S-97775A220 0.168" ID x 0.381" OD ASME B18.21.1; MS35335-59 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 in high-stress applications
• Exceptional corrosion resistance through 410 stainless steel construction, ideal for harsh industrial environments
• Maintained locking force with Rockwell C40 hardness ensuring teeth retain their shape under repeated loading
• Precise No. 8 screw compatibility with 0.168" ID and 0.381" OD dimensions for accurate fit and optimal performance
• Guaranteed interchangeability through compliance with ASME B18.21.1 and MS35335-59 standards
• Enhanced durability with controlled thickness (0.018-0.023") providing consistent spring action and load distribution
• Environmental compliance assurance meeting RoHS 3 and REACH regulations for global industrial use

Professional Applications & Engineering Value

This 410 stainless steel external tooth lock washer delivers critical vibration resistance in demanding mechanical assemblies where No. 8 screws require secure fastening. The external tooth configuration creates multiple biting points that dig into both the fastener and workpiece, effectively resisting rotational forces that cause conventional washers to fail. Engineered with Rockwell C40 hardness, the teeth maintain their aggressive profile through repeated torque cycles, preventing the gradual loss of clamping force common in vibration-prone environments. The inch system dimensions (0.168" ID × 0.381" OD) ensure precise fitment while the corrosion-resistant 410 stainless steel material withstands exposure to moisture, chemicals, and temperature variations in industrial settings from machinery manufacturing to electrical enclosures.

Specification Summary & Compliance

This external tooth lock washer features precise dimensional tolerances with 0.168" inner diameter, 0.381" outer diameter, and thickness ranging 0.018-0.023". Manufactured to ASME B18.21.1 and MS35335-59 specifications, it ensures standardized performance and interchangeability. The washer demonstrates full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for global industrial applications requiring restricted substance control.