S-90375A005 0.115" ID x 0.26" OD ASME B18.21.1 External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial and marine environments
• Maximum vibration resistance through external teeth that securely bite into mating surfaces, preventing fastener loosening
• Precise dimensional compatibility with No. 4 screws (0.115" ID, 0.26" OD) ensuring perfect fit and reliable performance
• Industry-standard compliance with ASME B18.21.1 specifications for guaranteed quality and interchangeability
• Environmental regulation compliance with RoHS 3 and REACH certifications for safe use in regulated industries
• Enhanced locking performance through external tooth design that maintains tension under dynamic loading conditions
• Durable construction with consistent thickness (0.012-0.018") for reliable service in demanding applications

Professional Applications & Engineering Value

Engineered to solve critical vibration-induced loosening in industrial assemblies, these 316 stainless steel external tooth lock washers provide exceptional locking security where reliability is paramount. The external teeth design creates multiple biting points that dig into both the fastener and mating surface, maintaining clamp force even under severe vibration and thermal cycling. This makes them ideal for industrial machinery, electrical enclosures, and marine equipment where corrosion resistance and vibration management are essential. The No. 4 screw compatibility ensures precise fitment in compact assemblies, while the ASME B18.21.1 compliance guarantees consistent performance across industrial applications requiring standardized components.

Specification Summary & Compliance

This external tooth lock washer features precise dimensional specifications including 0.115" inner diameter, 0.26" outer diameter, and thickness ranging 0.012-0.018" for No. 4 screw applications. 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) certification, ensuring environmental safety and regulatory acceptance for industrial use worldwide.