Milwaukee 3670-20 M18 FUEL Braking Grinder 4-1/2 to 6 Inch
- M18 FUEL 4-1/2-6 braking grinder, paddle switch
- 9000 RPM maximum speed
- 18 volt lithium-ion battery power, 156 watts
- Angled grinder body
- 16 ounces listed, 16.77 x 7.44 x 4.09 inches
- Metal and plastic body, black and red
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A cordless angled grinder with a paddle switch and braking. Battery and charger are not shown as included, so budget for them.
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ASIN: B0DNGQL3TVModel: 3670-20Category: Power Grinders
Overview
Gripping the paddle switch controls this angled cordless grinder, which Milwaukee lists as a fuel-series braking model. A lithium-ion battery supplies power, and the body is built from metal and plastic.
A braking grinder stops the wheel soon after you release the switch, which is the practical gain for anyone moving between cuts. The unknowns are the pack and charger, which the listing does not itemize, and the odd weight figure that looks like a bare-tool value.
Who it's for
People already on the Milwaukee battery system get the most from a bare-tool grinder like this. Buyers starting from nothing should confirm what ships before ordering.
Pros and cons
- Braking function named in the item name
- Paddle switch control
- Angled body suits wheel work
- Metal and plastic construction
- Battery and charger inclusion unclear
- Wheel diameter not stated plainly
- Listed weight looks like tool only
Performance notes
Wheel speed is set by the maximum rotation figure, while the battery sets how long that speed can be held under load. The braking feature shortens spin-down time after release. Heavy grinding drains a lithium-ion pack faster than light deburring.
Specifications
| Brand | MILWAUKEE |
|---|---|
| Model | 3670-20 |
| Dimensions & fit | |
| Item Dimensions L X W X H | 16.77 x 7.44 x 4.09 inches |
| Item weight | 16 ounces |
| Capacity & performance | |
| Maximum Rotational Speed | 9000 RPMlower than 72% of 122 power grinders |
| Wattage | 156 watts |
| Power & efficiency | |
| Power Source | Lithium ion battery |
| Voltage | 18 voltslower than 77% of 103 power grinders |
| Construction & materials | |
| Material Type | Metal, plastic |
| Color | Black and red |
| Included components | |
| Included Components | Milwaukee Electric M18 FUEL 4-1/2-6 braking grinder paddle switch |
| Warranty & support | |
| Manufacturer Warranty Description | Manufacturer warranty |
| Other details | |
| Style Name | Angled |
| Item Type Name | Milwaukee Electric - M18 FUEL 4-1/2-6 BRAKING GRINDER PADDLE SWITCH |
Closest rivals on specs
20V Brushless Cordless Angle Grinder Kit with 35 Accessories- Voltage 18 vs 20 volts (-10%)
Variable Speed Brushless Angle Grinder for DeWalt 20V- Voltage 18 vs 20 volts (-10%)
Frequently asked questions
Will the Milwaukee 3670-20 fit my existing Milwaukee batteries?
The listing says lithium-ion battery power at 18 volts and names an M18 FUEL grinder, but it does not list compatible battery models. Check the battery platform marking before ordering.
Does the Milwaukee 3670-20 come with a battery?
The listing's included item reads as the grinder itself, with no battery or charger named. Treat it as a bare tool unless the seller states otherwise.
What type of grinder is the Milwaukee 3670-20?
It is an angled model with a paddle switch and a braking function in the item name, running at up to 9000 RPM. It is not a straight die grinder.