CGW 42374 4-1/2" X 5/8"-11 Type 29 60-Grit XL Z3 Zirconia Flap Disc

The CGW 42374 4-1/2" x 5/8-11 Type 29 60-Grit XL Z3 Zirconia Flap Disc is designed for aggressive material removal on steel and similar metals. This flap disc combines premium zirconia alumina grain with a poly/cotton backing to deliver both durability and a finished surface, while the zirconia concentration enhances stock removal. The XL configuration typically means an extended flap area, providing more abrasive surface for continued grinding between dressings. An active grinding aid is included to help maintain cooler cutting under light pressure, which can reduce heat buildup and help preserve workpiece integrity during demanding grinding tasks.

In practice, this flap disc is suitable for heavy-duty, high-velocity grinding where fast stock removal is prioritized. The Type 29 profile is flared to offer an aggressive angle for access to flat and contoured surfaces, making it a good choice for bevels, weld seams, and rough shaping on ferrous metals. Operators should expect the combination of zirconia grain and the Type 29 geometry to deliver substantial material removal rates, while the grind aid works to moderate temperatures during use.

This item is configured to fit a 4.5" grinding wheel with a 5/8"-11 arbor/shank, a common standard for many right-angle grinders in shop environments. Each disc is sized for single-use applications in typical metalworking workflows, and packaging lists 10 discs per box. When selecting for a project, verify that the grinder’s RPM rating is compatible with the disc’s maximum operating speed of 13,300 RPM to avoid over-spinning the abrasive and ensure safe operation.

Features:

• Premium zirconia alumina grain on poly/cotton backing
• 60-grit Type 29 for aggressive stock removal
• Active grinding aid for cool cutting with light pressure
• 4-1/2" diameter with 5/8-11" arbor
• XL design for extended life and durability
• High stock removal on steel applications
• Suitable for heavy-duty applications