S-91812A954 3.11" ID x 4.33" OD Extreme-Vibration-Resistant Wedge Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through the wedge lock design and dual-sided serrations, preventing fastener loosening in high-stress environments.
• Exceptional corrosion resistance with 316 Stainless Steel construction, ideal for harsh or outdoor industrial settings.
• Enhanced durability and wear resistance due to case hardening achieving a Rockwell C51 hardness, extending the washer's service life.
• Broad compatibility with both inch (3") and metric (M76) screw sizes, offering flexibility for various global applications.
• Reliable locking performance from top and bottom serrations that bite into mating surfaces, ensuring a secure, non-slip fit.
• Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safe and sustainable use in regulated industries.
• Precision dimensional fit with an ID of 3.11" and OD of 4.33", providing optimal load distribution and stability.

Professional Applications & Engineering Value

This 316 Stainless Steel Wedge Lock Washer is engineered to solve critical challenges in heavy machinery, construction, and marine applications where vibration-induced fastener failure is a common issue. The top and bottom serrations create a powerful locking action by embedding into both the bolt/nut and the workpiece, effectively resisting rotational forces. Made from 316 stainless steel, it offers excellent resistance to corrosion from chemicals, saltwater, and extreme weather, making it suitable for offshore, chemical processing, and infrastructure projects. The case hardened surface treatment to Rockwell C51 hardness ensures the serrations maintain their bite and the washer withstands repeated loading without deformation. This combination of material and design delivers reliable, long-term vibration resistance, reducing maintenance needs and enhancing safety in demanding industrial applications.

Specification Summary & Compliance

This washer features precise dimensions: Inside Diameter (ID) of 3.11", Outside Diameter (OD) of 4.33", and Thickness between 0.340-0.360". It is designed for use with 3" screw size or M76 in metric, and manufactured with case hardened treatment to achieve a hardness of Rockwell C51. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring it meets stringent environmental and safety regulations for hazardous substances.