Drills and hammer drills / Compared

Bosch GSB18V-1330CNvsMilwaukee 2904-20

Two hammer drills, 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.

Bosch GSB18V-1330CN

BARE TOOLBosch 18V

Max torque 1,330 in-lbsMax speed 0-550 / 0-2,200 RPMHammer rate 0-30,000 BPM

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Find GSB18V-1330CN prices on Amazon Find GSB18V-1330CN prices at Acme Tools Opens the retailer in a new tab; the current price is shown there. Marketplace sellers vary: check the seller and exact model.

Milwaukee 2904-20

BARE TOOLMilwaukee M18

Max torque 1,400 in-lbsMax speed Low 0-500 / High 0-2,100 RPMHammer rate High 0-33,000 BPM

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Find 2904-20 prices on Amazon Check the 2904-20 price at Acme Tools Opens the retailer in a new tab; the current price is shown there. Marketplace sellers vary: check the seller and exact model.

How to choose between them

Already own Bosch 18V batteries? The GSB18V-1330CN uses them; the 2904-20 needs Milwaukee M18 batteries and a charger.
Already own Milwaukee M18 batteries? The 2904-20 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 (GSB18V-1330CB14, 2904-22), which add batteries and a charger.

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

Where they differ

Different battery systems: Bosch 18V vs Milwaukee M18. Batteries and chargers do not interchange.
Milwaukee 2904-20: more torque (1,400 in-lbs vs 1,330 in-lbs).
Milwaukee 2904-20: shorter (tool length) (6.95 in vs 8 in).
Both are bare tools: no battery or charger in either box.

11 of 16 listed specs differ or are listed by only one maker. Stated from the published figures only; no testing.

Every published spec, side by side

Spec	Bosch GSB18V-1330CN	Milwaukee 2904-20
Max torque (manufacturer rating)Differs2904-20: +70 in-lbs (+5.3%)	1,330 in-lbs	1,400 in-lbs
Max speedDiffers	0-550 / 0-2,200 RPM	Low 0-500 / High 0-2,100 RPM
Hammer rateDiffers	0-30,000 BPM	High 0-33,000 BPM
Chuck typeDiffers	Keyless	All Metal Ratcheting
Weight, tool onlyOnly one listed	Not on maker page	3.3 lb
Tool lengthDiffersGSB18V-1330CN: +1.05 in (+15.1%)	8 in	6.95 in
MotorOnly one listed	Not on maker page	POWERSTATE Brushless
Batteries in box	0	0
Battery capacity (each)	None included	None included
Charger in box	No	No
Chuck size	1/2 in	1/2 in
CaseOnly one listed	No Case Included	Not on maker page
Warranty	5 Year Limited Warranty (tool)	5 Year Limited Warranty
Speed settingsOnly one listed	Not on maker page	2
Clutch settingsOnly one listed	Not on maker page	16
Weight with batteryOnly one listed	Not on maker page	4.9 lb

"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: GSB18V-1330CN, 2904-20. Swap either model in the compare tool.