Specifications
| Disc Type | Flap Disc |
|---|---|
| Diameter | 4-1/2 in (115 mm) |
| Arbor / Bore | 7/8 in (22 mm) |
| Grit | 40 / 80 / 120 (assorted) |
| Pack Contents | 40 grit x10, 80 grit x10, 120 grit x2 |
| Pieces per Pack | 22 |
| Abrasive Grain | Zirconia Alumina & Aluminum Oxide |
| Suitable Materials | Metal, Stainless Steel, Wood |
| Application | Grinding, Blending, Finishing |
| Compatible Tool | Angle Grinder |
| Max. Operating Speed | 13,300 RPM |
| Brand | Whitby Abrasives |
Description
- UNMATCHED DURABILITY - 4 1/2" grinder sanding discs with top-grade alumina and hard zirconia abrasive grain in an industrial-grade, high-density build.
- PERFORMANCE - Maximum 13,300 RPM. Use eye protection and all safety guards per ANSI B7.1.
- VERSATILE - For metal and woodworking, concrete grinding, finishing, and stone smoothing — grinding, deburring, and rust removal.
- ASSORTMENT - 22 pcs: 40 grit (10), 80 grit (10), 120 grit (2). Mixed zirconia/alumina grain.
- SIZE - 4 1/2" Diameter, 7/8" Arbor (115mmx22mm).
Frequently asked questions
Q: What is a flap disc used for?
A: It grinds and finishes in one step — weld blending, deburring, rust and paint removal, and surface finishing on metal and wood.
Q: What is the difference between Type 27 and Type 29 flap discs?
A: Type 27 is flat for surface and edge work on flat areas; Type 29 is conical for more aggressive stock removal and better contact on edges and contours.
Q: What grinder do these fit?
A: Standard 4-1/2" angle grinders with a 7/8" arbor.
Q: Which grit should I choose?
A: Use a coarse grit (36–40) for heavy stock removal, medium (60–80) for general grinding, and fine (120+) for blending and finishing.
Why choose Whitby Abrasives
Whitby Abrasives Inc. is a Canadian supplier of professional grinding, cutting, sanding, and finishing abrasives. We focus on consistent quality, fair pricing, and fast shipping across Canada so fabricators, welders, woodworkers, contractors, and DIYers get abrasives that perform job after job. Have a question about sizing or the right grit for your project? Our team is happy to help.