CGW 42145 is a 4-inch diameter Type 27 flap disc designed for heavy-duty material removal on steel and similar substrates. The disc integrates premium zirconia-alumina grain on a durable poly/cotton backing, which supports both aggressive stock removal and a reasonable finish. Zirconia grit is known for its self-sharpening properties and high grinding efficiency, making this disc suitable for demanding applications where rapid material removal is needed. An active grinding aid is incorporated to help reduce heat buildup during cutting, enabling lighter pressure and cooler operation without sacrificing speed.
This flap disc is configured with a 5/8-11 inch arbor and a center-type 27 flat grinding surface appropriate for off-hand and small-machine grinders. The 80-grit specification suggests a balance between material removal rate and surface finish, appropriate for deburring, beveling, and aggressive finishing tasks on carbon steel and similar alloys. The design emphasizes durability and consistency under heavy use, with the zirconia concentration driving fast stock removal while the poly/cotton backing supports longer disc life and steadier performance under load.
In practical use, users should expect high material removal rates with reduced dressing frequency compared to non-zirconia formulations. Maintain light to moderate pressure and allow the disc to do the work to maximize tool life and minimize heat. The package quantity is specified as one disc per item, with a box quantity of 10 for bulk ordering, aiding inventory planning for shop settings. This product is intended for compatible 4-inch right-angle or die grinders equipped with a 5/8-11 arbor, and users should confirm grinder RPM ratings (up to 15,300 RPM for this model) align with their equipment to ensure safe operation.
Features:
- Premium Zirconia Alumina grain on poly/cotton backing for durability and finish
- High stock removal with zirconia concentration
- Fastest stock removal in the marketplace for steel applications
- Recommended for aggressive use and heavy-duty grinding
- Active grinding aid provides cool cutting with light pressure
- 4" diameter, 5/8-11" arbor, Type 27, 80-Grit
- Grain:
- Zirconia
- Dia:
- 4
- Arbor/Shank Size:
- 5/8-11
- Type:
- 27
- Grit:
- 80
- RPM:
- 15300
- Package Size:
- Each
- Box Quantity:
- 10
