Value Collection SIWIS1500USA-010BX Internal Tooth Lock Washer

Product Description

The VALUE COLLECTION SIWIS1500USA-010BX is a steel internal tooth lock washer designed for use with 1-1/2 inch screws and fastener assemblies. It features an inside diameter of 1.53 inches and an outside diameter of 2.515 inches, with a zinc-plated finish that provides basic corrosion resistance for general indoor and light-duty applications. Manufactured from Grade 1075 steel, the internal tooth design bites into both the fastener bearing surface and the mating material to resist loosening under vibration or dynamic loads. Electricians, HVAC technicians, plumbers, and mechanical contractors use this type of washer as a standard hardware component in panel, equipment, and structural fastening applications.

This internal tooth lock washer is suited for residential and light commercial mechanical, electrical, and plumbing installations where a 1-1/2 inch screw or bolt is used. It is commonly installed in junction boxes, equipment enclosures, mounting brackets, and mechanical assemblies where vibration resistance is required. The zinc plating makes it appropriate for dry or mildly humid indoor environments. Single-piece packaging supports individual replacement and service use.

Key Features

• Internal tooth design grips both fastener and mating surface to resist loosening under vibration
• Inside diameter of 1.53 inches fits standard 1-1/2 inch screw applications
• Outside diameter of 2.515 inches provides broad bearing surface coverage
• Grade 1075 steel construction for reliable mechanical strength
• Zinc-plated finish for basic corrosion resistance in dry indoor environments
• Does not meet military specifications — intended for standard commercial and residential use

Compatibility

Designed as an OEM-style replacement or service hardware component for use with 1-1/2 inch screws in standard mechanical, electrical, and plumbing fastening applications.

Installation Notes

Lock washers of this type are installed by electricians, HVAC technicians, and plumbers as part of standard fastening assemblies. Always de-energize or shut off the relevant system before accessing any panel, enclosure, or equipment where this washer is being installed or replaced. Place the washer flat against the mating surface with the teeth facing the fastener bearing surface before torquing the screw. Consult applicable NEC or mechanical code requirements for fastener specifications in your specific application.