Explore our core selection of certified fasteners, precision engineered to complement structural assemblies and heavy machinery connections worldwide.
Established in 2006, Sinsun Hardware has evolved from a high-capacity startup into Northern China's preeminent fastener production force. Operating from a massive, vertically integrated 30,000 square meter facility, we specialize in high-tensile fasteners, self-tapping screws, and mechanical washers designed to meet structural engineering standards globally.
Our infrastructure includes a 12,000 sqm smart warehousing facility with an 18,000+ pallet capacity, backed by multi-language customer support teams that process over 8,500 shipping containers annually. Sinsun serves key global markets including the Middle East, Southeast Asia, South America, and Russia with certified traceability and performance indicators.
Each fastener batch undergoes 12+ dimensional and physical checks to guarantee precise surface finish (Ra ≤ 0.4μm), outstanding salt spray resistance (exceeding 1,000 hours), minimal dimensional variation (±0.02mm), high tensile strength (1,000+ MPa), and controlled hardness (HRC 28-32 for screws, specialized higher ranges for spring elements).
Understanding how helical spring washers utilize residual tension and mechanical friction to defend assembly integrity in high-vibration systems.
When compressed, the split lock washer behaves as a heavy-duty single-turn helical spring. This stores mechanical potential energy, applying a continuous axial force against the joint to counter thermal expansion and settling.
The trapezoidal cut ends of the split washer act as mechanical teeth. When vibration induces minor joint slip, the split ends bite into the bearing face of the nut or bolt head, locking the fastener against counter-rotation.
By absorbing micro-movements, split lock washers reduce high-frequency stress waves transferred to the bolt threads, safeguarding the structural fatigue limits of high-tensile fastners (e.g., Grade 8.8, 10.9, 12.9).
Combining German multi-station forming machinery and Taiwanese tooling technology with complete raw material control.
At Sinsun, we start control at the chemical level. We partner directly with leading mills such as Xingtai Steel and Ansteel Group to obtain high-performance carbon and spring steels (such as 65Mn, 70#, C1022A). Utilizing over 10,000 tons of raw wire annually, we guarantee metallurgical consistency.
Our raw material undergoes specialized in-house spheroidizing annealing inside computer-controlled, gas-fired furnaces. This optimizes carbide distribution, ensuring the steel obtains maximum formability and zero internal defects prior to drawing. Precise drawing lines pull the wire to exact dimensional tolerances of ±0.01mm.
We deploy over 200 German-imported multi-station cold forming machines, capable of outputting up to 1,200 parts per minute. This equipment ensures uniform geometry and microstructural flow lines, reinforcing the strength at critical stress points.
We operate four continuous-belt atmosphere-controlled heat treatment lines processing up to 20 tons daily. For split lock washers, achieving the correct tempering curve is vital to prevent brittle fracture under compression while maintaining an elastic spring-back index (hardness range controlled to HRC 44-51 depending on specification).
Our 12,000 sqm automated warehouse handles sorting at 3,000 cartons per hour. We support OEM-branded customized packaging, structural layout designs, 3D packaging mockups, and flexible shipping configurations to optimize freight containers.
Manufactured to DIN 127 and ASME B18.21.1 specifications. Customize materials and finishes to meet application requirements.
| Nominal Size (mm) | Inner Diameter (min/max mm) | Outer Diameter (max mm) | Thickness (mm) | Spring Height (min mm) | Yield Load Range (kN) |
|---|---|---|---|---|---|
| M3 | 3.10 - 3.40 | 6.2 | 0.8 | 1.6 | 2.1 - 3.4 |
| M4 | 4.10 - 4.40 | 7.6 | 0.9 | 1.8 | 3.6 - 5.8 |
| M6 | 6.10 - 6.50 | 11.8 | 1.6 | 3.2 | 8.5 - 13.5 |
| M8 | 8.10 - 8.50 | 14.8 | 2.0 | 4.0 | 15.6 - 24.8 |
| M12 | 12.20 - 12.70 | 21.1 | 2.5 | 5.0 | 35.4 - 56.2 |
| M16 | 16.20 - 17.00 | 27.4 | 3.5 | 7.0 | 66.0 - 105.0 |
| M20 | 20.20 - 21.20 | 33.6 | 4.0 | 8.0 | 103.0 - 164.0 |
*Custom dimensions, heavy-duty patterns (DIN 127 Type B flat-end / Type A bent-end), and Imperial sizes (ASME B18.21.1) are available upon request.
Sinsun Hardware supplies certified fastening components designed for critical infrastructure, challenging environments, and mechanical applications.
Providing high-fatigue split lock washers for powertrain assemblies, starter motors, and auxiliary brackets. Our automotive fasteners withstand heavy vibration, high heat cycles, and rapid thermal expansion variations.
Leveraging high-grade duplex stainless steel and thick passivation coatings to resist chloride-induced stress corrosion cracking in offshore drilling equipment and structural marine frames.
Supporting wind turbine tower connections and gearbox assemblies. Washers are treated with Dacromet or Zinc Diffusion coatings to provide over 1,500 hours of salt spray resistance without hydrogen embrittlement risks.
Delivering large-scale carbon steel spring washers for structural beams, crane tracks, and heavy machinery foundations. Engineered to retain joint pretension under high dynamic loading.
At Sinsun Hardware, we eliminate variables. Every raw material heat number is recorded, tracked, and stored within our ERP database. Before any product leaves our facility, our quality assurance laboratory performs exhaustive metallurgical tests:
We comply fully with international standards including ISO 9001, RoHS, REACH, and CE, providing complete EN 10204 3.1 material certificates with every shipment.
Real-world engineering challenges solved through custom material formulations, design adjustments, and coating innovations.
The Challenge: A Tier-1 automotive manufacturer faced joint loosening on an engine accessory bracket due to intense heat cycles and operational vibration.
The Solution: Sinsun redesigned the spring lock washer using a specialized heat-resistant carbon steel alloy, coupled with a precise tempering process to sustain HRC 48 hardness at up to 250°C.
The Result: Passed 2,000-hour continuous vibration testing with zero joint slippage and a 15% reduction in overall connection weight.
The Challenge: Marine engineering applications required large-diameter connection fasteners that could survive constant contact with seawater spray without pitting or rust.
The Solution: We provided custom-sized split lock washers made of duplex stainless steel (SUS316/1.4404) with an electro-polished finish to enhance chromium oxide surface protection.
The Result: Completed four years of offshore operation with zero stress-corrosion failures, extending the planned inspection cycle.
A preview of Sinsun's ongoing research and development into material science and coating technologies.
We are testing micro-alloyed spring steels enriched with Boron and Vanadium. This structure yields higher elasticity limits, allowing washers to be constructed thinner while exerting equivalent axial loads.
Partnering with chemical labs to introduce zinc-flake coatings containing micro-capsules. In the event of surface scratches, the capsules rupture to release protective polymers that prevent corrosion spread.
Developing structural joints where critical washers incorporate piezoelectric thin-films. This allows real-time monitoring of tension changes inside industrial structures and wind turbine towers.
We provide supply chain visibility, optimized packing, and compliance support for international buyers.
Sinsun Hardware utilizes advanced ERP systems to coordinate raw material inventory, scheduling, production checkpoints, and shipping dispatch. This integration reduces production cycle times for customized split lock washers by 20% compared to typical factory setups, maintaining a 99% on-time delivery rate.
High-tensile split washers are vulnerable to hydrogen embrittlement during acid pickling and electroplating. Sinsun manages this risk by utilizing mechanical cleaning methods or incorporating a strict degassing bake (heating at 200°C for a minimum of 4 hours immediately post-plating).
We manage transport documents, certificates of origin, import clearances, and specific packaging standards for ports globally, including customs clearance procedures in North America, South America, Europe, and Asia. Our logistics team secures optimal container loading configurations to prevent movement and damage during shipping.
Technical guidance from Sinsun's engineering team on material properties, installation, and procurement.
Explore our complete product catalog. Sinsun Hardware integrates design, production, and distribution services globally.
Contact Sinsun Hardware's engineering department today to discuss custom sizes, metallurgical standards, surface coating requirements, and wholesale volume discount pricing.
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