Bullard 37638 Flap Disc Type 29 Zirconium 4.5 Inch 80 Grit

Product Description

The BULLARD 37638 is a zirconium flap disc engineered for metal grinding and finishing applications. Built to the Type 29 high-profile geometry, it presents the abrasive surface at an angle that concentrates cutting pressure on the workpiece, improving material removal rates on flat and contoured surfaces. The disc measures 4.5 inches in diameter with a 5/8-11 threaded hub and is rated to a maximum of 13,300 RPM. The 80-grit zirconium abrasive delivers an aggressive cut while leaving a consistent surface finish, making it suited for weld removal, edge blending, and surface prep on mild steel, stainless steel, and other metals. Discs are sold individually, with a box quantity of 10 units.

This flap disc is intended for use with 4.5-inch right-angle grinders equipped with a 5/8-11 threaded spindle. It is a standard selection for metal fabrication shops, welding operations, and structural steel work where both grinding and finishing are performed in a single pass. The Type 29 profile is commonly chosen when the operator needs to maintain consistent contact across broader surface areas or work at a lower angle to the material.

Key Features

• Type 29 high-profile geometry for angled grinding contact and increased surface coverage
• Zirconium abrasive grain for aggressive stock removal and extended disc life on metal
• 80-grit rating balances material removal speed with surface finish quality
• 5/8-11 threaded hub fits standard 4.5-inch right-angle grinders
• 13,300 RPM maximum speed rating
• Sold in a box of 10 discs

Compatibility

Designed for use with 4.5-inch right-angle grinders fitted with a 5/8-11 threaded spindle. Suitable for grinding and finishing mild steel, stainless steel, and similar metals.

Installation Notes

Disc mounting and use should be performed by qualified personnel following ANSI B7.1 and tool manufacturer guidelines. Confirm the grinder spindle speed does not exceed the 13,300 RPM disc rating before operation. Inspect the disc for damage before each use and never operate a cracked or delaminated disc. Appropriate PPE including face shield, gloves, and hearing protection is required during grinding operations.

Technical Specifications

• Disc Diameter: 4.5 inches
• Hub Thread: 5/8-11
• Disc Type: Type 29 High Profile
• Abrasive Material: Zirconium
• Grit: 80
• Maximum RPM: 13,300
• Application: Metal Grinding and Finishing
• Box Quantity: 10

Standard Information

• Brand: BULLARD
• Manufacturer Part Number: 37638