
Milwaukee M18 2656-20
Score: 82/100
Porter-Cable 20V MAX Impact Driver 4 inch
Score: 72/100Rankings

The Milwaukee 2656-20 is an 18V cordless hex impact driver featuring a brushless motor and REDLINK Intelligence for optimized performance. It delivers 1,500 in-lbs of torque with a maximum speed of 2,750 RPM, designed for fastening applications in tight spaces. It is best suited for professional contractors and tradespeople requiring a compact, powerful fastening tool for light to medium-duty tasks.

The Porter-Cable 20V MAX Impact Driver offers a budget-friendly solution for DIYers with 1,400 in-lbs of torque and fast charging capabilities. The brushed motor is a trade-off for the lower price, leading to shorter runtime and potential heat issues during prolonged use. It is best suited for homeowners and light trade pros needing affordable power for occasional tasks.
| Attribute | ![]() | ![]() |
|---|---|---|
1,500 in-lbbest | 1,400 in-lb | |
18 V | 20 Vbest | |
2,750 RPMbest | 2,700 RPM | |
3,450 IPMbest | 3,100 IPM | |
| ↓ lower better | 2.8 lbsbest | 4.7 lbs |
— | 1.5 Ahbest | |
| ↓ lower better | 5.69 inbest | 11.4 in |
1 countbest | 1 countbest |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | ![]() | ![]() |
|---|---|---|
Performance(3) | ||
Maximum Torque (in-lb) | 1500 in-lb | 1400 in-lb |
Maximum Speed (RPM) (RPM) | 2750 RPM | 2700 RPM |
Impacts Per Minute (IPM) (IPM) | 3450 IPM | 3100 IPM |
Support(1) | ||
Warranty Duration (years) | 5 years | 3 years |
Accessories(1) | ||
Includes Battery | false | true |
Build & Design(3) | ||
Tool Weight (lbs) | 2.8 lbs | 4.7 lbs |
Tool Length (in) | 5.69 in | 11.4 in |
Tool Width (in) | 2.93 in | 3.7 in |
Power & Battery(1) | ||
Battery Voltage (V) | 18 V | 20 V |
Features(1) | ||
Chuck Type | 1/4 inch hex quick-connect | 1/4-inch hex |

Products in the top-left offer the best value (high score, low price).

Professional reviewers and manufacturers highlight the Milwaukee 2656-20's brushless 4-pole frameless motor as a key advantage, noting it provides longer life and more power than brushed alternatives. The optimized impact mechanism is praised for delivering maximum power and application speed, enhancing job efficiency.
The provided search results do not contain specific user reviews, ratings, or detailed feedback from everyday consumers.

“plenty of power for DIY screws/bolts”

“good torque”




Professional reviewers highlight the Porter-Cable 20V lineup for its value-driven performance, noting strong torque and adequate runtime in brushed models. They praise the tool's compactness for jobsite productivity but note it is not top-tier for professionals needing maximum power.
Everyday users love the lightweight build and ease of use in tight spaces, finding plenty of power for DIY screws and bolts. Recurring complaints include brushed motor heat-up on prolonged use and shorter runtime compared to brushless competitors.