Value Collection SIWIS0500USA-100BX Lock Washer 100-pack

Product Description

The VALUE COLLECTION SIWIS0500USA-100BX is a zinc-plated, Grade 2 steel internal tooth lock washer sized for 1/2 inch screws. With a 0.53 inch inside diameter and a 0.9 inch outside diameter, this washer uses inward-facing serrated teeth to bite into both the fastener bearing surface and the mating material, resisting loosening caused by vibration and torque. At 0.045 inches thick, the profile stays low in tight fastener assemblies. This package contains 100 washers, making it a practical bench or job-site stock item for electricians, HVAC technicians, plumbers, and general trade professionals who need reliable fastener retention at volume.

Internal tooth lock washers in this size range are standard hardware in electrical panel assemblies, conduit fittings, equipment mounting brackets, HVAC cabinet fabrication, and plumbing fixture rough-in work. The zinc plating provides corrosion resistance suitable for indoor and moderately protected outdoor applications. Grade 2 steel offers adequate hardness and spring-back for general-duty fastening tasks. This box quantity supports ongoing service work, light fabrication, or replenishing a parts inventory without overcommitting to bulk pallet quantities.

Key Features

• Internal tooth design grips fastener and mating surface simultaneously to resist vibration loosening
• 0.53 inch inside diameter fits standard 1/2 inch screw shanks
• 0.045 inch thickness maintains a low profile in compact assemblies
• Zinc plating provides corrosion resistance for indoor and protected environments
• Grade 2 steel construction provides adequate hardness for general-duty fastening
• 100-piece box quantity suits service stock, small fabrication runs, and job-site kits

Compatibility

Designed for use with 1/2 inch screws and bolts in general mechanical, electrical, and HVAC fastening applications requiring vibration-resistant hardware.

Installation Notes

Internal tooth lock washers are installed by electricians, HVAC technicians, and general trade professionals as part of standard fastener assemblies. Place the washer between the fastener head and the mating surface with teeth facing the bearing surface for proper engagement. Torque the fastener to the specification required by the assembly or applicable code, such as NEC for electrical enclosures. Do not reuse a lock washer that has been fully compressed, as the teeth will no longer provide reliable locking action.