S-91812A229 0.28" ID x 0.45" 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 extreme dynamic loads.
• Exceptional corrosion resistance provided by 316 Stainless Steel, making it ideal for harsh environments, including chemical and marine applications.
• Enhanced durability and wear resistance from case hardening to a Rockwell C51 hardness, ensuring a long service life even under high stress.
• Reliable performance for 1/4" fasteners with a precise 0.28" ID and 0.45" OD, ensuring a perfect fit and optimal load distribution.
• Maintains clamping force in demanding applications due to its robust wedge lock design, reducing the need for frequent retightening and maintenance.
• Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safety and suitability for global industrial supply chains.
• Versatile for inch-system assemblies, providing a secure locking solution across various heavy-duty machinery and equipment.

Professional Applications & Engineering Value

This 316 Stainless Steel Wedge Lock Washer is engineered to solve critical challenges in high-vibration and corrosive industrial environments. The dual-side serrations create a powerful locking action by embedding into both the bolt head and the workpiece, effectively resisting rotational loosening caused by dynamic forces in machinery, transportation, and heavy equipment. The use of 316 stainless steel provides excellent resistance to chlorides and acidic conditions, making it a reliable choice for offshore, chemical processing, and food industry applications where material integrity is paramount. Combined with case hardening to Rockwell C51, this washer delivers sustained holding power and surface durability, preventing fretting and galling. This design directly addresses the common industrial pain points of joint failure and maintenance downtime, offering a robust, long-term fastening solution for 1/4" screw assemblies.

Specification Summary & Compliance

This washer conforms to standard inch system dimensions with an Inside Diameter (ID) of 0.28", Outside Diameter (OD) of 0.45", and a Thickness of 0.080-0.100", designed for a 1/4" screw size. The case hardened material achieves a Rockwell C51 hardness for superior strength. The product is manufactured to provide reliable performance and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in regulated markets.