3M 7100104922 Fibre Disc 787C 120 Grit 4 Inch

Product Description

The 3M 7100104922 is a coated fibre disc from the 787C series, designed for ultra-rapid cutting on hard-to-grind metals. It is built around 3M Precision Shaped Grain, a mineral geometry that delivers higher cut rates and cooler surface temperatures compared to conventional abrasive grains. The disc measures 4 inches in diameter with a 5/8 inch arbor hole and carries a 120 grit rating, making it well suited for weld removal, blending, and finish refinement. A grinding aid is incorporated into the bond to reduce heat buildup during grinding. Licensed tradespeople working on stainless steel and high nickel alloy fabrication will find this disc a capable production tool.

This disc is intended for use on stainless steel, high nickel alloys, and similarly hard-to-grind metals in both fabrication shop and field environments. Typical applications include weld grinding, weld blending, beveling, edge chamfering, and surface finish refinement. It is compatible with 3M disc pad face plates and hubs, which are sold separately. The 120 grit designation positions it as a finishing and blending tool rather than a heavy stock-removal disc, though the Precision Shaped Grain allows it to outcut conventional fibre discs at the same grit level.

Key Features

• 3M Precision Shaped Grain delivers higher cut rates and cooler grinding action than conventional fibre disc minerals
• Integrated grinding aid reduces heat buildup, protecting heat-sensitive alloys from discoloration and metallurgical damage
• Stiff fibre backing and strong resin bond resist tearing under aggressive grinding pressure
• 4 inch diameter with 5/8 inch arbor fits standard angle grinders and disc pad assemblies
• 120 grit rating suits weld blending, beveling, and surface finish refinement
• Long disc life helps lower cost per part compared to conventional fibre discs

Compatibility

Compatible with 3M disc pad face plates and hubs sold separately. Designed for use on stainless steel and high nickel alloys. Fits angle grinders and disc grinders accepting a 4 inch diameter fibre disc with a 5/8 inch arbor.

Installation Notes

Fibre discs of this type are installed by metalworkers, fabricators, and maintenance tradespeople using angle grinders or disc grinders. Always power down and disconnect the grinder before mounting or removing a disc. Confirm the tool spindle speed rating meets or exceeds the disc maximum RPM rating before operation. Inspect the disc for damage before each use and wear appropriate PPE including face shield, gloves, and hearing protection in accordance with applicable ANSI and OSHA grinding safety standards.

Technical Specifications

• Diameter: 4 inches
• Arbor Size: 5/8 inch
• Grit: 120
• Abrasive Type: Precision Shaped Grain (Coated)
• Package Dimensions: 11.21 x 6.7 x 6.95 inches
• Weight: 3.234 pounds
• Unit of Measure: Each
• Minimum Order Quantity: 100
• UPC: 051125872848

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100104922