3M
3M 55961 Type 27 Depressed Center Wheel 4 1/2 in .25 in 5/8-11 36 Grit 13,300 RPM
Depressed center grinding wheel with ceramic abrasive for steel and tool steel, Type 27 profile, 36 grit, threaded 5/8-11 arbor, rated to 13,300 RPM
- TypeSanders
- Type 27 depressed centre for aggressive angle-grinder grinding
- Ceramic abrasive cuts hard steel and tool steel faster
- 36 grit extra-coarse grade removes stock quickly
- 13 300 RPM maximum speed matches high-output grinders
- 5/8"-11 threaded hub fits standard angle-grinder spindles
4 1/2 in Type 27 Grinding Wheel
This 3M Green Corps depressed-centre wheel is a 4 1/2 inch diameter, .25 inch thick abrasive disc built for heavy stock removal on steel and tool steel. It mounts on angle grinders with a 5/8-11 threaded arbor and runs at a maximum 13,300 RPM. The ceramic grain and extra-coarse 36 grit deliver aggressive cutting action for weld grinding and surface preparation.
Suited For Heavy Metal Removal
The wheel suits fabricators and maintenance crews who need fast material removal on carbon steel and tool steel with a right-angle grinder. It is not for buyers who need a finer finish, a cutting-only disc, or a wheel rated for stainless steel or non-ferrous metals. The extra-coarse grade and Type 27 profile limit it to grinding tasks where surface finish is secondary to speed.
13,300 RPM Maximum Operating Speed
The 13,300 RPM rating is the single figure that decides compatibility: the angle grinder used must not exceed this speed. Exceeding the limit risks wheel breakage and serious injury, while running significantly slower reduces cutting efficiency. Always match the tool nameplate speed to the wheel rating before mounting.
Highlights
- Type 27 depressed centre for aggressive angle-grinder grinding
- Ceramic abrasive cuts hard steel and tool steel faster
- 36 grit extra-coarse grade removes stock quickly
- 13 300 RPM maximum speed matches high-output grinders
- 5/8"-11 threaded hub fits standard angle-grinder spindles
Specifications
| Type | Sanders |
|---|---|
| Brand | 3M |
| Model | 55961 |
Questions about this item
What does the 13,300 RPM rating mean when the wheel is on my angle grinder?
It is the maximum safe operating speed; your grinder must not exceed 13,300 RPM or the wheel can fail.
How does the 5/8"-11 threaded hole connect to the tool?
The 5/8"-11 thread screws directly onto the spindle of a compatible angle grinder without extra adapters.
What clearance does the 4 1/2 in diameter and .25 in thickness need on the grinder guard?
The guard must accommodate a 4 1/2 in diameter wheel that is .25 in thick for proper Type 27 mounting.
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