S-90375A140 0.513" ID x 0.9" OD ASME B18.21.1 External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with external teeth design that provides maximum locking force and prevents fastener loosening under dynamic loads
• Exceptional corrosion resistance thanks to 316 stainless steel construction, ideal for harsh environments including chemical and marine applications
• Precise dimensional compatibility with 1/2" screws (0.513" ID) ensuring perfect fit and optimal performance in assembly operations
• Heavy-duty construction with 0.9" OD and 0.037-0.045" thickness for enhanced load distribution and mechanical stability
• Industry-standard compliance with ASME B18.21.1 specifications guaranteeing consistent quality and reliable performance
• Environmental regulatory compliance with RoHS 3 and REACH standards for safe use in regulated industries
• External tooth configuration that provides superior bite and locking action compared to internal tooth designs

Professional Applications & Engineering Value

These 316 stainless steel external tooth lock washers deliver critical engineering solutions for industrial applications where vibration-induced fastener failure is a major concern. The external teeth configuration creates multiple biting points that dig into both the fastener head and mating surface, providing exceptional resistance to rotational loosening. Made from 316 stainless steel, these washers offer superior corrosion resistance in challenging environments including chemical processing, marine equipment, and food processing machinery. The ASME B18.21.1 compliance ensures dimensional precision and performance reliability, while the specific design prevents damage to softer materials while maintaining secure fastening. These washers are particularly valuable in heavy machinery, automotive assemblies, and structural applications where vibration resistance and long-term reliability are paramount.

Specification Summary & Compliance

This external tooth lock washer features precise dimensional specifications including 0.513" inner diameter for 1/2" screws, 0.9" outer diameter, and thickness ranging from 0.037" to 0.045". The product strictly conforms to ASME B18.21.1 standards for tooth lock washers, ensuring consistent quality and performance. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental safety and restricted substance adherence. Manufactured in the inch measurement system, these washers provide reliable fastening solutions for industrial applications requiring corrosion resistance and vibration-proof locking performance.