S-91475A434 0.314" ID x 0.583" OD ASME B18.21.1; MS35338-140 Mil. Spec. Split Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through the split lock design that maintains constant tension and prevents fastener loosening under dynamic loads
• Exceptional corrosion protection with Black-Oxide coated 18-8 Stainless Steel construction for long-term reliability in harsh environments
• Optimized dimensional accuracy with precise 0.314" ID and 0.583" OD ensuring perfect fit for 5/16" screws
• Enhanced durability from Rockwell C35 hardness that resists deformation under high clamping pressures
• Industry-standard compliance meeting ASME B18.21.1 and MS35338-140 specifications for guaranteed performance
• Environmental responsibility with RoHS 3 and REACH compliance for safe use across global markets
• Reliable spring action from the standard split design that compensates for thermal expansion and material relaxation

Professional Applications & Engineering Value

This split lock washer delivers critical vibration resistance in demanding industrial applications where fastener security is paramount. The Black-Oxide 18-8 Stainless Steel construction provides superior corrosion resistance, making it ideal for outdoor equipment, marine environments, and chemical processing facilities where moisture and corrosive elements are constant threats. The Rockwell C35 hardness ensures the washer maintains its spring tension without deforming under high torque applications, while the precise 0.314" ID and 0.583" OD dimensions guarantee proper seating on 5/16" fasteners. Engineering teams specify this washer for machinery, automotive assemblies, and structural frameworks where vibration-induced loosening could lead to equipment failure or safety hazards, providing reliable locking performance that exceeds standard flat washer applications.

Specification Summary & Compliance

This precision split lock washer features exact dimensional specifications with 0.314" inner diameter, 0.583" outer diameter, and 0.078" thickness specifically engineered for 5/16" screw applications. Manufactured to ASME B18.21.1 and MS35338-140 standards, ensuring consistent quality and performance across production batches. The product maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for international industrial markets and restricted substance requirements.