S-91113A009 0.168" ID x 0.34" OD ASME B18.21.1 Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with internal teeth design that bites into mating surfaces to prevent loosening under dynamic loads
• Enhanced corrosion protection through zinc plating that extends service life in demanding industrial environments
• Optimized dimensional accuracy with 0.168" ID and 0.34" OD ensuring perfect fit for No. 8 screws
• Exceptional durability achieved through Rockwell C44 hardness rating for heavy-duty applications
• Reliable compliance with ASME B18.21.1 standards guaranteeing consistent performance and interchangeability
• Environmental responsibility through RoHS 3 and REACH compliance for sustainable manufacturing practices
• Precise thickness control (0.018-0.023") providing consistent compression and locking force distribution

Professional Applications & Engineering Value

These zinc-plated steel tooth lock washers deliver critical vibration resistance in demanding industrial applications where fastener security is paramount. The internal teeth design creates multiple biting points that dig into both the fastener and mounting surface, effectively preventing rotation and loosening caused by machinery vibrations, thermal cycling, or dynamic loads. Engineered specifically for No. 8 screw sizes, these washers provide reliable locking performance in automotive assemblies, heavy equipment manufacturing, electrical enclosures, and industrial machinery where vibration-induced failure can lead to costly downtime. The combination of Rockwell C44 hardness and precise dimensional control ensures these components maintain their locking capability through repeated stress cycles, making them ideal for critical joints in manufacturing, construction, and maintenance operations.

Specification Summary & Compliance

This tooth lock washer features precise inch dimensions with 0.168" internal diameter and 0.34" outer diameter, manufactured to exacting ASME B18.21.1 specifications for dimensional accuracy and performance reliability. The component maintains consistent thickness between 0.018-0.023" and demonstrates full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors while meeting international quality standards for mechanical fasteners.