S-91757A111 0.32" ID x 0.61" OD ASME B18.21.1 Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with internal teeth design that bites into mating surfaces to prevent loosening under dynamic loads
• Excellent corrosion resistance from 18-8 stainless steel construction, ideal for harsh industrial environments
• Precise dimensional control with 0.32" ID and 0.61" OD ensuring perfect fit for 5/16" fasteners
• Consistent performance maintained through controlled thickness range of 0.028-0.034" for uniform locking pressure
• Industry-standard compliance with ASME B18.21.1 specifications for reliable mechanical performance
• Environmental responsibility with full RoHS 3 and REACH compliance for global manufacturing applications
• Optimized internal tooth placement for maximum contact area and superior locking action compared to external tooth designs

Professional Applications & Engineering Value

These 5/16" internal tooth lock washers provide critical vibration-resistant fastening solutions for demanding industrial applications. The 18-8 stainless steel construction offers exceptional corrosion resistance in challenging environments including marine, chemical processing, and outdoor equipment. The internal tooth configuration creates multiple biting points that dig into both the fastener and mounting surface, effectively preventing rotational loosening caused by vibration, thermal cycling, or dynamic loads. This design is particularly valuable in assembly lines, heavy machinery, automotive components, and electrical enclosures where reliable locking performance is essential for safety and operational integrity. The precise dimensional tolerances ensure consistent installation and optimal clamping force distribution across the fastened joint.

Specification Summary & Compliance

This tooth lock washer features inch system measurements with 0.32" internal diameter, 0.61" outer diameter, and thickness ranging 0.028-0.034" specifically designed for 5/16" screw sizes. Manufactured to ASME B18.21.1 standards ensuring dimensional accuracy and mechanical performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting the latest environmental and safety requirements for industrial components.