Bullard 36638 Type 29 Flap Disc 4.5 in 80 Grit Zirconium

Product Description

The BULLARD 36638 is a Type 29 high-profile zirconium flap disc engineered for metal grinding and finishing applications. Built on a Tornado-Z platform, this disc uses zirconium abrasive grains arranged in overlapping flaps to deliver aggressive stock removal while progressively smoothing the workpiece surface. The 4.5-inch diameter disc fits a 7/8-inch arbor, runs at a rated maximum of 13,300 RPM, and carries an 80-grit designation suitable for medium-to-heavy material removal on ferrous and non-ferrous metals. Sold in a box of 10 discs, it is a practical stocking item for fabrication shops and field metalwork crews.

This disc is designed for use with 4.5-inch angle grinders commonly found on metal fabrication, structural steel, welding prep, and weld blending applications. The Type 29 conical profile presents the abrasive at an angle to the workpiece, which increases contact area and reduces operator fatigue during extended grinding passes. It is well suited for flat stock, weld seams, and contoured surfaces where a flat Type 27 disc would lose contact. Metalworkers, pipefitters, ironworkers, and welders will find it appropriate for both heavy grinding and intermediate finishing in a single disc.

Key Features

• Type 29 high-profile conical design for angled contact and improved grinding efficiency
• Zirconium abrasive grain for aggressive cut rate and extended disc life on metal
• 80 grit for medium-to-heavy material removal and surface blending
• 4.5-inch diameter with 7/8-inch arbor fits standard angle grinders
• 13,300 RPM maximum rated speed
• Packaged 10 discs per box for shop and field stocking

Compatibility

Designed as a direct-fit replacement flap disc for 4.5-inch angle grinders with a 7/8-inch arbor accepting Type 29 grinding accessories.

Installation Notes

Install and remove flap discs only while the grinder is unplugged or the power source is isolated. Inspect the disc for damage before each use and do not exceed the rated maximum RPM stamped on the disc. Use appropriate face shields and personal protective equipment as required by ANSI B11 and applicable workplace safety standards. Ensure the arbor nut is tightened securely with the correct wrench before operation.

Technical Specifications

• Disc Type: Type 29 High Profile
• Abrasive Material: Zirconium
• Grit: 80
• Diameter: 4.5 inches
• Arbor Size: 7/8 inch
• Maximum RPM: 13,300
• Application: Metal Grinding and Finishing
• Box Quantity: 10 discs
• Unit of Measure: Each

Standard Information

• Brand: BULLARD
• Manufacturer Part Number: 36638