S-91114A013 0.221" ID x 0.475" OD ASME B18.21.1 External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance through external tooth design that bites into mating surfaces to prevent loosening under dynamic loads
• Enhanced corrosion protection with zinc-plated steel construction for extended service life in industrial environments
• Reliable hardness performance with Rockwell C40 rating ensuring consistent spring action and tooth engagement
• Precise dimensional compatibility with No. 12 screws through 0.221" ID and 0.475" OD for optimal fit and function
• Industry-standard compliance with ASME B18.21.1 specifications guaranteeing consistent quality and performance
• Environmental regulation adherence meeting RoHS 3 and REACH requirements for global industrial applications
• Optimized thickness range (0.020-0.027") providing proper compression and spring tension for secure fastening

Professional Applications & Engineering Value

These external tooth lock washers deliver critical vibration-resistant performance in demanding industrial applications where fastener security is paramount. The zinc-plated steel construction provides essential corrosion protection while maintaining the Rockwell C40 hardness required for repeated compression cycles. The strategically positioned external teeth create multiple biting points that dig into both the fastener head and mating surface, effectively resisting rotational forces and vibrational loosening common in machinery, automotive assemblies, and electrical equipment. Engineered to ASME B18.21.1 standards, these No. 12 washers ensure reliable performance in inch-system applications where precise dimensional control (0.221" ID, 0.475" OD) guarantees proper fit and maximum locking effectiveness.

Specification Summary & Compliance

This external tooth lock washer features precise dimensional specifications including 0.221" internal diameter, 0.475" outer diameter, and thickness ranging from 0.020" to 0.027". Manufactured to ASME B18.21.1 standards for consistent quality and performance in inch system applications. The product demonstrates full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial markets. The Rockwell C40 hardness rating confirms proper spring characteristics and durability for repeated use in vibration-prone applications.