Forney Industries Inc 71985 Flap Disc 4.5in 40 Grit Type 29

Product Description

The FORNEY INDUSTRIES INC 71985 is a Type 29 depressed-center flap disc designed for use with right angle grinders. It measures 4.5 inches in diameter with a 7/8 inch arbor and is loaded with 40-grit jumbo blue zirconia cloth flaps. The zirconia abrasive construction continuously exposes fresh, sharp grinding points as the flaps wear, delivering consistent cut rate throughout the life of the disc. Each disc is balance-tested for vibration-free operation and features a reinforced fiberglass backing plate. This disc is sold in a pack of 10 and is suited for fabricators, welders, and metalworkers who need aggressive stock removal with flexibility for contoured or flat surfaces.

The 71985 is intended for grinding, blending, and rough-to-fine finishing on metal surfaces. The Type 29 depressed-center geometry increases the contact angle with the workpiece, making it effective for flat surface work and weld seam removal. The 40-grit rating places this disc in the aggressive cutting range, appropriate for fast stock removal before transitioning to finer finishing steps. The zirconia abrasive is rated to outlast standard aluminum oxide sanding discs by a significant margin, reducing disc changes on high-volume jobs.

Key Features

• Type 29 depressed-center design increases contact angle for flat and weld-seam grinding
• 40-grit jumbo blue zirconia abrasive for aggressive stock removal
• Multiple layers of zirconia cloth flaps continuously expose new sharp grinding points as the disc wears
• Reinforced fiberglass backing plate for durability under load
• Each disc individually balance-tested for vibration-free grinding and finishing
• Laminated using automated equipment for consistent flap bonding and disc integrity

Compatibility

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

Installation Notes

Installation should be performed by the operator before connecting the grinder to power. Verify that the grinder spindle speed rating meets or exceeds the maximum rated speed of the disc before mounting. Ensure the arbor size matches and that the backing flange is properly seated before tightening. Always use appropriate PPE including eye protection and gloves when operating angle grinders with abrasive discs.