S-91233A118 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 bites into mating surfaces to prevent loosening under dynamic loads
• Enhanced corrosion protection through black oxide steel construction for extended service life in industrial environments
• Precision dimensional control with 0.513" ID and 0.9" OD ensuring perfect fit for 1/2" fasteners
• Exceptional mechanical strength with Rockwell C40 hardness rating for reliable performance under high stress conditions
• Industry-standard compliance meeting ASME B18.21.1 specifications for guaranteed quality and interchangeability
• Environmental responsibility with RoHS 3 and REACH compliance for safe use across global markets
• Optimized thickness range (0.037-0.045") providing consistent clamping force while accommodating surface variations

Professional Applications & Engineering Value

This black oxide steel tooth lock washer delivers critical vibration-resistant fastening solutions for demanding industrial applications. The external teeth configuration creates multiple biting points that dig into both the fastener and workpiece, effectively resisting rotational forces in machinery, heavy equipment, and structural assemblies. The Rockwell C40 hardness ensures the teeth maintain their biting capability without deformation, while the black oxide finish provides essential corrosion resistance in environments exposed to moisture and chemicals. Engineered specifically for 1/2" screw applications, this washer solves common loosening problems in automotive, construction, and manufacturing equipment where vibration-induced failure can lead to costly downtime and safety hazards.

Specification Summary & Compliance

This tooth lock washer features precise dimensional specifications including 0.513" inner diameter, 0.9" outer diameter, and thickness ranging from 0.037" to 0.045" for consistent performance. Manufactured in full compliance with ASME B18.21.1 standards for mechanical lock washers, ensuring dimensional accuracy and functional reliability. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) requirements, confirming environmental safety and regulatory acceptance for international industrial markets.