3M 7000120329 Abrasive Disc 8 Inch 40 Grit Green Corps 251U

Product Description

The 3M 7000120329 is a coated abrasive disc from the Green Corps 251U series, designed for demanding material removal in automotive and fabrication applications. Built on a heavy E-weight backing, this 8-inch disc delivers the rigidity and durability needed for stripping paint from metal, shaping plastic body filler, and smoothing fiberglass surfaces. The abrasive mineral blend combines ceramic aluminum oxide to produce a fast cut rate and extended disc life compared to conventional aluminum oxide products. At 40 grit, this disc operates in the coarse range, making it well-suited for aggressive stock removal rather than finish work. It uses a pressure-sensitive adhesive (PSA) backing for fast, tool-free disc changes on compatible PSA backup pads.

This disc is used primarily in automotive body shops and metal fabrication environments where technicians need reliable performance across multiple substrate types. Common applications include removing factory paint or primer from steel panels, knocking down high spots in polyester body filler, and leveling fiberglass layup surfaces before finish sanding. The coarse 40-grit cut is appropriate for initial preparation stages where speed of material removal takes priority over surface finish quality. Both professional body technicians and experienced fabricators will find this disc fits standard production workflows.

Key Features

• 40-grit coarse cut for aggressive paint, filler, and metal material removal
• Ceramic aluminum oxide mineral blend delivers fast cut rate and extended disc life
• Heavy E-weight backing provides durability under sustained pressure
• Pressure-sensitive adhesive backing allows quick disc changes on PSA backup pads
• 8-inch diameter fits standard large-diameter PSA orbital and DA sanders
• Suitable for use on metal, plastic filler, and fiberglass surfaces

Compatibility

Designed for use with 8-inch PSA backup pads on standard orbital, dual-action, and right-angle sanders used in automotive body preparation and metal fabrication.

Installation Notes

Installation and disc changes should be performed with the sander disconnected from its power source or air supply. Ensure the backup pad surface is clean and free of adhesive residue before mounting to achieve full contact and prevent premature disc release. At 40 grit, this disc generates significant swarf and dust — appropriate respiratory protection and dust collection are recommended per applicable shop safety standards. Discard discs that show loading, glazing, or edge fraying to maintain cut efficiency and surface control.

Technical Specifications

• Disc Diameter: 8 inches
• Grit: 40
• Cut Grade: Coarse
• Abrasive Mineral: Ceramic aluminum oxide blend
• Backing Weight: E-weight
• Attachment Type: Pressure-sensitive adhesive (PSA)
• Series: Green Corps 251U
• Package Dimensions: 16 inches x 8.7 inches x 9 inches
• Package Weight: 3.95 pounds
• Unit of Measure: Box
• Minimum Order Quantity: 5

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7000120329