3M 7100100320 Aluminum Oxide Sandpaper 40 Grit

Product Description

The 3M 7100100320 is an aluminum oxide sandpaper sheet engineered for hand sanding applications in automotive and general surface preparation work. Running a self-fracturing abrasive grain, this sheet continuously exposes fresh cutting edges as it wears, extending usable life and maintaining consistent stock removal throughout the job. At 40 grit, it cuts aggressively, making it well suited for stripping paint, removing rust, or knocking down heavy surface irregularities before moving to finer grits. Each sheet measures 3 2/3 inches x 9 inches, the standard third-sheet format that fits most hand-block sanding setups used by automotive and finishing technicians.

This sandpaper is intended for hand sanding tasks where power tool use is impractical or where controlled, localized material removal is required. Primary applications include automotive paint stripping, bodywork prep, and general surface conditioning on wood, metal, or composite substrates. The 40-grit cut level is typically the starting point in a progressive sanding sequence when significant material must be removed before finish work begins. Sold in packs, this product suits professional shops that keep coarse-grit consumables on hand in quantity.

Key Features

• Self-fracturing aluminum oxide grain exposes fresh cutting edges during use, extending sheet life
• 40 grit for aggressive paint stripping and heavy material removal
• Standard third-sheet size (3 2/3 inches x 9 inches) fits common hand sanding blocks
• Designed for hand sanding, providing controlled, localized surface prep
• Suitable for automotive, wood, metal, and composite surface applications

Compatibility

Designed as a standard third-sheet sandpaper for use with hand sanding blocks and manual sanding applications across automotive refinishing and general surface preparation.

Installation Notes

Load the sheet into a hand sanding block with the abrasive side facing out, ensuring the sheet is seated flat and secure before beginning work. Always wear appropriate respiratory protection and eye protection when dry sanding, particularly during paint or rust removal. Work in a well-ventilated area and follow applicable safety guidelines for handling sanding dust. Progress to finer grits after completing stock removal with this 40-grit sheet to achieve the desired surface finish.

Technical Specifications

• Grit: 40
• Abrasive Material: Aluminum Oxide
• Sheet Size: 3 2/3 inches x 9 inches
• Weight: 0.24 pounds
• Unit of Measure: Pack
• Minimum Order Quantity: 20
• UPC: 00051144030385

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100100320