3M 7100104603 Ceramic Fibre Disc 4 Inch 80 Grit

Product Description

The 3M 7100104603 is a 4-inch coated fibre disc built around 3M Precision Shaped Grain ceramic abrasive technology. Designated as the 782C, it is engineered for ultra-rapid material removal on carbon steel and similarly demanding ferrous surfaces. The precision shaped ceramic mineral geometry drives higher cut rates and longer disc life compared to conventional aluminium oxide or zirconia fibre discs. A stiff fibre backing and high-strength resin bond system keep the disc stable under aggressive pressure, resisting tearing and deformation during sustained grinding. At 80 grit, it balances aggressive stock removal with reasonable surface finish for pre-weld and post-weld applications. Licensed tradespeople and fabrication shop grinder operators are the primary installers.

The 7100104603 is suited to metal fabrication, structural steel work, and maintenance grinding applications where rapid weld removal, beveling, edge chamfering, and surface blending are required. Its 80-grit ceramic construction makes it effective for heavy stock removal on carbon steel plate, pipe, and structural shapes in both shop and field settings. It is sold individually and designed for use with compatible 3M disc pad face plates and hubs, which are sold separately.

Key Features

• 3M Precision Shaped Grain ceramic abrasive delivers higher cut rates than conventional fibre discs
• 80-grit construction balances aggressive stock removal with surface blending capability
• Stiff fibre backing and strong resin bond resist tearing under sustained load
• Effective for weld removal, beveling, edge chamfering, and finish blending on carbon steel
• Long-lasting abrasive mineral helps reduce per-part abrasive cost
• Compatible with 3M disc pad face plates and hubs (sold separately)

Compatibility

Designed for use with 3M disc pad face plates and hubs sold separately. Confirm grinder arbor size and RPM rating are compatible with a 4-inch fibre disc before mounting.

Installation Notes

Fibre discs of this type are mounted and operated by qualified grinding machine operators or tradespeople familiar with angle grinder safety practices. Always power down and disconnect the grinder before changing discs. Verify the grinder's maximum RPM rating meets or exceeds the disc's rated speed before use, and inspect the disc for cracks or damage prior to each use. Eye protection, a face shield, and appropriate PPE are required during operation.

Technical Specifications

• Disc Diameter: 4 inches
• Grit: 80
• Abrasive Type: Precision Shaped Ceramic
• Backing: Coated Fibre
• Unit of Measure: Each
• Minimum Order Quantity: 100
• Package Weight: 3.234 pounds
• Package Length: 11.2 inches
• Package Width: 6.7 inches
• Package Height: 6.95 inches
• UPC: 051125872800

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100104603