Depressed center grinding wheels, also called Type 27 grinding wheels, have a recessed hub so the wheel can work flat surfaces, edges and welds on an angle grinder.
Depressed center grinding wheels, also called Type 27 grinding wheels, have a recessed hub so the wheel can work flat surfaces, edges and welds on an angle grinder. This collection lists 1/4 inch thick aluminum oxide wheels from 4 to 7 inch for welders, fabricators and maintenance shops working on mild, structural and stainless steel.
- Type 27 depressed center shape in 4, 4-1/2, 5, 6 and 7 inch diameters.
- Every wheel is 1/4 inch (6 mm) thick for grinding work.
- 7/8 inch (22 mm) arbor on the 4-1/2 to 7 inch wheels and 5/8 inch (16 mm) on the 4 inch wheel.
- Aluminum oxide grain in packs of 5, 10 or 25, with fibreglass reinforcement listed on the 5, 6 and 7 inch wheels (double on the 7 inch).
- For weld grinding, edge beveling, deburring, stock removal and surface prep.
Frequently asked questions
What is a depressed center grinding wheel?
It is a bonded grinding wheel with a recessed hub, also known as Type 27. The dip lets the mounting nut sit below the grinding face, so you can hold the grinder at a low angle on flat work and into corners without the nut touching the part. The wheels here are 1/4 inch thick aluminum oxide.
Which size depressed center wheel fits my grinder?
Match the wheel diameter and arbor to your angle grinder. The 4 inch wheel has a 5/8 inch arbor, and the 4-1/2, 5, 6 and 7 inch wheels have a 7/8 inch arbor. Never exceed the maximum RPM marked on the wheel: it runs from 15,300 RPM on the 4 inch wheel down to 8,500 RPM on the 7 inch wheel.
Can I cut metal with a depressed center grinding wheel?
No. These 1/4 inch wheels are listed for grinding, weld grinding, beveling, deburring and surface prep, and cutting is not one of their listed uses. For cutting, use a cut-off wheel listed for cutting, and use each wheel only for the work it is listed for.
See more wheel types in Grinding Discs. For sizing and speed, read the grinding wheel buying guide and the grinding wheel RPM chart.
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.