CGW 42321 4-1/2" X 7/8" Type 29 36-Grit Z3 Zirconia Flap Disc

CGW 42321 is a 4-1/2 inch diameter, 7/8 inch arbor Type 29 zirconia flap disc designed for aggressive material removal on steel surfaces. The disc combines premium zirconia alumina grain with a poly/cotton backing, delivering durability and a smoother finish while maintaining high stock removal characteristics. The Zirconia concentration is intended to enhance material removal rates, particularly in heavy-duty grinding tasks, and an active grinding aid is included to promote cooler cutting under light pressure.

This flap disc is configured for aggressive use in demanding applications and is suitable for high-rate stock removal without excessive heat buildup under proper technique. The Type 29 profile provides a grinding angle intended for applications where a flatter contact surface is required, improving access on flats, welds, and other contoured areas typical in metalworking and fabrication settings. The combination of material composition and backing supports extended disc life and consistent performance, making it a practical option for maintenance and production environments that encounter tough steel grinding tasks.

Compatibility and packaging details indicate a 4.5" disc with a 7/8" arbor and a 36-grit size, at a specification of 13,300 RPM to best match equipment capabilities. The product is sold in box quantities of 10 discs, which helps maintain workflow continuity in shop settings where frequent disc changes occur. Users should follow standard safety and mounting procedures and select grit and disc type appropriate to the target material and desired surface finish.

Features:

• Premium Zirconia Alumina grain for high stock removal
• Poly/cotton backing provides durability and improved finish
• Type 29 flap design for aggressive grinding action
• Active grinding aid for cool cutting with light pressure
• 4-1/2" diameter, 7/8" arbor, 36-grit
• Fastest stock removal in steel applications