DEWALT DCF891BvsDCF899B
Two impact wrenches, compared from their makers' published US specs. Specs checked 2026-10-18.
Comparing the DEWALT DCF891B (BARE TOOL) and DEWALT DCF899B (BARE TOOL) on the DEWALT 20V MAX platform: across 12 specs published for both models, 5 differ and 7 match, while 2 specs are published by only one maker and not assumed for the other. Key distinction: DEWALT DCF899B: more torque (700 ft-lbs vs 600 ft-lbs). All figures are from published US manufacturer specs and operator manuals, not hands-on testing.
DEWALT DCF891B
Max torque 600 ft-lbsMax breakaway torque 800 ft-lbsMax speed 2,000 rpm
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Find DCF891B prices on Amazon Find DCF891B prices at eBay Opens the retailer in a new tab; the current price is shown there. Marketplace sellers vary: check the seller and exact model.DEWALT DCF899B
Max torque 700 ft-lbsMax breakaway torque 1,200 ft-lbsMax speed 1,900 rpm
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Find DCF899B prices on Amazon Find DCF899B prices at eBay 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
- Both run on DEWALT 20V MAX batteries, so your existing packs and chargers fit either tool.
- Tight clearance between studs or inside cabinets? The DCF891B publishes a shorter tool head length (6.95 in vs 8-13/16 in on the DCF899B).
- Evidence boundary: 2 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
- DEWALT DCF899B: more torque (700 ft-lbs vs 600 ft-lbs).
- DEWALT DCF899B: more breakaway torque (1,200 ft-lbs vs 800 ft-lbs).
- DEWALT DCF891B: higher top speed (2,000 rpm vs 1,900 rpm).
- DEWALT DCF891B: shorter (tool length) (6.95 in vs 8-13/16 in).
5 verified spec differences across 12 specs published for both models (2 specs are listed by only one maker). Stated from the published figures only; no testing.
What they share
- Same battery system (DEWALT 20V MAX): both tools run on the same packs and chargers.
- 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: Brushless; Batteries in box: 0; Battery capacity: None included; Charger in box: No; Case: No Case Included.
Published by only one maker (data gaps)
- Impact rate: DCF891B lists 0-3,250 ipm; we hold no matching figure for the DCF899B.
- Weight (DEWALT manual figure): DCF891B lists 3.7 lbs; the DCF899B page lists only DEWALT's assembled-product weight, a package figure we do not compare.
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 | DEWALT DCF891B | DEWALT DCF899B |
|---|---|---|
| Max torque (manufacturer rating)DiffersDCF899B: +100 ft-lbs (+16.7%) | 600 ft-lbs | 700 ft-lbs |
| Max breakaway torque (manufacturer rating)DiffersDCF899B: +400 ft-lbs (+50.0%) | 800 ft-lbs | 1,200 ft-lbs |
| Max speedDiffersDCF891B: +100 rpm (+5.3%) | 2,000 rpm | 1,900 rpm |
| Impact rateOnly one listed | 0-3,250 ipm | Not on maker page |
| Anvil | 1/2 in | 1/2 in |
| Tool lengthDiffersDCF899B: +1.86 in (+26.8%) | 6.95 in | 8-13/16 in |
| Motor | Brushless | Brushless |
| Batteries in box | 0 | 0 |
| Battery capacity (each) | None included | None included |
| Charger in box | No | No |
| Anvil typeDiffers | Hog Ring Anvil | Detent Pin Anvil |
| Weight (DEWALT manual figure)Only one listed | 3.7 lbs | Not on maker page |
| Case | No Case Included | No Case Included |
| Warranty | 3 Year Limited Warranty, 1 Year Free Service, 90 Days Satisfaction Guaranteed | 3 Year Limited Warranty, 1 Year Free Service, 90 Days Satisfaction Guaranteed |
"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: DCF891B, DCF899B. Swap either model in the compare tool. copied copied
DEWALT DCF891B
Max torque 600 ft-lbsMax breakaway torque 800 ft-lbsMax speed 2,000 rpm
Paid link: we may earn a commission.
Find DCF891B prices on Amazon Find DCF891B prices at eBay Opens the retailer in a new tab; the current price is shown there. Marketplace sellers vary: check the seller and exact model.DEWALT DCF899B
Max torque 700 ft-lbsMax breakaway torque 1,200 ft-lbsMax speed 1,900 rpm
Paid link: we may earn a commission.
Find DCF899B prices on Amazon Find DCF899B prices at eBay Opens the retailer in a new tab; the current price is shown there. Marketplace sellers vary: check the seller and exact model.Sources
- DEWALT manual for DCF891B (NA874076_DCF891_DCF892_T1_NA.pdf), retrieved 2026-10-18
- DEWALT US product page DCF891B (features), retrieved 2026-10-18
- DEWALT US product page DCF899B (features), retrieved 2026-10-18
Spotted a wrong number? Report a spec error (opens an email with both models filled in). We re-check against the makers' pages and correct the page.
Researched by Rob, licensed electrician (Australia), 18 years on the tools. Found an error? Tell us.
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