S-97775A440 0.384" ID x 0.694" OD ASME B18.21.1; MS35335-63 Mil. Spec. External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with external teeth that bite into mating surfaces, preventing loosening under extreme conditions
• Exceptional durability from 410 stainless steel construction with Rockwell C40 hardness for long service life in harsh environments
• Precision dimensional control with 0.384" ID and 0.694" OD ensuring perfect fit for 3/8" fasteners
• Industry-standard compliance meeting both ASME B18.21.1 and MS35335-63 specifications for reliable performance
• Enhanced corrosion resistance through 410 stainless steel material, ideal for demanding industrial applications
• Environmental compliance with RoHS 3 and REACH regulations for safe use in regulated industries
• Optimized thickness range (0.032-0.040") providing consistent compression and reliable locking action

Professional Applications & Engineering Value

This heavy-duty external tooth lock washer delivers critical vibration resistance in demanding industrial environments where fastener security is paramount. Engineered from 410 stainless steel with Rockwell C40 hardness, it maintains structural integrity under constant stress and exposure to corrosive elements. The external tooth configuration creates multiple biting points that dig into both the fastener and base material, effectively preventing rotational loosening in high-vibration applications such as heavy machinery, automotive assemblies, and industrial equipment. Meeting ASME B18.21.1 and MS35335-63 standards, this precision 3/8" tooth lock washer provides engineers with a reliable solution for critical joints where failure is not an option, while its compliance with environmental regulations ensures suitability for global manufacturing requirements.

Specification Summary & Compliance

This tooth lock washer features precise dimensional specifications including 0.384" inner diameter, 0.694" outer diameter, and thickness ranging from 0.032" to 0.040" specifically designed for 3/8" screw size applications. Manufactured to exacting ASME B18.21.1 and MS35335-63 standards, it ensures consistent performance and interchangeability. The washer is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant (updated 06/14/2023, 235 SVHC), meeting the latest environmental regulations for industrial components.