S-91113A038 1.019" ID x 1.637" OD ASME B18.21.1 Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with internal teeth that bite into mating surfaces to prevent loosening under dynamic loads
• Enhanced corrosion protection through zinc plating that extends service life in demanding industrial environments
• Exceptional hardness rating of Rockwell C44 ensures teeth maintain gripping performance without deformation
• Precision dimensional control with 1.019" ID and 1.637" OD provides perfect fit for 1" fasteners
• Industry-standard compliance with ASME B18.21.1 guarantees consistent quality and performance
• Environmental responsibility through RoHS 3 and REACH compliance for sustainable operations
• Optimized thickness range (0.059-0.067") balances compression resistance with space constraints

Professional Applications & Engineering Value

These internal tooth lock washers deliver critical vibration-damping performance in heavy machinery, automotive assemblies, and industrial equipment where constant motion threatens joint integrity. The zinc-plated steel construction provides dual advantages: the steel core offers structural strength to withstand high clamping forces, while the zinc coating creates a protective barrier against corrosion in harsh operating conditions. The precisely positioned internal teeth concentrate locking force directly beneath the fastener head, creating superior resistance to rotational loosening compared to standard flat washers. This design is particularly valuable in applications subject to thermal cycling or variable loads, where maintaining preload is essential for safety and operational reliability. The combination of Rockwell C44 hardness and controlled thickness ensures consistent performance across production runs, making these washers ideal for OEM applications requiring standardized, reliable mechanical fasteners.

Specification Summary & Compliance

This 1" internal tooth lock washer features precise dimensional specifications including 1.019" inner diameter, 1.637" outer diameter, and thickness ranging from 0.059" to 0.067". Manufactured to ASME B18.21.1 standards for tooth lock washers, it ensures consistent quality and performance in inch system applications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting the latest environmental requirements for industrial components. The internal tooth configuration provides reliable locking action for 1" fasteners in various mechanical assemblies.