Impact wrenches / Compared

Milwaukee 2855-20vsDEWALT DCF921B

Two impact wrenches, compared from their makers' published US specs. Specs checked 2026-10-18. Makers do not always rate the same way, so treat cross-brand figures with care.

Comparing the Milwaukee 2855-20 (BARE TOOL) and DEWALT DCF921B (BARE TOOL) (Milwaukee M18 vs DEWALT 20V MAX): across 11 specs published for both models, 6 differ and 5 match, while 4 specs are published by only one maker and not assumed for the other. Key distinction: Different battery systems: Milwaukee M18 vs DEWALT 20V MAX. Batteries and chargers do not interchange. All figures are from published US manufacturer specs and operator manuals, not hands-on testing.

Milwaukee 2855-20

BARE TOOLMilwaukee M18

Max torque 250 ft-lbsMax breakaway torque 250 ft-lbs (Milwaukee: nut-busting torque)Max speed 0-2,400 RPM

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DEWALT DCF921B

BARE TOOLDEWALT 20V MAX

Max torque 300 ft-lbsMax breakaway torque 450 ft-lbsMax speed 2,500 rpm (the same DEWALT table also says 2800 rpm no-load speed)

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How to choose between them

Already own Milwaukee M18 batteries? The 2855-20 uses them; the DCF921B needs DEWALT 20V MAX batteries and a charger.
Already own DEWALT 20V MAX batteries? The DCF921B is the one that fits what you have.
Starting from nothing: this is a battery-system choice more than a tool choice; compare the kit versions (2855-22, DCF921P2), which add batteries and a charger.
Evidence boundary: 4 spec rows are published by only one maker in the table below; unstated figures are treated as unknown rather than assumed.

From the published figures only; no testing. Rated figures from different makers are not measured the same way.

Where they differ

Different battery systems: Milwaukee M18 vs DEWALT 20V MAX. Batteries and chargers do not interchange.
DEWALT DCF921B: more torque (300 ft-lbs vs 250 ft-lbs).
DEWALT DCF921B: more breakaway torque (450 ft-lbs vs 250 ft-lbs (Milwaukee: nut-busting torque)).
DEWALT DCF921B: higher impact rate (0-3,550 ipm vs 0-3,500 IPM).
Milwaukee 2855-20: shorter (tool length) (4.9 in vs 4.95 in).

6 verified spec differences across 11 specs published for both models (4 specs are listed by only one maker). Stated from the published figures only; no testing.

What they share

Same tool category: both are impact wrenches.
Both are bare tools: no battery or charger in either box.
Matching published specs: Anvil: 1/2 in; Motor: POWERSTATE Brushless; Batteries in box: 0; Battery capacity: None included; Charger in box: No.

Published by only one maker (data gaps)

Weight, tool only: 2855-20 lists 2.4 lb; the DCF921B page lists only DEWALT's assembled-product weight, a package figure we do not compare.
Drive modes: 2855-20 lists 4-Mode DRIVE CONTROL; we hold no matching figure for the DCF921B.
Weight (DEWALT manual figure): DCF921B lists 2.47 lbs; we hold no matching figure for the 2855-20.
Case: DCF921B lists No Case Included; we hold no matching figure for the 2855-20.

A missing value means we have no published figure under that heading for the other model (its maker may not publish it, or may state it differently); we never guess or count an unstated spec as a verified difference.

Every published spec, side by side

Spec	Milwaukee 2855-20	DEWALT DCF921B
Max torque (manufacturer rating)DiffersDCF921B: +50 ft-lbs (+20.0%)	250 ft-lbs	300 ft-lbs
Max breakaway torque (manufacturer rating)DiffersDCF921B: +200 ft-lbs (+80.0%)	250 ft-lbs (Milwaukee: nut-busting torque)	450 ft-lbs
Max speedMaker's wording, not ranked or compared	0-2,400 RPM	2,500 rpm (the same DEWALT table also says 2800 rpm no-load speed)
Impact rateDiffersDCF921B: +50 ipm (+1.4%)	0-3,500 IPM	0-3,550 ipm
Anvil	1/2 in	1/2 in
Weight, tool onlyOnly one listed	2.4 lb	Not on maker page
Tool lengthDiffersDCF921B: +0.05 in (+1.0%)	4.9 in	4.95 in
Motor	POWERSTATE Brushless	Brushless
Batteries in box	0	0
Battery capacity (each)	None included	None included
Charger in box	No	No
Drive modesOnly one listed	4-Mode DRIVE CONTROL	Not on maker page
Anvil typeDiffers	Friction Ring	Hog Ring Anvil
WarrantyDiffers	5 Year Limited Warranty	3 Year Limited Warranty, 1 Year Free Service, 90 Days Satisfaction Guaranteed
Weight (DEWALT manual figure)Only one listed	Not on maker page	2.47 lbs
CaseOnly one listed	Not on maker page	No Case Included

"Differs" marks different published values; pure formatting is not counted. "Only one listed" marks a spec only one maker page gives. Box contents, owner ratings, manuals and sources are on each model's own page: 2855-20, DCF921B. Swap either model in the compare tool.