3M 7000000639 Disc Backing Pad Adhesive Psa

Product Description

The 3M 7000000639 is a medium-density disc backing pad that uses a pressure-sensitive adhesive (PSA) attachment system. It serves as the interface between a power tool and PSA-style abrasive discs, holding the disc flat and transferring rotational force evenly across the abrasive surface. The medium-density construction provides a balance of conformability and support, making it suitable for both flat and moderately contoured workpieces. Weighing just 0.06 pounds, it is a lightweight component that does not add significant mass to the tool assembly. Installation and replacement are handled by grinding, metalworking, and fabrication tradespeople working with angle grinders or disc sanders.

This backing pad is intended for use with PSA abrasive discs in grinding, blending, finishing, and surface preparation applications. The PSA interface allows for quick disc changes without mechanical fasteners. Typical use scenarios include weld blending on steel fabrications, surface prep ahead of coating or painting, and general material removal tasks in shop or field environments. It is well suited to both production and maintenance work where consistent disc contact and backing support are required.

Key Features

• PSA (pressure-sensitive adhesive) attachment system for tool-free disc changes
• Medium-density construction balances conformability with firm abrasive support
• Lightweight at 0.06 pounds, minimizing added tool mass
• Compatible with PSA-style abrasive discs for grinding and finishing applications
• Single-unit packaging for straightforward replacement stocking

Compatibility

Designed as an OEM-style replacement backing pad for use with PSA abrasive discs on angle grinders and disc sanders that accept this backing pad style and diameter.

Installation Notes

Installation is performed by grinding or fabrication tradespeople. Always power down and disconnect the tool from its power source before removing or installing a backing pad. Ensure the spindle thread and pad threads are clean and fully engaged before operating the tool. Inspect the PSA surface for contamination before attaching an abrasive disc, as debris will reduce disc adhesion and can cause disc separation during operation.