S-91108A330 0.256" ID x 0.478" 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 loosening under dynamic loads
• Exceptional corrosion resistance with 316 stainless steel construction, ideal for harsh environments including marine and chemical applications
• Precise dimensional compatibility with 1/4" fasteners (0.256" ID, 0.478" OD) ensuring perfect fit and consistent performance
• Industry-standard compliance with ASME B18.21.1 specifications for reliable quality and interchangeability
• Environmental regulation compliance meeting RoHS 3 and REACH standards for safe use in regulated industries
• Optimized thickness range (0.023-0.028") providing ideal spring tension while maintaining space efficiency
• Internal tooth location concentrates locking force directly on the fastener for maximum securing effectiveness

Professional Applications & Engineering Value

These 316 stainless steel internal tooth lock washers deliver critical vibration-resistant performance in demanding industrial settings where fastener security is paramount. The internal tooth configuration creates multiple biting points that dig into both the fastener and mounting surface, effectively resisting rotational forces that cause conventional fasteners to loosen over time. This design proves invaluable in heavy machinery, automotive assemblies, and marine equipment where constant vibration and thermal cycling compromise joint integrity. The 316 stainless steel material provides exceptional resistance to chlorides, acids, and extreme temperatures, making these washers suitable for chemical processing, offshore platforms, and food processing equipment where corrosion resistance is non-negotiable. The combination of precision dimensions and standardized compliance ensures reliable performance across diverse industrial applications requiring durable locking solutions.

Specification Summary & Compliance

This internal tooth lock washer features precise dimensional specifications including 0.256" inner diameter, 0.478" 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 mechanical properties and dimensional requirements. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations regarding substance restrictions, ensuring environmental responsibility and workplace safety.