Value Collection 239090PS External Tooth Lock Washer

Product Description

The VALUE COLLECTION 239090PS is a zinc-plated, steel external tooth lock washer designed for use with 3/8 inch screws. The external tooth configuration bites into both the fastener bearing surface and the mating material to resist loosening caused by vibration and torque. Manufactured from Grade 2 steel with a zinc-plated finish for basic corrosion resistance, this washer measures 0.398 inches inside diameter, 0.694 inches outside diameter, and 0.04 inches thick. It is a standard hardware component installed by electricians, HVAC technicians, plumbers, and general mechanical trades wherever a reliable anti-loosening solution is required at a 3/8 inch fastener location.

External tooth lock washers in this size range are commonly used in panel assemblies, equipment mounting applications, junction boxes, and mechanical enclosures. They are suited for residential and light commercial installations where vibration or thermal cycling could otherwise cause fastener backout. This washer is appropriate for use on steel and other hard mating surfaces that allow the serrated teeth to seat properly and maintain clamping load over time.

Key Features

• External tooth design resists loosening under vibration and dynamic loading
• Grade 2 steel construction provides solid mechanical performance for standard fastening applications
• Zinc-plated finish offers basic corrosion resistance for indoor and protected environments
• 0.398 inches inside diameter fits standard 3/8 inch fasteners
• 0.04 inches thickness suits typical fastener stack-up tolerances

Compatibility

Designed as a standard external tooth lock washer for use with 3/8 inch screws and bolts in general mechanical, electrical, and HVAC fastening applications.

Installation Notes

Install this washer between the fastener head or nut and the mating surface, with the teeth facing the fastener bearing surface to allow proper bite. Ensure the mating surface is hard enough for the teeth to engage — avoid use on soft materials such as aluminum or plastics where tooth penetration may be inconsistent. Tighten fasteners to the torque specification required by the assembly, not the washer. Follow applicable codes such as NEC for electrical panel work or relevant mechanical codes for equipment mounting.