Value Collection 31343 No.12 External Tooth Lock Washer 100pk

Product Description

The VALUE COLLECTION 31343 is a No. 12 screw external tooth lock washer manufactured from Grade 2 steel with a zinc-plated finish. External tooth lock washers grip mating surfaces when a fastener is torqued down, resisting loosening caused by vibration and dynamic loads. The serrated outer teeth bite into both the bearing surface and the fastener head, creating a mechanical lock. This washer measures 0.022 inches thick with an inside diameter range of 0.221 to 0.231 inches and an outside diameter range of 0.462 to 0.474 inches. Electricians, HVAC technicians, plumbers, and general trade professionals use these washers in panel assemblies, equipment mounting, and utility enclosure work. Sold in a pack of 100.

External tooth lock washers in No. 12 sizing are used across light-gauge sheet metal assemblies, electrical enclosures, HVAC equipment panels, and general mechanical fastening applications where vibration resistance is required. The zinc plating provides baseline corrosion protection suitable for indoor and sheltered outdoor installations. These are not rated to military specifications. Typical applications include securing screws in control panel assemblies, junction boxes, motor mounts, and equipment brackets where maintaining clamp load over time is critical.

Key Features

• External tooth design bites into bearing surface and fastener head to resist vibrational loosening
• Grade 2 steel construction for standard mechanical fastening applications
• Zinc-plated finish provides corrosion resistance for indoor and sheltered use
• Inside diameter range of 0.221 to 0.231 inches fits No. 12 screw sizing
• Thickness of 0.022 inches for consistent clamp load distribution
• Pack of 100 units for bench stock and field service kits

Compatibility

Designed for use with No. 12 machine screws and bolts in standard fastening applications. Suitable for light-gauge steel assemblies, electrical enclosures, and general equipment mounting where an external tooth lock washer is specified. Does not meet military specifications.

Installation Notes

Install with the teeth facing the fastener head or the surface requiring the locking action, never between two hardened surfaces where the teeth cannot embed. Ensure mating surfaces are clean and free of paint or coatings that would prevent tooth engagement. Torque fasteners per the assembly specification for the screw size and joint material. Single-use only — lock washers should not be reused once the teeth have been compressed.