S-91812A474 0.51" ID x 0.77" OD Extreme-Vibration-Resistant Wedge Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through dual-sided serrations that bite into mating surfaces, preventing loosening under dynamic loads
• Exceptional corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and chemical exposure
• Enhanced durability and wear resistance from case hardening to Rockwell C51, maintaining locking performance through repeated use
• Precise M12 metric compatibility with 0.51" ID and 0.77" OD dimensions, ensuring perfect fit for standard fastener systems
• Reliable locking performance with wedge lock design that creates continuous tension, eliminating the need for additional locking mechanisms
• Environmental compliance assurance meeting RoHS 3 and REACH standards for safe use in regulated industries
• Optimized thickness range (0.070-0.090") providing consistent compression and surface contact across applications

Professional Applications & Engineering Value

This M12 wedge lock washer delivers critical engineering solutions where vibration-induced fastener failure poses significant operational risks. The 316 stainless steel construction provides superior corrosion resistance compared to standard grades, making it ideal for marine, chemical processing, and food industry applications where moisture and corrosive agents are present. The top and bottom serrated design creates multiple biting edges that mechanically lock against both the fastener and substrate, effectively resisting rotational forces and maintaining clamp load in high-vibration environments. When combined with the case hardened surface achieving Rockwell C51 hardness, these washers maintain their serration sharpness and locking capability through numerous installation cycles. This combination of material excellence and mechanical design ensures reliable performance in heavy machinery, transportation equipment, and structural assemblies where vibration resistant fastening is non-negotiable for safety and operational continuity.

Specification Summary & Compliance

This metric wedge lock washer features precise dimensional specifications including 0.51" inner diameter, 0.77" outer diameter, and thickness ranging from 0.070" to 0.090" for M12 screw applications. Manufactured from 316 stainless steel with case hardening treatment to achieve Rockwell C51 hardness, the washer meets industry standards for locking washers. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for industrial applications across global markets.