Milwaukee M18 FUEL 21mm
#1 in CordlessFull review
A cordless 21 mm polisher for large vehicles, for anyone already on the Milwaukee M18 platform.
Amazon $254.99$254.99
21 mm18 V battery6 in
3.5/5
A cordless 15 mm polisher for anyone already on the Milwaukee M18 battery platform.
- 15 mmOrbit
- 2,650-5,100 OPMSpeed
- 18 V batteryPower
- 3 yearsWarranty
Check price at Amazon$254
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- No cord to drag across paint
- Runs on any M18 battery you already own
- Holds speed under load
Cons
- Bare tool: battery and charger cost extra
- Three-year warranty is shorter than the M18 tool norm
The Milwaukee M18 FUEL random orbital polisher family
Every Milwaukee M18 FUEL random orbital polisher model we rank, smallest first. Ratings compare each against its own type.
| Model | Orbit | Rating | Price |
|---|---|---|---|
| Milwaukee M18 FUEL 15mm (this one) | 15 mm | 3.5/5 | $254 |
| Milwaukee M18 FUEL 21mm | 21 mm | 3.6/5 | $254.99 |
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.
Specifications
| Model number | 2684-20 |
|---|---|
| Polishing | |
| Orbit diameter | 15 mm |
| Speed range | 2,650-5,100 OPM |
| Backing plate | 5 in |
| Forced rotation | No |
| Power | |
| Power source | Cordless |
| Battery | 18 V |
| Cord | Cordless |
| Brushless motor | Not listed |
| Controls | |
| Constant-speed electronics | Yes |
| Soft start | Not listed |
| Lock-on trigger | Yes |
| Build | |
| Weight | 5.2 lb |
| Pads or polish included | No |
| Warranty | 3 years |
Alternatives in this type
SPTA 18V Cordless 15mm Kit
#3 in CordlessFull review
A complete cordless 15 mm kit at a low price, for occasional use where there is no outlet nearby.
Amazon $259.99$259.99
15 mm18 V battery
RUPES BigFoot HLR15 iBrid Kit
#4 in CordlessFull review
A light cordless 15 mm polisher sold complete with batteries, for mobile professionals who polish away from an outlet.
Amazon $676.46$676.46
15 mm18 V battery5 in
Compare
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