Value Collection 31330 Split Lock Washer 9/16 in Grade 5

Product Description

The VALUE COLLECTION 31330 is a Grade 5 steel split lock washer sized for 9/16 inch screws and finished with a zinc plating for corrosion resistance. Split lock washers work by biting into the bearing surface and fastener head under load, creating resistance to loosening from vibration or torque relaxation. This washer measures 0.564 to 0.574 inches inside diameter, 0.965 inches maximum outside diameter, and 0.141 inches thick. It is a standard inch-system fastener used across mechanical, structural, and equipment assembly applications by millwrights, pipefitters, electricians, and general maintenance technicians.

This split lock washer is suited for use in general industrial and commercial fastening applications where vibration resistance is required. It is appropriate for use with 9/16 inch bolts and screws in steel-to-steel connections, equipment mounting, panel assembly, and similar mechanical installations. The zinc plating provides a basic level of corrosion protection for indoor and light outdoor environments. This part is sold individually and carries a minimum order quantity of 100 pieces.

Key Features

• Grade 5 steel construction for reliable load bearing in standard fastening applications
• Zinc plated finish provides corrosion resistance in light-duty environments
• Split lock design bites into mating surfaces to resist loosening under vibration
• Inside diameter range of 0.564 to 0.574 inches for consistent fit on 9/16 inch fasteners
• Maximum outside diameter of 0.965 inches for compatibility with standard clearance holes
• Inch measurement system — fits standard SAE 9/16 inch screw and bolt hardware

Compatibility

Designed as an OEM-style replacement or general-use split lock washer for 9/16 inch screw and bolt fastening applications in inch-system assemblies.

Installation Notes

Install split lock washers between the fastener head or nut and the bearing surface before tightening. Ensure the mating surface is clean and free of debris before assembly to allow proper seating. De-energize or lock out any electrical or mechanical equipment before working on fastened assemblies per applicable safety codes. Do not reuse split lock washers that have been fully compressed flat, as the locking function will be reduced.