Bullard 37634 Type 29 Zirconium Flap Disc 4.5 in 40 Grit

Product Description

The BULLARD 37634 is a Type 29 high-profile zirconium flap disc designed for aggressive metal grinding and finishing. Built under the Tornado-Z line, this disc uses zirconium abrasive flaps arranged in the angled Type 29 configuration, which concentrates cutting pressure at the disc edge for faster stock removal on flat and contoured surfaces. At 40 grit, it handles heavy material removal while still leaving a workable surface finish. The 5/8-11 threaded hub fits standard angle grinders directly. Maximum rated speed is 13,300 RPM. Sold in boxes of 10, making it practical for ongoing jobsite or shop use.

This flap disc is suited for metal fabrication, structural steel prep, weld blending, and general grinding tasks in both shop and field environments. The Type 29 angle is especially effective on flat stock, pipe, and mild steel where aggressive cutting at lower operator effort is needed. Fabricators, ironworkers, and industrial maintenance technicians are the primary users. It performs across ferrous metals including mild steel and stainless-adjacent applications where zirconium abrasive provides durability advantages over standard aluminum oxide.

Key Features

• Type 29 high-profile design concentrates cutting force at the disc edge for efficient stock removal
• Zirconium abrasive grain delivers longer disc life compared to standard aluminum oxide on metal
• 40 grit rating suited for heavy grinding and initial surface preparation
• 5/8-11 threaded hub mounts directly to standard angle grinders without adapters
• 13,300 RPM maximum speed rating compatible with common 4.5-inch angle grinders
• Sold in a box of 10 discs for consistent supply on production or repetitive grinding tasks

Compatibility

Designed for use with standard angle grinders fitted with a 5/8-11 spindle thread, which is the common configuration for 4.5-inch grinders used in metal fabrication and maintenance applications.

Installation Notes

Installation should be performed by a qualified operator following the grinder manufacturer's instructions and ANSI B7.1 guidelines for abrasive wheel mounting. Confirm the grinder's rated RPM meets or exceeds the disc's 13,300 RPM maximum before mounting. Power down and unplug or lock out the grinder before changing discs. Never exceed the maximum rated speed and always use the grinder's guard in place during operation.

Technical Specifications

• Disc Type: Type 29 High Profile
• Abrasive Material: Zirconium
• Diameter: 4.5 inches
• Arbor Size: 5/8-11 threaded
• Grit: 40
• Maximum RPM: 13,300
• Application: Metal Grinding and Finishing
• Box Quantity: 10

Standard Information

• Brand: BULLARD
• Manufacturer Part Number: 37634