S-97775A512 0.513" ID x 0.9" OD ASME B18.21.1; MS35335-65 Mil. Spec. External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with external teeth that bite into mating surfaces to prevent loosening under dynamic loads
• Excellent corrosion resistance provided by 410 stainless steel construction for long service life in harsh environments
• Exceptional hardness and durability with Rockwell C40 rating to withstand high-pressure applications without deformation
• Precise dimensional compatibility with 0.9" OD and 0.513" ID designed specifically for 1/2" screw applications
• Reliable performance assurance through compliance with ASME B18.21.1 and MS35335-65 manufacturing standards
• Environmental compliance meeting RoHS 3 and REACH regulations for safe use in regulated industries
• Optimized thickness range (0.037-0.045") ensuring proper compression and locking action in assembly applications

Professional Applications & Engineering Value

This 410 stainless steel external tooth lock washer delivers critical vibration-resistant performance in demanding industrial environments where fastener security is paramount. The strategically positioned external teeth create multiple biting points that dig into both the fastener head and base material, effectively preventing rotational loosening caused by machinery vibration, thermal cycling, and dynamic loading conditions. Engineered to ASME B18.21.1 standards and meeting MS35335-65 specifications, this heavy-duty washer provides reliable locking action in critical assemblies including heavy machinery, automotive systems, construction equipment, and industrial manufacturing applications. The Rockwell C40 hardness ensures the teeth maintain their biting capability through repeated stress cycles, while the corrosion-resistant properties of 410 stainless steel make it suitable for outdoor, marine, and chemical exposure environments.

Specification Summary & Compliance

This external tooth lock washer features precise dimensional specifications with 0.9" outer diameter, 0.513" inner diameter, and thickness ranging from 0.037" to 0.045" for optimal performance with 1/2" fasteners. Manufactured to ASME B18.21.1 standards and meeting MS35335-65 specifications, the washer ensures consistent quality and performance. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant (updated 06/14/2023, 235 SVHC), making it suitable for use in regulated industries and environmentally conscious applications.