S-90588A117 0.384" ID x 0.985" OD ASME B18.21.1 Internal / External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through dual internal/external teeth design that bites into mating surfaces, preventing loosening under dynamic loads
• Exceptional corrosion resistance provided by 410 stainless steel construction, ideal for harsh industrial environments
• Optimized dimensional precision with 0.384" ID and 0.985" OD ensuring perfect fit for 3/8" fasteners
• Enhanced locking performance from precisely engineered teeth that maintain consistent pressure and grip
• Industry-standard compliance with ASME B18.21.1 specifications for reliable, predictable performance
• Environmental regulation compliance meeting RoHS 3 and REACH requirements for global manufacturing applications
• Versatile installation capability with teeth on both internal and external edges for maximum contact surface area

Professional Applications & Engineering Value

This 410 stainless steel tooth lock washer delivers critical vibration resistance in demanding industrial applications where fastener security is paramount. The unique internal/external teeth configuration creates multiple biting points that dig into both the fastener head and mounting surface, effectively preventing rotational loosening caused by machinery vibration, thermal cycling, or dynamic loads. Manufactured from corrosion-resistant 410 stainless steel, this washer maintains its locking integrity in harsh environments where moisture, chemicals, or temperature variations would compromise ordinary fasteners. The precision-engineered teeth and consistent thickness (0.037-0.045") ensure uniform pressure distribution, making these tooth lock washers essential components in heavy machinery, automotive assemblies, construction equipment, and industrial manufacturing systems where reliable fastener retention cannot be compromised.

Specification Summary & Compliance

This heavy-duty 3/8" tooth lock washer features precise dimensional specifications including 0.384" inner diameter, 0.985" outer diameter, and 0.037-0.045" thickness range. Manufactured in compliance with ASME B18.21.1 standards for dimensional accuracy and performance requirements. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations (updated 06/14/2023, 235 SVHC), ensuring environmental responsibility and global market acceptability. The internal/external tooth configuration provides maximum locking effectiveness while maintaining industry-standard compatibility.