In modern industrial assembly, vibration is the constant enemy of structural integrity. Toothed lock washers (complying with DIN 6797 and DIN 6798 standards) are specifically engineered mechanical components designed to prevent critical self-loosening of threaded fasteners. By utilizing spring tension coupled with unique internal or external teeth, these specialized washers bite into the mating surface of both the bolt head/nut and the host material.
Under heavy dynamic loading, thermal expansion, or mechanical vibration, standard flat washers allow rotational loosening. Toothed configurations prevent this failure mode. The teeth undergo torsional deformation, generating a constant reactive axial force that keeps the joint preloaded. Globally, these components are highly utilized in safety-critical assemblies across energy grids, heavy automotive drivetrains, and consumer electrical enclosures.
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At Sinsun Hardware, established in 2006, we combine German-imported multi-station cold heading machinery with Taiwanese precision technology to produce high-performance industrial fasteners. While our massive capacity includes a wide range of screws, nails, and rivets, our specialized stamping and heat treatment lines allow us to produce high-grade OEM toothed lock washers with strict geometric tolerances.
We work directly with engineering teams to configure specialized tooth configurations, dimensional footprints, and custom mechanical behaviors. Whether you require standard carbon steel, spring steel (like 65Mn), or premium stainless steel (SUS304/SUS316), Sinsun delivers fasteners with exceptional finish accuracy (Ra ≤ 0.4μm), high strength limits (up to 1,000+ MPa), and optimized hardness ratings (HRC 40-50 for spring washers).
Purchasing directly from Northern China's leading fastener hub allows global OEMs to access unmatched economies of scale without compromising on quality or regulatory compliance.
Core steel is sourced directly from Ansteel and Xingtai Steel. Spheroidizing annealing and wire drawing are conducted in-house to guarantee consistent microstructure.
Four in-house continuous heat treatment lines process up to 20 tons daily, maintaining precise tempering times to prevent hydrogen embrittlement and achieve target hardness.
Our 12,000 sqm automated warehouse accommodates over 18,000 pallet positions, facilitating 24/7 scanning, automated sorting (3,000+ cartons/hour), and secure loading.
Located near key northern shipping terminals, Sinsun handles custom documentation and manages cargo dispatch, shipping over 8,500 containers annually.
Toothed lock washers are key components across a variety of demanding industrial sectors:
Depending on the mating surfaces, engineers specify Internal Toothed Washers (DIN 6797J / DIN 6798J) for smaller bolt heads and electrical contact points, or External Toothed Washers (DIN 6797A / DIN 6798A) to distribute retention forces over larger surface areas.
We manufacture toothed lock washers in strict alignment with major global standard directories.
| Standard | Type / Description | Sizing Range | Materials Available | Typical Coatings |
|---|---|---|---|---|
| DIN 6797 Form A | External Toothed Lock Washers | M2 - M30 | Carbon Steel, Spring Steel 65Mn, Stainless (A2/A4) | Zinc Plating, Mechanical Galvanizing, Dacromet |
| DIN 6797 Form J | Internal Toothed Lock Washers | M2 - M30 | Carbon Steel, Spring Steel 65Mn, Stainless (A2/A4) | Zinc Plating, Mechanical Galvanizing, Phosphate |
| DIN 6798 Form A | Serrated External Lock Washers | M2 - M30 | Spring Steel, SUS304, SUS316 | Zinc Plating, Yellow Zinc, Geomet, Dacromet |
| DIN 6798 Form J | Serrated Internal Lock Washers | M2 - M30 | Spring Steel, SUS304, SUS316 | Zinc Plating, Phosphating, Passivation |
| ASME B18.21.1 | Tooth Lock Washers (US Standard) | #2 to 1-1/2 inches | Carbon Steel, Silicon Bronze, Stainless Steel | Zinc, Cadmium, Black Oxide, Plain |
Our structured workflow ensures quality control and dynamic lead-time management for our international partners.
We analyze your application challenges, environment conditions (corrosion, temperature, fatigue), and torque parameters to select the optimal material and design.
Our technical team reviews drawings, creates detailed 3D design models, and produces rapid pre-production samples for physical laboratory testing.
Using our German and Taiwanese stamping machinery, we run high-speed production lines with continuous SPC (Statistical Process Control) monitoring.
Washers undergo thermal processing to achieve specified hardness, followed by advanced coating processes (such as Dacromet or Mechanical Zinc Plating).
We perform dimensional verification, salt spray tests, hardness mapping, and torque-tension analysis, providing comprehensive material certificates.
Orders are packed in customized boxes, palletized, and loaded in our 12,000 sqm warehouse, ensuring secure transit to global ports.
Discover how Sinsun Hardware solves engineering and supply chain challenges for global industrial companies.
Get answers to common technical, manufacturing, and logistics questions about Sinsun toothed lock washers.
DIN 6797 features flat teeth (overlapping structure), which provide locking force on standard flat mating surfaces. DIN 6798 features twisted/serrated teeth, providing a higher spring effect and stronger bite, making them ideal for assemblies subject to high vibration.
We implement a strict baking cycle (typically 200°C for 4–8 hours depending on dimensions) immediately after electroplating. This process releases trapped atomic hydrogen from the steel microstructure, preserving tensile strength.
For standard sizes in carbon/spring steel, our MOQs are highly flexible, starting around 100,000 pieces per run. For custom materials or highly complex OEM dimensions, please contact our engineering team to discuss feasibility.
Yes. We offer a variety of surface treatments, including zinc plating, yellow passivation, mechanical galvanizing, phosphating, Dacromet, and Geomet coatings, achieving over 1,000 hours of salt spray resistance for marine applications.
Absolutely. Every production run is backed by material certificates detailing heat numbers, chemical composition (C, Si, Mn, P, S), hardness testing profiles, dimensional reports, and salt spray test results.
Our standard lead time ranges between 4 to 6 weeks. This timeline includes raw wire preparation, stamping, heat treatment, surface plating, and quality control. Firm timelines are provided with every quote.
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