S-91757A109 0.256" ID x 0.478" OD ASME B18.21.1 Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with internal teeth that bite into mating surfaces, preventing loosening under dynamic loads
• Excellent corrosion resistance thanks to 18-8 stainless steel construction, ideal for harsh industrial environments
• Precision dimensional fit with 0.256" ID and 0.478" OD ensuring perfect compatibility with 1/4" screw applications
• Reliable performance compliance meeting ASME B18.21.1 standards for quality assurance in critical assemblies
• Enhanced safety and durability with controlled thickness (0.023-0.028") providing consistent spring tension
• Environmental regulation compliance with RoHS 3 and REACH adherence for global supply chain acceptance
• Reduced maintenance requirements through durable stainless steel construction that withstands repeated use

Professional Applications & Engineering Value

This internal tooth lock washer delivers critical engineering solutions for vibration-prone applications where fastener security is paramount. Manufactured from 18-8 stainless steel, it provides exceptional corrosion resistance in demanding environments such as marine, chemical processing, and outdoor equipment. The strategically positioned internal teeth create superior biting action that maintains clamp load integrity, effectively preventing vibration-induced loosening in machinery, automotive assemblies, and industrial equipment using 1/4" screw fastening systems. The precise dimensional control ensures consistent performance in high-cycle applications, making it an essential component for maintenance engineers and OEM designers seeking reliable vibration resistant solutions that meet rigorous industrial standards.

Specification Summary & Compliance

This tooth lock washer features precision dimensions of 0.256" ID and 0.478" OD with thickness maintained between 0.023-0.028". Manufactured in compliance with ASME B18.21.1 specifications for lock washers, ensuring dimensional accuracy and performance reliability. The product fully complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring strict material compliance standards.