S-91150A120 0.512" ID x 0.923" 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 extreme conditions
• Exceptional durability with Grade 8 strength and Rockwell C44 hardness for heavy-duty industrial applications
• Reliable corrosion protection through zinc-plated steel construction in demanding environments
• Precise dimensional fit with 0.512" ID specifically engineered for 1/2" screw applications
• Industry-standard compliance meeting ASME B18.21.1 specifications for guaranteed performance
• Environmental responsibility with RoHS 3 and REACH compliance for sustainable operations
• Optimal load distribution with 0.923" OD providing enhanced surface contact area

Professional Applications & Engineering Value

This Grade 8 zinc-plated steel tooth lock washer delivers critical vibration resistance in high-stress industrial environments where fastener failure is not an option. The internal tooth design creates positive locking action by biting into both the fastener and mating surface, effectively preventing rotational loosening caused by machinery vibration, thermal cycling, and dynamic loads. Manufactured from high-strength steel with Rockwell C44 hardness, these washers maintain their locking capability under extreme pressure while the zinc plating provides essential corrosion protection. Ideal for heavy machinery, construction equipment, automotive assemblies, and industrial manufacturing applications, these ASME B18.21.1 compliant washers ensure reliable performance where standard flat washers would fail, significantly reducing maintenance frequency and equipment downtime.

Specification Summary & Compliance

This internal tooth lock washer features precise dimensional specifications including 0.512" inner diameter for 1/2" screws, 0.923" outer diameter, and thickness ranging from 0.054" to 0.070". Manufactured to ASME B18.21.1 standards with Grade 8 strength classification and Rockwell C44 hardness rating. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring both performance reliability and environmental responsibility for industrial applications.