4-1/2 inch flap discs, also called 4.5 inch flap discs or 4.5 flap wheels, run on angle grinders.
4-1/2 inch flap discs, also called 4.5 inch flap discs or 4.5 flap wheels, run on angle grinders. This collection gathers the 4-1/2 x 7/8 inch flap discs we stock, from 40 grit for fast stock removal to 60 and 80 grit for weld blending and 120 grit for finishing, for fabricators, welders and woodworkers.
- 4-1/2 inch (115 mm) discs with a 7/8 inch (22 mm) arbor hole for angle grinders.
- Zirconia alumina, calcined alumina, ceramic and silicon carbide grain, plus packs that mix zirconia and aluminum oxide.
- 36, 40, 60, 80 and 120 grit, in single-grit packs or assorted packs such as 40/60/80 and 40/60/80/120.
- Type 29 conical discs, including a half-curved edge ceramic disc, plus Type 27 jumbo discs in 36 grit and a flexible cushion bowl disc for contour work.
- Standard density and high density discs, most on a fibreglass backing, in packs of 3 to 50.
- Silicon carbide discs, including 120 grit, for stone, marble, granite, glass and non-ferrous metals.
Frequently asked questions
Will a 4-1/2 inch flap disc fit my angle grinder?
Yes, if your grinder takes 4-1/2 inch discs. The discs here have a 7/8 inch (22 mm) arbor hole that mounts on the grinder's flange and locking nut. Check that the maximum RPM marked on the disc is equal to or higher than your grinder's rated speed, and never run a disc faster than its marking.
Is a 4.5 flap wheel the same as a 4-1/2 inch flap disc?
Yes. 4.5 inch, 4-1/2 inch and 115 mm all describe the same disc, and many people call an angle grinder flap disc a flap wheel. This collection lists discs of that size with a 7/8 inch arbor. A flap wheel mounted on a shank is a different tool, used in a die grinder or drill.
What is a 40 grit 4-1/2 inch flap disc used for?
40 grit is the coarse choice for fast stock removal: grinding down welds and edge and contour grinding. It leaves visible scratches, so most shops follow it with 60 or 80 grit. Here, 40 grit comes in zirconia and calcined alumina, in single-grit or assorted packs.
When should I use a 60 grit 4-1/2 inch flap disc?
Use 60 grit when you want good stock removal with a smoother finish than 40 grit, such as blending welds, general grinding and removing rust and paint before finishing with 80 or 120 grit. It comes in zirconia, ceramic and calcined alumina, in single-grit or assorted packs.
See other sizes in Flap Discs. For help choosing, read how to choose a flap disc and Type 27 vs Type 29 flap discs.
Shipping, pickup and returns
- Ships from Whitby, Ontario to Canada and the United States. In-stock orders are dispatched within 1–2 business days.
- Free shipping on orders of $100 CAD or more in Canada and US$100 or more to the US. Otherwise a $20 CAD flat rate in Canada, a $27.50 CAD flat rate to the US, or carrier rates at checkout.
- Local pickup at Unit 2, 1450 Victoria Street East, Whitby, Ontario. Orders are usually ready in about 1 hour during business hours.
- Returns within 14 days of receipt for unused items in original packaging. Refund policy
- Buying in volume? Request a wholesale quote. We reply within 1–2 business days.