Value Collection SIWIS0-80USA-100BX Lock Washer 100 Pack

Product Description

The VALUE COLLECTION SIWIS0-80USA-100BX is a Grade 2 steel internal tooth lock washer sized for No. 8 screws. It features a 0.176-inch inside diameter and a 0.34-inch outside diameter, with a zinc-plated finish that provides basic corrosion resistance in dry and mildly humid environments. The internal tooth design bites into both the fastener head and the mating surface to resist loosening under vibration. At 0.023 inches thick, this washer fits standard No. 8 hardware without adding significant stack height. Sold in a box of 100 units, this washer is a practical bulk fastener hardware item for electrical panel assembly, HVAC cabinet fabrication, and general mechanical applications.

This lock washer is used wherever a No. 8 screw fastens sheet metal, electrical enclosures, equipment cabinets, or similar assemblies that experience vibration or thermal cycling. Internal tooth washers are common in electrical and HVAC work because the teeth engage cleanly under the fastener head without protruding beyond the hardware envelope. This washer suits residential and light commercial applications. It does not meet military specifications and is intended for standard commercial fastening work.

Key Features

• Internal tooth design resists loosening under vibration and torque
• Grade 2 steel construction for standard commercial load requirements
• Zinc-plated finish for basic corrosion resistance
• 0.176-inch ID fits No. 8 screw hardware
• 0.023-inch thickness minimizes stack height in tight assemblies
• Sold in a box of 100 for shop stock and bulk service use

Compatibility

Designed for use with No. 8 screw fasteners in standard commercial and light industrial assemblies requiring an internal tooth lock washer.

Installation Notes

Install with hand tools standard to electrical, HVAC, or mechanical assembly work. Ensure the toothed face contacts the fastener head or workpiece surface directly so the teeth can engage and grip. Do not reuse lock washers that have been previously torqued, as the teeth may be flattened and will not provide adequate locking force. Follow applicable NEC or equipment manufacturer guidelines when installing fasteners inside electrical enclosures.