S-91233A111 0.115" ID x 0.26" OD ASME B18.21.1 External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through external teeth that bite into mating surfaces, preventing loosening under dynamic loads
• Enhanced corrosion protection with black oxide steel construction, extending service life in demanding industrial environments
• Consistent performance guaranteed by Rockwell C40 hardness, maintaining tooth integrity and spring action through repeated cycles
• Precision dimensional control with 0.115" ID and 0.26" OD ensuring perfect fit for No. 4 screws in inch-system applications
• Industry-standard compliance with ASME B18.21.1 specifications, providing reliable performance in critical assemblies
• Environmental responsibility through RoHS 3 and REACH compliance, meeting international regulatory requirements
• Optimized thickness range (0.012-0.018") delivers ideal spring tension while accommodating surface variations

Professional Applications & Engineering Value

This external tooth lock washer delivers critical vibration resistance in high-stress industrial applications where fastener security is paramount. The black oxide steel construction provides essential corrosion protection while maintaining the mechanical properties needed for demanding environments. The strategically positioned external teeth create multiple biting points that dig into both the fastener and mating surface, effectively resisting rotational forces and vibration-induced loosening. With Rockwell C40 hardness, these washers maintain their spring tension and tooth integrity through countless thermal cycles and mechanical stresses. Ideal for machinery, automotive assemblies, and electrical enclosures, these ASME B18.21.1 compliant washers ensure reliable performance in critical fastening systems where failure is not an option.

Specification Summary & Compliance

Manufactured to ASME B18.21.1 standards with precise dimensional control including 0.115" internal diameter, 0.26" outer diameter, and thickness ranging from 0.012" to 0.018" for No. 4 screw applications. The black oxide steel construction delivers consistent performance with Rockwell C40 hardness specification. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and global market acceptance.