Which is better for lug nuts?

The DCF923B. Its 300 ft-lbs fastening and 450 ft-lbs breakaway torque cover most passenger-car lug nuts, while the DCF903B's 250 ft-lbs may fall short on trucks and seized nuts.

Which is better for tight spaces?

The DCF903B. At 2 lbs it is about 0.77 lbs lighter, which matters when reaching into engine bays and under dashes.

Is the 20V worth the extra $33.66?

Yes if you already own 20V MAX batteries and need the higher torque and 4 speed settings. If you own 12V MAX packs, the DCF903B saves money and weight.

Do either include a battery?

No. Both are bare tools, so budget for a battery and charger if you are not already on that platform.

Which has better owner feedback?

The DCF923B, at 4.6 out of 5 from 68 ratings versus 3.8 out of 5 from 12 for the DCF903B. The 12V sample is small, so treat it as a weaker signal.

Nearly identical. The DCF903B spins at 2,850 RPM and 3,250 IPM against 2,800 RPM and 3,200 IPM for the DCF923B; torque, not speed, separates them.

DEWALT ATOMIC 20V MAX 3/8 in Cordless Impact Wrench with Hog Ring Anvil (DCF923B) vs Dewalt DCF903B 12V Max XTREME Brushless 3/8" Cordless Impact Wrench (Bare Tool)

Buy the DCF923B if you work on lug nuts, suspension bolts or anchors and already own 20V MAX batteries. Buy the DCF903B if you want the lightest 3/8 in impact for interior and under-dash work and own 12V MAX tools. The 20V tool is $138.95 at eBay as of November 4, 2026, and the 12V tool is $105.29 at eBay the same day. The $33.66 gap buys about 50 ft-lbs more fastening torque and a longer track record of ratings.

Today the Dewalt DCF903B 12V Max XTREME Brushless 3/8" Cordless Impact Wrench (Bare Tool) costs $33.66 less at its best price.

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