3M 7100113118 Cubitron Ii Hookit Disc 947A 3 in 40 Grit

Product Description

The 3M 7100113118 is a Cubitron II Hookit Cloth Disc in the 947A series, designed for aggressive material removal on metal surfaces. Built on an X-weight polyester-cotton cloth backing, this disc uses 3M Precision Shaped Grain technology to cut faster and last longer than conventional abrasive grain. A built-in grinding aid reduces heat buildup during use, which is critical when working stainless steel, nickel alloys, cobalt chrome, and other heat-sensitive exotic alloys. The Hookit attachment system allows fast disc changes without tools, making it practical for high-volume fabrication and weld grinding environments. Rated at 15000 RPM with a 3-inch diameter and 40 grit, this disc is suited for medium to high pressure grinding applications.

This disc is used in metalworking, fabrication shops, and aerospace maintenance environments where surface preparation and stock removal on hard alloys demand a durable, high-performance abrasive. Typical applications include weld blending, deburring, and surface conditioning on stainless steel, carbon steel, nickel alloys, and cobalt chrome. The 40 grit rating positions it for aggressive cutting rather than finish work. Installers and operators in metal fabrication and industrial maintenance are the primary users, often running these discs on right-angle grinders and die grinders equipped with Hookit backup pads.

Key Features

• 3M Precision Shaped Grain delivers fast cutting and extended disc life on hard metals
• Hookit attachment system enables quick disc changes and allows disc reuse over its service life
• X-weight polyester-cotton cloth backing handles aggressive sanding pressure without tearing
• Integrated grinding aid reduces heat and lowers grinding temperatures on heat-sensitive alloys
• Resin bond resists heat buildup and helps prevent workpiece discoloration
• 40 grit rating suited for medium to high pressure stock removal applications

Compatibility

Designed for use with Hookit-compatible backup pads on right-angle grinders and die grinders. Suitable for grinding and surface preparation on stainless steel, carbon steel, cobalt chrome, nickel alloys, and other exotic alloys.

Installation Notes

This disc is installed and operated by metalworkers, fabricators, and maintenance technicians using pneumatic or electric angle grinders. Ensure the grinder is powered off and disconnected from air or electrical supply before mounting or removing the disc. Verify the tool's free speed rating meets or exceeds the disc's 15000 RPM maximum before operation. Inspect the disc for damage before each use and do not exceed the rated speed.

Technical Specifications

• Diameter: 3 inches
• Grit: 40
• Maximum Speed: 15000 RPM
• Backing Material: X-weight polyester-cotton cloth
• Attachment Type: Hookit
• Series: 947A
• Package Weight: 3.36 pounds
• Package Length: 6.88 inches
• Package Width: 6.88 inches
• Package Height: 5.88 inches
• Unit of Measure: Each

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100113118