S-91757A128 0.64" ID x 1.071" OD ASME B18.21.1 Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through internal tooth design that bites into mating surfaces, preventing fastener loosening in high-stress applications
• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and outdoor applications
• Consistent performance maintained by Rockwell C40 hardness, ensuring teeth retain their locking capability through multiple installation cycles
• Precise dimensional compatibility with 0.64" ID and 1.071" OD, perfectly sized for 5/8" fasteners to ensure proper fit and function
• Industry-standard compliance with ASME B18.21.1 specifications, guaranteeing reliable performance in demanding mechanical applications
• Environmental regulation compliance with RoHS 3 and REACH standards, making them suitable for global supply chains and regulated industries
• Optimized thickness range (0.042-0.050") provides the ideal balance between locking force and space constraints in assembled components

Professional Applications & Engineering Value

This 5/8" internal tooth lock washer delivers critical vibration resistance in demanding industrial applications where fastener security is paramount. The 18-8 stainless steel construction provides excellent corrosion resistance for outdoor equipment, marine applications, and chemical processing environments where exposure to moisture and corrosive elements would compromise ordinary fasteners. The internal tooth location ensures maximum biting action directly against the fastener head and bearing surface, creating a mechanical lock that withstands intense vibration in machinery, automotive assemblies, and heavy equipment. With Rockwell C40 hardness, these washers maintain tooth integrity through repeated installations without deformation, making them ideal for maintenance applications requiring disassembly and reassembly. The precise dimensional control ensures consistent performance across production runs, reducing assembly issues and warranty claims in industrial washer applications.

Specification Summary & Compliance

This precision tooth lock washer features dimensional specifications of 0.64" inner diameter and 1.071" outer diameter with a thickness range of 0.042-0.050", specifically engineered for 5/8" fasteners. Manufactured to ASME B18.21.1 standards, these washers ensure consistent performance and interchangeability. 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. The internal tooth configuration provides superior locking action while maintaining the material integrity and corrosion resistance characteristics of 18-8 stainless steel throughout the product lifecycle.