Serrated Lock Washers are specialized washers featuring radial teeth or serrations on one or both faces, designed to grip mating surfaces and prevent bolt/nut loosening due to vibration, thermal expansion, or dynamic loads. Available in carbon steel (zinc-plated), stainless steel (304/316), or spring steel, they provide reliable locking performance in machinery, automotive, and industrial applications.
- Material:
- Carbon Steel: Grade 1008 (zinc-plated, yellow/clear) for general use.
- Stainless Steel: 304 (A2) for corrosion resistance; 316 (A4) for harsh environments.
- Spring Steel: 65Mn (heat-treated) for high elasticity and durability.
- Size Range:
- Metric: M3–M36 (ISO 7091, GB/T 956.1).
- Imperial: #4–1-1/2" (UNC/UNF, ASME B18.21.1).
- Design Types:
- External Serrated: Teeth on the outer edge (grip surface).
- Internal Serrated: Teeth on the inner edge (grip bolt/nut).
- Double Serrated: Teeth on both faces for maximum friction.
- Key Dimensions:
- Outer Diameter (OD): 1.5×–2× bolt diameter (e.g., M8 washer: OD ≈ 16 mm).
- Thickness: 0.5–3 mm (varies by size and serration depth).
- Finish: Zinc plating (RoHS/REACH), passivated (stainless steel), or black oxide.
- Standard Carbon Steel/Zinc-Plated (M4–M16): 10,000 pieces (in-stock sizes).
- Stainless Steel (304/316): 5,000 pieces (custom serration angles available).
- Spring Steel: 2,000 pieces (engineered for high-tension applications).
Factory Advantages: ISO 9001-certified production, precision stamping for uniform serration spacing, and support for custom serration patterns (e.g., fine/coarse teeth) with lead times of 7–15 days.
- Automotive: Engine components (valve covers, intake manifolds), suspension parts, and exhaust systems.
- Industrial Machinery: Vibrating equipment (conveyors, pumps), agricultural machinery, and heavy-duty tools.
- Aerospace/Defense: High-reliability applications requiring anti-loosening without additional locknuts.
- Electronics: Securing panels and enclosures in high-vibration environments (e.g., aerospace electronics).
- Anti-Loosening Mechanism:
- Serrations bite into metal surfaces, creating friction to resist rotational movement.
- Double serrated designs provide dual-directional grip for maximum stability.
- Corrosion Resistance:
- 316 stainless steel: 1,000+ hours salt spray test (ASTM B117).
- Zinc-plated carbon steel: 500+ hours salt spray for indoor/outdoor use.
- Temperature Resistance: Suitable for -40°C to +200°C (carbon steel); -60°C to +300°C (stainless steel).
- Material Grades: 420 SS (martensitic, high hardness) or 2205 duplex SS for extreme loads.
- Special Coatings: PTFE (anti-seize), Dacromet (2,000+ hours salt spray), or thermal barrier coatings.
- Bespoke Designs: Non-standard OD/ID ratios, countersunk serrated washers, or serrations with radial angles (e.g., 60° vs. standard 90°).
- Testing Compliance: Certified to ASME B18.21.1 (USA) and DIN 6798 (Europe) for locking performance.
- Cost Efficiency: Eliminates the need for locknuts or adhesives in many applications.
- Sustainability: Recyclable steel options and eco-friendly plating processes.
Contact Us
Request a quote for serrated lock washers tailored to your vibration resistance needs! Factory-direct supply ensures reliable performance in automotive, industrial, and aerospace projects. Bulk discounts available for orders over 20,000 pieces.
