S-91812A393 0.15" ID x 0.35" OD Extreme-Vibration-Resistant Wedge Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through dual top and bottom serrations that bite into mating surfaces, preventing loosening under dynamic loads.
• Exceptional corrosion resistance with 316 Stainless Steel construction, ideal for harsh or chemically aggressive industrial environments.
• Enhanced durability and wear resistance from case hardening to a Rockwell C51 hardness, extending the washer's service life.
• Broad compatibility with both inch (No. 6) and metric (M3.5) screw sizes, offering versatile application across different systems.
• Reliable locking performance due to the wedge lock design, which creates a consistent and secure pre-load on the fastener assembly.
• Compliance with major environmental regulations, being RoHS 3 and REACH compliant, ensuring safety and regulatory acceptance for global supply chains.
• Precise dimensional fit with an ID of 0.15" and OD of 0.35", ensuring easy installation and optimal force distribution.

Professional Applications & Engineering Value

This 316 Stainless Steel Wedge Lock Washer is engineered to solve critical challenges in industrial fastening, particularly where vibration resistance is paramount. The dual serration on top and bottom surfaces ensures a powerful bite into both the bolt head/nut and the base material, effectively resisting rotational loosening in high-vibration environments like machinery, automotive assemblies, and outdoor structures. Made from 316 stainless steel, it offers excellent resistance to corrosion from chemicals, saltwater, and atmospheric exposure, making it suitable for marine, chemical processing, and food industry applications. The case hardened treatment to Rockwell C51 provides a hard, wear-resistant surface that maintains locking performance over repeated use, reducing maintenance downtime and replacement costs. This combination of material and design delivers reliable, long-term fastening security for demanding industrial applications.

Specification Summary & Compliance

This washer features precise dimensions with an Inside Diameter (ID) of 0.15", Outside Diameter (OD) of 0.35", and Thickness ranging from 0.080" to 0.100". It is designed for screw sizes No. 6 (inch) and M3.5 (metric), ensuring broad compatibility. The washer undergoes case hardening to achieve a Rockwell C51 hardness for enhanced durability. It is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, confirming it is free from hazardous substances and safe for use in regulated markets.