S-90375A007 0.141" ID x 0.32" OD ASME B18.21.1 External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through external teeth design that bites into mating surfaces, preventing loosening under dynamic loads
• Excellent corrosion resistance in harsh environments thanks to 316 stainless steel construction, ideal for marine and chemical applications
• Precise dimensional compatibility with No. 6 screws (0.141" ID) ensuring perfect fit and optimal locking performance
• Industry-standard compliance with ASME B18.21.1 specifications for reliable mechanical performance and interchangeability
• Environmental safety assurance through RoHS 3 and REACH compliance, meeting strict international regulatory requirements
• Enhanced load distribution with 0.32" OD providing broader surface contact for improved joint integrity
• Consistent performance maintained across thickness variations (0.016-0.022") for reliable application in diverse assembly conditions

Professional Applications & Engineering Value

These 316 stainless steel external tooth lock washers deliver critical engineering solutions where vibration-induced fastener failure poses significant operational risks. The external teeth configuration creates multiple biting points that dig into both the fastener head and base material, creating mechanical interference that resists rotational loosening. This design proves particularly valuable in industrial machinery, automotive assemblies, and marine equipment where constant motion and vibration challenge joint integrity. The 316 stainless steel material provides exceptional resistance to chloride-induced stress corrosion cracking, making these washers ideal for chemical processing plants, offshore installations, and coastal applications. By combining the mechanical locking action with superior corrosion protection, these ASME B18.21.1 compliant washers extend equipment service life while reducing maintenance frequency and downtime.

Specification Summary & Compliance

This external tooth lock washer features precise dimensional specifications including 0.141" inner diameter for No. 6 screws, 0.32" outer diameter, and thickness ranging 0.016-0.022". Manufactured in compliance with ASME B18.21.1 standards for tooth lock washers, ensuring dimensional accuracy and performance reliability. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) compliance for chemical safety, validated as of June 14, 2023 against 235 Substances of Very High Concern.