3M 7100309797 Fiber Disc 36 Grit 4 in Ceramic

Product Description

The 3M 7100309797 is a 4-inch coated fiber disc engineered for aggressive stock removal on metal, weld seams, and hard surfaces. It uses a precision shaped ceramic abrasive grain bonded with a resinoid bond to a fiber backing. The 36-grit cut makes it well suited for heavy material removal where surface finish is a secondary concern. Rated to 15,000 RPM, the disc mounts via a standard 7/8-inch arbor hole and is purple in color for quick grade identification on the job. Licensed HVAC technicians, pipefitters, fabricators, and sheet-metal workers commonly reach for this disc when grinding welds or deburring cut edges.

This disc is a single-unit item sold within a minimum order quantity of 25, making it practical for shops and service companies that run grinding operations regularly. Typical applications include grinding carbon steel, stainless steel, and other hard alloys in light industrial, mechanical, and HVAC sheet-metal fabrication environments. The fiber backing provides rigidity and resistance to heat buildup during sustained grinding passes, allowing longer working intervals before disc change-out.

Key Features

• Precision shaped ceramic abrasive grain delivers consistent, fast cut on hard metals
• 36 grit for aggressive stock removal and weld-seam grinding
• Fiber backing resists flex and heat during heavy grinding passes
• Resinoid bond holds grain securely under high-load conditions
• 7/8-inch arbor hole fits standard backup pads and angle grinders
• Rated to 15,000 RPM for compatibility with most 4-inch angle grinders

Compatibility

Designed as an OEM-style replacement or direct-use fiber disc for standard 4-inch angle grinders and die grinders equipped with a compatible backup pad and 7/8-inch arbor attachment.

Installation Notes

Installation should be performed by a qualified operator familiar with abrasive grinding equipment. Confirm the grinder's rated no-load RPM does not exceed the disc's 15,000 RPM maximum before mounting. Always inspect the disc for cracks or damage before use and discard any disc that appears compromised. Use appropriate eye protection, gloves, and guards per ANSI B11 and applicable workplace safety codes.