3M 7100104902 Flap Disc 4.5 Inch 80 Grit Type 29

Product Description

The 3M 7100104902 is a Type 29 flap disc designed for medium to high-pressure metal grinding applications including beveling, weld removal, and edge deburring. Built with 3M Precision-Shaped Grain bonded to a durable polyester backing, this 4.5-inch disc cuts fast and holds up under aggressive unit pressure. At 80 grit, it removes material efficiently while leaving a finish quality suitable for applications where surface appearance matters. Licensed HVAC technicians, fabricators, pipefitters, and welders working with sheet metal, structural steel, and pipe regularly reach for this disc when consistent cut rate and finish control are both priorities.

This flap disc is suited for right-angle grinder use in fabrication shops, field pipe work, and structural steel applications. The Type 29 conical geometry provides an aggressive contact angle that concentrates pressure at the work surface, making it effective for weld blending and beveling on flat and curved stock. It performs on a variety of metals including carbon steel, stainless steel, and aluminum. Each flap progressively breaks down during use, continuously exposing fresh abrasive mineral so cut rate stays consistent from first use to last.

Key Features

• 3M Precision-Shaped Grain for fast, consistent material removal throughout disc life
• Type 29 conical geometry optimized for aggressive grinding, beveling, and weld removal
• Durable polyester backing withstands high unit pressure without delaminating
• Progressive flap breakdown exposes fresh mineral, maintaining cut rate over the full disc life
• Lower gouging risk compared to fiber discs and bonded abrasive wheels
• 80 grit delivers a balance of stock removal speed and acceptable surface finish

Compatibility

Designed for use with right-angle grinders accepting 4.5-inch Type 29 flap discs.

Installation Notes

This disc is installed and operated by fabricators, pipefitters, welders, and metal tradespeople using right-angle grinders. Always confirm the grinder RPM rating meets or exceeds the disc maximum RPM before mounting. Inspect the disc for damage before each use and discard any disc showing tears, delamination, or missing flaps. Wear appropriate PPE including a face shield, hearing protection, and gloves during operation.

Technical Specifications

• Diameter: 4.5 inches
• Grit: 80
• Disc Type: Type 29 (Right Angle)
• Backing Material: Polyester
• Abrasive Grain: 3M Precision-Shaped Grain
• Package Weight: 4.2 pounds
• Package Length: 8.88 inches
• Package Width: 5.75 inches
• Package Height: 6.13 inches
• Unit of Measure: Each
• Minimum Order Quantity: 10
• UPC: 076308644173

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100104902