S-90375A110 0.256" ID x 0.51" OD ASME B18.21.1 External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through external tooth design that bites into mating surfaces to prevent loosening under dynamic loads
• Exceptional corrosion resistance with 316 stainless steel construction, ideal for harsh environments and chemical exposure
• Precise dimensional compatibility with 1/4" screws (0.256" ID) ensuring proper fit and optimal locking performance
• Reliable compliance with ASME B18.21.1 standards for consistent quality and predictable performance
• Environmental safety assurance through RoHS 3 and REACH compliance, meeting strict regulatory requirements
• Optimized load distribution with 0.51" outer diameter providing stable bearing surface for secure fastening
• Durable construction maintaining performance in demanding industrial applications without deformation

Professional Applications & Engineering Value

These 316 stainless steel external tooth lock washers deliver critical vibration-resistant fastening solutions for demanding industrial environments. The external tooth design creates multiple biting points that dig into both the fastener and mating surface, effectively preventing rotation and loosening caused by machinery vibration, thermal cycling, or dynamic loading conditions. Made from premium 316 stainless steel, these washers offer superior corrosion resistance against chemicals, saltwater, and industrial atmospheres, making them ideal for marine equipment, chemical processing plants, food processing machinery, and outdoor applications. The precise 1/4" screw compatibility ensures easy installation while the ASME B18.21.1 compliance guarantees dimensional accuracy and reliable performance in critical assemblies where fastener security is paramount.

Specification Summary & Compliance

This external tooth lock washer features precise inch system dimensions with 0.256" inner diameter, 0.51" outer diameter, and thickness ranging 0.023-0.028" for optimal performance with 1/4" fasteners. Manufactured in compliance with ASME B18.21.1 standards for dimensional accuracy and mechanical properties. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations (updated 06/14/2023, 235 SVHC), ensuring environmental safety and regulatory adherence for global industrial applications.