Norton 63642543421 Disc Backing Pad Locking Nut 5/8-11

Product Description

The NORTON 63642543421 is a disc backing pad with a locking nut designed to secure abrasive discs on angle grinders and disc grinders used in metalworking, fabrication, and surface preparation applications. The pad features a 5/8-11 female thread for direct mounting to standard grinder spindles and is rated to a maximum of 10,000 RPM. Medium density construction provides consistent disc support across the working surface, helping maintain flat, even contact during grinding and finishing passes. Installed by metalworkers, fabricators, pipefitters, and general trade professionals, this backing pad is a standard consumable component in disc grinding setups.

This backing pad is suited for use in industrial and trade environments where angle grinders with 5/8-11 threaded spindles are standard. Typical applications include weld grinding, surface conditioning, and stock removal on metal substrates. The locking nut design allows for secure disc retention during operation, reducing the risk of disc slippage under load. Compatible with abrasive discs that accept a center-locking nut attachment system.

Key Features

• Locking nut design secures abrasive discs on 5/8-11 threaded spindle grinders
• 5/8-11 female thread fits standard angle grinder and disc grinder spindles
• 10,000 RPM maximum speed rating for high-speed grinding applications
• Medium density pad construction supports consistent disc contact pressure
• Sold individually, compatible with center-lock abrasive disc systems

Compatibility

Designed for use with angle grinders and disc grinders equipped with a 5/8-11 threaded spindle and compatible with abrasive discs using a center locking nut attachment.

Installation Notes

Installation should be performed by qualified metalworking or fabrication personnel. Disconnect and de-energize the grinder before mounting or removing the backing pad. Thread the pad fully onto the grinder spindle by hand before securing, and ensure the abrasive disc is properly seated and locked before resuming operation. Always verify that the tool RPM rating does not exceed the maximum RPM rating of the backing pad before use.