S-91233A116 0.256" ID x 0.51" 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 durability and corrosion resistance with black oxide steel construction and Rockwell C40 hardness for long service life
• Precision dimensional accuracy with 0.256" ID and 0.51" OD ensuring perfect fit for 1/4" fasteners
• Reliable performance compliance meeting ASME B18.21.1 standards for quality assurance
• Optimal material thickness between 0.023-0.028" providing ideal spring tension without compromising strength
• Environmental regulation compliance with RoHS 3 and REACH adherence for global industrial applications
• External tooth configuration offering maximum surface contact and superior locking action compared to internal tooth designs

Professional Applications & Engineering Value

This external tooth lock washer delivers critical vibration-resistant fastening solutions for demanding industrial environments. Engineered from black oxide steel with Rockwell C40 hardness, it addresses the common challenge of fastener loosening in high-vibration machinery, automotive assemblies, and heavy equipment. The external tooth configuration provides superior biting action into both the fastener head and base material, creating a positive locking mechanism that maintains secure fastening under extreme conditions. The black oxide surface treatment enhances corrosion resistance while maintaining dimensional stability, making these precision washers ideal for applications where reliability and compliance with ASME B18.21.1 standards are paramount for operational safety and reduced maintenance costs.

Specification Summary & Compliance

This 1/4" external tooth lock washer features precise dimensional specifications including 0.256" inner diameter, 0.51" outer diameter, and thickness range of 0.023-0.028". Manufactured to meet ASME B18.21.1 standards for tooth lock washers, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, making it suitable for global industrial applications requiring environmental compliance. The external tooth location provides optimal locking performance for secure fastening in vibration-prone environments.