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The Milwaukee 2855P-20 is a cordless 1/2-inch compact impact wrench built on the M18 FUEL platform. Its headline is size: 4.9 inches long, which Milwaukee calls the most compact in its class, paired with up to 250 ft-lbs of fastening and nut-busting torque from a brushless POWERSTATE motor. A 4-Mode DRIVE CONTROL adds a 20 ft-lb AUTO SHUT-OFF mode for hand-tight fastening and a Bolt Removal Control that slows the anvil once a fastener breaks loose. It suits mechanics and trades who already own M18 batteries and want a light, short wrench for engine bays, suspension and tight chassis work; rivals like the DeWalt and Makita compact 1/2-inch wrenches trade some length or torque for their own battery ecosystems. The pin detent anvil holds sockets securely but needs a tool to release them, which some owners find slower than a friction ring.
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Rated 4.8 out of 5 across 245 ratings, owners consistently praise the compact size and the torque it delivers for its footprint. The pin detent anvil draws the most complaints, with some users finding socket changes slower than a friction ring.
The Milwaukee M18 FUEL 1/2" Compact Impact Wrench with Pin Detent is a cordless impact wrench built for tight spaces. It is 4.9" long. A POWERSTATE brushless motor delivers up to 250 ft-lbs of fastening and nut-busting torque.
Tri-LEDs surround the anvil to light the work area with fewer shadows. A 4-Mode DRIVE CONTROL system offers preset RPM and IPM levels, selected with a single button on the tool. Mode 4 includes auto shut-off, which applies no more than 20 ft-lbs of torque for hand-tight fastening and helps prevent overtightening. Mode 4 also has bolt removal control. It delivers full torque, then slows the RPMs once the bolt is loosened to prevent fastener drops.
REDLINK PLUS Intelligence electronics enable these controls. They also protect the tool against overloads, overheating and over-discharge. It is a bare tool, so the M18 REDLITHIUM battery pack is not included. It works with all M18 batteries and chargers.
