3M 7000144099 Psa Disc 400 Grit 5 Inches 175-pack

Product Description

The 3M 7000144099 is a pressure-sensitive adhesive (PSA) abrasive disc designed for surface finishing and material removal in professional shop and trade environments. Built on a lightweight A-weight paper backing, it uses silicon carbide abrasive at 400 grit, placing it in the super fine grade range. This makes it well-suited for final-stage sanding, scuff preparation, and light stock removal on a variety of substrates. Each package contains 175 discs at 5 inches in diameter, providing a practical quantity for sustained production work. Installation and removal are straightforward thanks to the PSA adhesive backing, which attaches directly to compatible sander pads without clips or hardware.

This disc is intended for use with random orbital sanders equipped with 5-inch PSA backing pads. At 400 grit, it is commonly used in finishing sequences on wood, metal, plastic, and composites where a smooth, consistent surface profile is required before coating, sealing, or final inspection. The flexible paper backing conforms to mild contours, making it usable on both flat and slightly curved workpieces. No vacuum holes are present, so it is best matched to solid, non-perforated sander pads. Typical users include finish carpenters, fabricators, auto body technicians, and maintenance tradespeople.

Key Features

• 400 grit silicon carbide abrasive for super fine surface finishing
• 5-inch diameter PSA disc with adhesive backing for tool-free pad attachment
• A-weight paper backing provides flexibility for flat and mildly contoured surfaces
• No vacuum holes — compatible with solid non-perforated PSA sander pads
• 175 discs per package for extended production use
• 3M Series 426U construction

Compatibility

Designed for use with random orbital sanders equipped with 5-inch solid PSA backing pads. No vacuum hole pattern is present, so perforated or hook-and-loop pads are not compatible without an adapter.

Installation Notes

Ensure the sander is powered off and unplugged before changing discs. Peel the release liner from the PSA backing and press the disc firmly onto a clean, dry sander pad to ensure full adhesion. Avoid contaminating the adhesive surface with oils or dust prior to attachment, as this reduces holding strength during operation. Disc replacement should be performed by the equipment operator following standard shop safety practices.