S-90375A009 0.168" ID x 0.381" OD ASME B18.21.1 External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through external tooth design that bites into mating surfaces to prevent loosening under dynamic loads
• Excellent corrosion resistance with 316 stainless steel construction, ideal for harsh environments including chemical and marine applications
• Precise dimensional compatibility with No. 8 screws (0.168" ID) ensuring perfect fit and optimal locking performance
• Industry-standard compliance with ASME B18.21.1 specifications for reliable performance and interchangeability
• Environmental regulation compliance meeting RoHS 3 and REACH standards for safe use in regulated industries
• Consistent thickness control (0.018-0.023") for uniform pressure distribution and reliable sealing performance
• External tooth configuration provides maximum surface contact for enhanced grip without damaging soft materials

Professional Applications & Engineering Value

These 316 stainless steel external tooth lock washers deliver critical vibration resistance in demanding industrial applications where fastener security is paramount. The external teeth design creates multiple biting points that dig into both the fastener head and mounting surface, effectively preventing rotational loosening caused by machinery vibration, thermal cycling, or dynamic loads. Made from premium 316 stainless steel, these washers offer exceptional corrosion resistance in chemical processing, marine environments, and food processing equipment where exposure to moisture and corrosive agents is common. The precise No. 8 screw size compatibility (0.168" ID) ensures perfect fitment in automotive assemblies, electrical enclosures, and industrial machinery where reliable fastening is essential for operational safety and reduced maintenance intervals.

Specification Summary & Compliance

This external tooth lock washer features dimensional specifications of 0.168" inner diameter, 0.381" outer diameter, and thickness ranging from 0.018" to 0.023". Manufactured in compliance with ASME B18.21.1 standards for mechanical properties and dimensional requirements. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations regarding substance restrictions, ensuring environmental safety and regulatory acceptance across global markets.