S-91114A029 0.256" ID x 0.51" OD ASME B18.21.1 External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with Rockwell C40 hardness to maintain secure fastening in high-stress environments
• Enhanced corrosion protection through zinc-plated steel construction for extended service life in industrial settings
• Reliable external tooth locking action that bites into mating surfaces to prevent loosening under dynamic loads
• Precise dimensional compatibility with 1/4" screws (0.256" ID, 0.51" OD) ensuring proper fit and optimal performance
• Industry-standard compliance with ASME B18.21.1 specifications for guaranteed quality and interchangeability
• Environmental regulation adherence meeting RoHS 3 and REACH requirements for safe, sustainable usage
• Consistent thickness control (0.023-0.028") for uniform load distribution and predictable clamping force

Professional Applications & Engineering Value

These zinc-plated steel external tooth lock washers deliver critical vibration-resistant fastening solutions for demanding industrial applications. The external tooth configuration provides superior biting action that prevents rotational loosening in machinery, automotive assemblies, and structural frameworks where 1/4" screw fastening requires maintained tension. The Rockwell C40 hardness ensures the teeth maintain their grip without deformation, while the zinc plating offers corrosion resistance in challenging environments. Engineered to ASME B18.21.1 standards, these washers solve common industrial challenges of fastener failure due to vibration, thermal cycling, and dynamic loading, making them ideal for OEM manufacturing, maintenance operations, and heavy equipment applications requiring reliable, long-term locking performance.

Specification Summary & Compliance

Manufactured to ASME B18.21.1 dimensional and performance specifications with inch system measurements (0.256" ID, 0.51" OD, 0.023-0.028" thickness). The external tooth lock washers feature precise tooth geometry for optimal locking performance and are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Material certification confirms zinc-plated steel construction with Rockwell C40 hardness verification, ensuring consistent quality and reliability for industrial fastening applications.