3M 7100104978 Flap Disc 5 Inch 40 Grit Right Angle

Product Description

The 3M 7100104978 is a Type 29 right-angle flap disc designed for aggressive material removal on metal surfaces. Built with 3M Precision-Shaped Grain bonded to a durable polyester backing, this 5-inch, 40-grit disc delivers a fast, consistent cut rate throughout its service life. As the abrasive flaps wear down, fresh mineral is continuously exposed, maintaining cutting performance from first use to last. It is well-suited for medium to high-pressure grinding tasks and is typically installed and used by metalworkers, fabricators, and maintenance trades working with angle grinders.

This flap disc is used in applications that require both aggressive stock removal and an acceptable surface finish in the same pass. Common tasks include beveling, weld removal, and edge deburring on a range of ferrous and non-ferrous metals. The right-angle Type 29 configuration provides a low disc-to-workpiece angle, making it effective on flat and contoured surfaces. Its design reduces the risk of gouging compared to fiber discs and bonded grinding wheels, which is an advantage in finish-sensitive applications.

Key Features

• 3M Precision-Shaped Grain delivers a fast cut rate for increased productivity during aggressive grinding
• 5-inch diameter, 40-grit abrasive suited for medium to high material removal on metal
• Durable polyester backing withstands high unit pressure without delaminating
• Self-renewing flap design exposes fresh mineral as disc wears, maintaining consistent cut rate
• Lower gouging risk compared to fiber discs and bonded wheels, supporting finish-critical work
• Effective for beveling, weld removal, and edge deburring in fabrication and maintenance settings

Compatibility

Designed for use on standard 5-inch right-angle grinders. Suitable for stock removal and finishing on a variety of metals including steel and stainless steel.

Installation Notes

Mount this disc on a right-angle grinder rated for 5-inch accessories and confirm the grinder RPM rating does not exceed the disc maximum rated speed before operation. Ensure the grinder is powered off and unplugged before mounting or removing the disc. Use the appropriate flange and locking nut for a secure fit. Always wear appropriate personal protective equipment including a face shield and gloves when operating abrasive discs.

Technical Specifications

• Diameter: 5 inches
• Grit: 40
• Disc Type: Right Angle (Type 29)
• Abrasive Grain: 3M Precision-Shaped Grain
• Backing Material: Polyester
• Weight: 4.8 pounds
• Package Length: 8.88 inches
• Package Width: 5.75 inches
• Package Height: 6.13 inches
• Sold As: Each
• UPC: 076308643671

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100104978