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T41 vs T42 Cutting Disc: Flat vs Depressed Center Explained
T41 and T42 are ISO shape codes for resin-bonded abrasive wheels. A T41 cutting disc is completely flat; a T42 disc has a depressed (raised-hub) center. The shape difference decides what each disc can safely do — and confusing them is a common, dangerous mistake.
T41 — Flat Cutting Disc
- Pure cutting wheel: the whole disc lies in one plane.
- Thinnest options (0.8–2.5 mm) for fast, precise, low-kerf cutting.
- Best for sheet, tube, profiles and chop saw wheels (300–400 mm chop saw discs are T41).
- Must never be used for grinding — side load can shatter a flat thin disc.
T42 — Depressed Center Disc
- The center is offset, lifting the flange above the disc face.
- Typically 2.0–6.0 mm thick: cutting & grinding discs (3.0 mm) and grinding discs (6.0 mm).
- The raised hub lets the disc face work at a shallow angle for edge grinding, deburring and weld dressing.
- Slightly reduced maximum cutting depth versus a flat disc of the same diameter.
Quick Comparison
| T41 flat | T42 depressed center | |
|---|---|---|
| Primary job | Cutting only | Cutting + grinding |
| Common thickness | 0.8–2.5 mm | 2.0–6.0 mm |
| Cutting depth | Maximum | Slightly less |
| Side-load tolerance | Low | High |
| Typical machines | Angle grinders, chop saws | Angle grinders |
How to Choose
- Only cutting, want speed and finish → T41.
- Cut then immediately deburr or dress welds → T42 3.0 mm.
- Stationary chop saw → always T41.
FAQ
Can I put a T42 disc on a chop saw?
No. Chop saws are designed for flat T41 wheels. A depressed-center disc can interfere with the vise and guard.
Is T27 the same as T42?
Both are depressed-center shapes. In practice T27 refers to 6 mm grinding discs and T42 to 2–3 mm cutting/grinding discs; terminology varies by market.
Which lasts longer, T41 or T42?
Per disc, T42's thicker section usually lasts longer, especially under rough handling. For pure cutting speed and finish, T41 wins.
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