli Bolts Manufacturing Co., Ltd. today for competitive pricing, free samples, and expert technical support. We supply DIN127 spring washers and complete fastener solutions to customers in 50+ countries worldwide.
Get In Touch With Us
Send Email