S-91114A009 0.168" ID x 0.381" OD ASME B18.21.1 External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with external teeth that bite into mating surfaces to prevent loosening under dynamic loads
• Enhanced corrosion protection through zinc-plated steel construction for extended service life in industrial environments
• Precise dimensional compatibility with No. 8 screws, featuring 0.168" ID and 0.381" OD for reliable fit and function
• Exceptional hardness and durability with Rockwell C40 rating to maintain locking performance under repeated stress
• Industry-standard compliance with ASME B18.21.1 specifications ensuring consistent quality and performance
• Environmental responsibility through RoHS 3 and REACH compliance for safe use in regulated applications
• Optimized tooth design with external placement for maximum surface contact and secure fastening

Professional Applications & Engineering Value

This zinc-plated steel external tooth lock washer delivers critical vibration-resistant performance in demanding industrial applications. The external tooth configuration creates multiple biting points that dig into both the fastener and workpiece, effectively preventing rotational loosening caused by machinery vibration, thermal cycling, or dynamic loads. Manufactured from zinc-plated steel, these washers provide essential corrosion resistance while maintaining the mechanical strength needed for heavy-duty assembly operations. The precise No. 8 screw compatibility with 0.168" ID and 0.381" OD dimensions ensures proper seating and uniform load distribution. These features make these lock washers ideal for automotive assemblies, industrial machinery, electrical enclosures, and other applications where vibration-induced fastener failure poses significant operational risks.

Specification Summary & Compliance

This external tooth lock washer features dimensional specifications of 0.168" inner diameter, 0.381" outer diameter, and thickness ranging from 0.018" to 0.023". The product maintains Rockwell C40 hardness for optimal mechanical performance and strictly conforms to ASME B18.21.1 standards for tooth lock washers. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and regulatory acceptance for industrial applications worldwide.