S-90069A216 0.255" ID x 0.454" OD ASME B18.21.1 Countersunk External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with external teeth that bite into mating surfaces, preventing fastener loosening in high-stress environments
• Enhanced corrosion protection through black oxide steel construction, extending service life in demanding industrial applications
• Precision 82° countersink angle ensures flush mounting with standard flat head screws for clean, professional installations
• Exceptional hardness rating of Rockwell C40 maintains tooth integrity and locking performance under repeated stress cycles
• Optimized dimensional accuracy with 0.255" ID and 0.454" OD for perfect fit with 1/4" fasteners, eliminating installation issues
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for safe use in global industrial markets
• Industry-standard reliability manufactured to ASME B18.21.1 specifications for consistent performance in critical applications

Professional Applications & Engineering Value

These external tooth lock washers deliver critical vibration-dampening performance in machinery, automotive, and heavy equipment applications where fastener security is paramount. The black oxide steel construction provides durable corrosion resistance while the precisely engineered 82° countersink angle ensures seamless integration with standard flat head screws. The external tooth configuration creates maximum surface bite, effectively preventing rotational loosening in high-vibration environments. Engineered to ASME B18.21.1 standards, these washers maintain consistent locking force across temperature variations and dynamic loading conditions, making them ideal for assembly lines, power transmission systems, and structural frameworks where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to exacting ASME B18.21.1 specifications with precise dimensional tolerances: 0.255" internal diameter, 0.454" external diameter, and 0.020-0.025" thickness range. Features external tooth location configuration and 82° countersink angle for optimal performance with standard flat head fasteners. The black oxide steel construction achieves Rockwell C40 hardness for lasting durability. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across international industrial markets.