Value Collection KP66158 Split Lock Washer 12 Screw 250pk

Product Description

The VALUE COLLECTION KP66158 is a split lock washer sized for Number 12 screws, manufactured from AISI 4037 alloy steel with a zinc yellow dichromate finish. The helical split design bites into the fastener and mating surface under torque load, resisting loosening from vibration and dynamic loading. Inside diameter ranges from 0.220 to 0.227 inches, maximum outside diameter is 0.377 inches, and thickness is 0.056 inches. The zinc yellow dichromate coating provides moderate corrosion resistance suitable for general industrial and mechanical applications. Each package contains 250 washers. Installation requires no special tools beyond standard hand or power fastening equipment.

This split lock washer is suited for mechanical assembly, light fabrication, equipment maintenance, and general fastening work where a Number 12 screw is used. Typical applications include panel assembly, electrical enclosures, HVAC equipment mounting hardware, and equipment frames where vibration resistance is needed at the fastener joint. The inch-system dimensions make this washer a direct fit for standard imperial Number 12 fastener installations across residential, commercial, and light industrial settings.

Key Features

• AISI 4037 alloy steel construction for strength in high-torque fastening applications
• Zinc yellow dichromate finish for moderate corrosion resistance
• Helical split design resists fastener backout under vibration
• Inside diameter 0.220 to 0.227 inches for consistent Number 12 screw fitment
• 0.056-inch thickness provides reliable spring tension without excessive stack height
• Pack of 250 units supports production, maintenance, and bulk repair work

Compatibility

Designed for use with Number 12 inch-system screws and bolts in standard imperial fastener assemblies across mechanical, electrical, and HVAC applications.

Installation Notes

Install between the fastener head or nut and the mating surface with the split ends oriented to bite on final tightening. Ensure the mating surface is clean and free of burrs before assembly. Do not reuse split lock washers that have been fully compressed flat, as they will not provide effective locking force. No special certifications or regulated codes govern general split lock washer installation, but follow applicable equipment manufacturer torque guidelines for the fastener being used.