S-91475A395 0.252" ID x 0.487" OD ASME B18.21.1; MS35338-139 Mil. Spec. Split Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through split lock design prevents fastener loosening in high-stress applications
• Exceptional corrosion resistance with black-oxide coated 316 stainless steel construction for harsh environments
• Optimized dimensional compatibility with 1/4" screws ensures perfect fit and consistent performance
• Enhanced durability from Rockwell C35 hardness maintains structural integrity under repeated loading
• Industry-standard compliance with ASME B18.21.1 and MS35338-139 guarantees engineering reliability
• Environmental responsibility through RoHS 3 and REACH compliance meets modern regulatory requirements
• Precision engineering with 0.252" ID and 0.487" OD provides optimal spring action and locking force

Professional Applications & Engineering Value

This black-oxide 316 stainless steel split lock washer delivers critical vibration resistance in demanding industrial applications where fastener security is paramount. The split lock washer design creates continuous spring tension that compensates for thermal expansion, vibration, and load variations, preventing catastrophic fastener failure in machinery, automotive, and marine environments. The black-oxide surface treatment on 316 stainless steel provides enhanced corrosion resistance beyond standard stainless, making it ideal for chemical processing, offshore operations, and high-humidity applications. With precise dimensions (0.252" ID, 0.487" OD) engineered for 1/4" screw applications, this washer maintains clamping force in dynamic load conditions where traditional fasteners typically fail, reducing maintenance frequency and improving operational safety.

Specification Summary & Compliance

This standard split lock washer features inch system dimensions with 0.252" inner diameter, 0.487" outer diameter, and 0.062" thickness, specifically designed for 1/4" screw applications. Manufactured to ASME B18.21.1 and MS35338-139 specifications, ensuring dimensional accuracy and performance reliability. The component maintains Rockwell C35 hardness for optimal spring characteristics and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards for environmental safety and regulatory adherence in global markets.