S-91475A507 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 prevents fastener loosening in high-stress applications
• Enhanced corrosion protection with Black-Oxide coated 18-8 Stainless Steel for extended service life in harsh environments
• Optimal hardness performance with Rockwell C35 rating ensures consistent spring action and load distribution
• Precise dimensional compatibility with 0.502" ID and 0.869" OD designed specifically for 1/2" screw applications
• Industry-standard compliance meeting ASME B18.21.1 and MS35338-143 specifications for reliable performance
• Environmental regulation adherence with RoHS 3 and REACH compliance for global industrial use
• Durable construction maintains integrity under repeated loading and thermal cycling conditions

Professional Applications & Engineering Value

Our Black-Oxide 18-8 Stainless Steel split lock washers provide critical vibration-resistant solutions for demanding industrial assemblies. The split lock washer design creates continuous spring tension that compensates for thermal expansion, material relaxation, and dynamic loading – common challenges in machinery, automotive, and heavy equipment applications. The Black-Oxide surface treatment on 18-8 Stainless Steel delivers superior corrosion resistance while maintaining the material's inherent strength, making these washers ideal for outdoor equipment, marine environments, and chemical processing facilities where both corrosion protection and reliable locking performance are essential. With precise dimensions (0.502" ID, 0.869" OD) engineered for 1/2" fasteners, these washers ensure proper fit and maximum contact surface for optimal load distribution.

Specification Summary & Compliance

These standard split lock washers feature precise dimensional specifications with 0.502" inner diameter, 0.869" outer diameter, and 0.125" thickness, manufactured to exacting standards for consistent performance. The washers comply with ASME B18.21.1 and MS35338-143 specifications, ensuring proper spring action and locking functionality. Material certification includes 18-8 Stainless Steel with Black-Oxide finish and Rockwell C35 hardness. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, making them suitable for regulated industrial applications worldwide.