3M
3M 27400 Cubitron II 982C Fiber Disc 4-1/2 in 36 Grit PK25
A pack of 25 ceramic fiber discs with 36 grit for fast stock removal on 4-1/2 inch sanders running up to 13,300 RPM
- TypeSanders
- Extra-coarse 36 grit removes material fast
- 13,300 RPM max speed suits high-speed sanders
- 4-1/2 in diameter fits standard angle grinders
- 7/8 in unthreaded hole mounts without tools
- Pack of 25 discs keeps the job going
3M Cubitron II 982C Fiber Disc
The 3M 27400 is a 4-1/2 inch fiber disc designed for aggressive material removal on metal surfaces. It uses ceramic abrasive grain on a YF-weight fiber backing for tear resistance. Professional welders and fabricators use it for grinding welds and shaping edges.
36 Grit Capacity and 13,300 RPM Limit
The extra-coarse 36 grit cuts fast on carbon steel and stainless, handling heavy stock removal and leveling. Closed coating loads less on soft metals but fills quickly on aluminum or non-ferrous alloys. Maximum operating speed is 13,300 RPM; exceeding it risks disc failure.
25-Pack Unthreaded 7/8 Inch Mount
A box of 25 discs reduces changeover downtime on high-volume jobs. The 7/8 inch unthreaded center hole fits standard right-angle grinder spindles with a matching backup pad and nut. Maroon color identifies the 982C series grade at a glance.
Highlights
- Extra-coarse 36 grit removes material fast
- 13,300 RPM max speed suits high-speed sanders
- 4-1/2 in diameter fits standard angle grinders
- 7/8 in unthreaded hole mounts without tools
- Pack of 25 discs keeps the job going
Specifications
| Type | Sanders |
|---|---|
| Brand | 3M |
| Model | 27400 |
Questions about this item
Will the 7/8 in unthreaded hole fit the spindle on my older angle grinder?
The disc uses a 7/8 in unthreaded hole, which matches the standard arbor on most 4-1/2 in angle grinders. Check your tool’s manual to confirm the arbor size before mounting.
How can I verify the disc is running at the correct speed after installation?
Run the grinder at no load and confirm it does not exceed 13,300 RPM. The disc is rated for that maximum operating speed; staying at or below it ensures the ceramic grain cuts cleanly without overheating.
Does the pack contain 25 individual discs or 25 multi-disc packs?
Package quantity is 25, meaning the box holds 25 individual fiber discs. No backing pads, nuts or adapters are included, so purchase a compatible 7/8 in backing pad separately if you do not already have one.
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