3M 7100309792 Fiber Disc 36 Grit 4 Inches Ceramic

Product Description

The 3M 7100309792 is a 4-inch coated fiber disc designed for aggressive material removal on metal, weld seams, and other hard surfaces. Built on a fiber backing with a resinoid bond, it carries precision shaped ceramic abrasive grain at 36 grit — a coarse cut suited for rapid stock removal and edge blending. The ceramic grain is engineered to fracture during use, continuously exposing sharp cutting edges, which sustains cut rate over the life of the disc. This disc is part of the 3M 1187C Series and is installed on right-angle grinders by metalworkers, fabricators, and maintenance technicians.

This fiber disc is used in industrial and fabrication settings where consistent, high-rate grinding is required on ferrous and non-ferrous metals. The arbor hole attachment fits standard right-angle grinders and disc grinders equipped with a backup pad. At 36 grit, it is appropriate for weld removal, surface conditioning, deburring, and rough stock removal. The disc is rated to a maximum of 12,000 RPM, making it compatible with most 4-inch angle grinder configurations used in shop and field work.

Key Features

• Precision shaped ceramic abrasive grain for sustained cut rate and long disc life
• 36 grit coarse cut — suited for weld removal, deburring, and rapid stock removal
• Fiber backing with resinoid bond for rigidity and durability under load
• 4-inch disc diameter with 5/8-inch arbor hole for standard backup pad mounting
• Maximum operating speed of 12,000 RPM
• Purple disc color for quick visual identification of the 1187C Series

Compatibility

Designed for use with standard right-angle grinders and disc grinders fitted with a 4-inch backup pad accepting a 5/8-inch arbor hole attachment.

Installation Notes

Installation is performed by metalworkers or maintenance technicians using a compatible backup pad and wrench. Ensure the grinder is powered off and unplugged before mounting or removing the disc. Verify the grinder RPM rating meets or exceeds the disc maximum of 12,000 RPM and never exceed that speed in operation. Inspect the disc for damage before each use and follow applicable ANSI B7.1 safety standards for abrasive wheel mounting and use.