Forney 71987 Flap Disc 4.5 in 80 Grit Type 29 Zirconia 10 Pack

Product Description

The FORNEY INDUSTRIES INC 71987 is a Type 29 depressed-center flap disc designed for use with right angle grinders. Built from blue zirconia abrasive cloth, it measures 4.5 inches in diameter with a 7/8-inch arbor bore. Multiple overlapping zirconia cloth flap layers continuously expose fresh, sharp cutting points as the disc wears, sustaining aggressive material removal through the full life of the disc. The reinforced fiberglass backing plate adds structural rigidity, and each disc is balance-tested to minimize vibration during grinding and finishing operations. This package contains 10 discs.

The 71987 suits metal fabrication, weld blending, rust and scale removal, and surface preparation on steel and other ferrous metals. Its Type 29 geometry creates a conical grinding angle that increases surface contact, making it effective for both rough stock removal and finer finishing passes. It is appropriate for use in professional shops, field fabrication, and maintenance and repair environments where a right angle grinder is the primary tool.

Key Features

• Type 29 depressed-center profile increases surface contact for aggressive grinding and finishing
• Blue zirconia abrasive cloth continuously exposes new cutting points as flaps wear
• 4.5-inch diameter with 7/8-inch arbor fits standard right angle grinders
• Reinforced fiberglass backing plate provides structural support under load
• Balance-tested construction reduces vibration for cleaner, more controlled results
• Package of 10 discs for extended job-site use

Compatibility

Designed for use with right angle grinders accepting a 4.5-inch disc with a 7/8-inch arbor bore.

Installation Notes

Installation and disc changes should be performed with the grinder fully powered off and unplugged or the battery removed. Confirm the grinder spindle speed rating meets or exceeds the maximum RPM marked on the disc before mounting. Use the correct flange and locking nut for the arbor size, and inspect the disc for cracks or damage before each use. Wear appropriate PPE including a face shield, gloves, and hearing protection during operation.