Value Collection 31358 Internal Tooth Lock Washer 100 Pack

Product Description

The VALUE COLLECTION 31358 is a zinc-plated, Grade 2 steel internal tooth lock washer sized for 1/2 inch screws. Internal tooth lock washers grip the fastener and mating surface simultaneously, resisting loosening caused by vibration and torque. The hardened steel teeth bite into both surfaces when the fastener is tightened, maintaining clamp load over time. This package contains 100 washers. Electricians, HVAC technicians, plumbers, and general trade mechanics use internal tooth lock washers in panel assemblies, equipment mounting, and mechanical connections where vibration is a concern.

Internal tooth lock washers in this size range are standard hardware in residential and light commercial applications. They are used in electrical enclosures, HVAC unit mounting brackets, motor housings, and structural fastening assemblies wherever a 1/2 inch fastener requires positive locking. The zinc plating provides corrosion resistance suitable for indoor and protected outdoor installations. The 100-piece pack is sized for jobsite or shop stock.

Key Features

• Internal tooth design grips both fastener head and mating surface to resist vibration-induced loosening
• Grade 2 steel construction with zinc plating for corrosion resistance
• Inside diameter range of 0.512 to 0.529 inches fits standard 1/2 inch fasteners
• Outside diameter range of 0.867 to 0.883 inches provides broad bearing surface
• 0.039 inch thickness for consistent clamp load
• 100-piece pack supports bulk jobsite and shop use

Compatibility

Designed for use with standard 1/2 inch screws and bolts in residential and light commercial mechanical, electrical, and HVAC fastening applications.

Installation Notes

Installation requires no special tools beyond the appropriate wrench or driver for the mating fastener. Place the lock washer between the fastener head and the mating surface with the teeth facing the fastener head. Power down any electrical equipment before servicing panels or enclosures in which these washers are used. Follow applicable NEC or mechanical code requirements for the specific assembly being fastened.