S-90375A120 0.32" ID x 0.61" OD ASME B18.21.1 External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial and marine environments
• Exceptional vibration resistance through the external tooth design that bites into mating surfaces to prevent loosening
• Precise dimensional fit with 0.32" ID specifically engineered for secure 5/16" screw applications
• Reliable performance compliance meeting ASME B18.21.1 standards for consistent quality and interchangeability
• Enhanced environmental safety with full RoHS 3 and REACH compliance for regulated applications
• Optimized load distribution with 0.61" OD providing broader surface contact and improved joint integrity
• Consistent thickness control between 0.028-0.034" ensuring uniform compression and reliable locking performance

Professional Applications & Engineering Value

These 316 stainless steel external tooth lock washers deliver critical vibration resistance in demanding mechanical assemblies where thermal cycling, dynamic loads, and corrosive environments threaten joint integrity. The external tooth configuration creates positive mechanical locking by embedding into both the fastener head and bearing surface, effectively solving the common industrial problem of vibration-induced loosening in machinery, automotive, and marine applications. Manufactured to ASME B18.21.1 specifications with precise 5/16" internal diameter compatibility, these washers provide engineers with reliable, standardized components that maintain clamping force in high-stress environments. The corrosion-resistant 316 stainless steel composition ensures long-term performance in chemical processing, offshore, and food processing equipment where moisture and aggressive media would compromise ordinary fasteners.

Specification Summary & Compliance

This tooth lock washer features inch system dimensions with 0.32" internal diameter, 0.61" outer diameter, and controlled thickness between 0.028-0.034". Manufactured in compliance with ASME B18.21.1 standards for dimensional accuracy and performance. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations regarding substance restrictions, ensuring environmental responsibility and workplace safety. The external tooth location provides optimal locking action for standard 5/16" screw applications.