S-91475A770 0.502" ID x 0.869" OD ASME B18.21.1; MS35338-143 Mil. Spec. Split Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance from the split lock design, preventing fastener loosening in high-stress applications
• Exceptional corrosion resistance with Black-Oxide 316 Stainless Steel construction, ideal for harsh industrial environments
• Reliable hardness performance at Rockwell C35, ensuring consistent spring action and long-term durability
• Precise dimensional fit with 0.502" ID designed specifically for 1/2" screws, providing secure fastening
• Compliance with rigorous standards including ASME B18.21.1 and MS35338-143, guaranteeing quality and interchangeability
• Environmental regulation compliance with RoHS 3 and REACH, making them suitable for global industrial applications
• Optimized size specifications (0.869" OD, 0.125" thickness) for balanced load distribution and space-efficient installations

Professional Applications & Engineering Value

This split lock washer delivers critical vibration-resistant performance in demanding industrial settings where fastener security is paramount. The Black-Oxide 316 Stainless Steel material provides excellent corrosion resistance against chemicals, moisture, and extreme temperatures, significantly extending service life in applications such as heavy machinery, marine equipment, and chemical processing plants. The split lock design creates constant spring tension that compensates for thermal expansion, vibration-induced loosening, and material relaxation – solving common maintenance issues in industrial washers applications. Engineered to ASME B18.21.1 and military specification MS35338-143, this washer ensures reliable performance in critical assemblies where failure is not an option.

Specification Summary & Compliance

This standard split lock washer features precise inch-dimension specifications with 0.502" inner diameter for 1/2" screw size, 0.869" outer diameter, and 0.125" thickness. Manufactured to exacting ASME B18.21.1 dimensional standards and military specification MS35338-143 for guaranteed performance. The product maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for international industrial markets and environmentally conscious manufacturing operations.