VERIFIED · 2026 canonical · www.jaspecs.com

Milwaukee M18 Compact Brushless 1/4 in. Hex 3-Speed Impact Driver

Model number
3651-20

The Milwaukee M18 Compact Brushless 1/4 in. Hex 3-Speed Impact Driver is a cordless fastening tool that adds more output control to Milwaukee's compact brushless M18 impact-driver platform. Milwaukee lists a brushless motor, up to 3,600 RPM, up to 4,900 IPM, a 4.4 in. body length, and a 1.7 lb bare-tool weight. The 3-speed layout is intended to give users better control across lighter fastening, finish work, and general structural fastening. This tool-only version is aimed at users already running M18 batteries.

identifiers stable · addressable
Model no.
3651-20
Brand
Milwaukee
Category
Impact Driver
Canonical URL
/milwaukee/impact-driver/3651-20-m18-compact-brushless-1-4-hex-3-speed-impact-driver/
20 spec rows · each row is anchorable

§ Specifications

#specifications
Product Type
Impact Driver
Voltage (V)
18
Cordless / Corded
Cordless
Power Source
Battery
Motor Type
Brushless
Tool Only
Yes
Batteries Included
0
Charger Included
No
Piece Count
1
Length (in.)
4.4
Weight (lbs)
1.7
Battery Platform
M18
Chuck Type
Hex
Chuck Size (in.)
0.25
Max Speed (RPM)
3,600
Maximum Ipm
4,900
Speed Settings
3
Hammer Function
No
One Key Enabled
No
Warranty
5-year limited

§ What's Included

01 (1) M18 Compact Brushless 1/4 in. Hex 3-Speed Impact Driver (3651-20)

§ Warranty

5-year limited

§ FAQ

Does the 3651-20 include a battery or charger?

No. The 3651-20 is sold as a bare tool.

What is the benefit of the 3-speed layout?

It gives users more control across different fastening tasks than a single-speed compact impact driver.

What size bits does the 3651-20 take?

It uses standard 1/4 inch hex impact bits.