CRAFTSMAN CMCF900M1 1/2" Cordless Impact Wrench with 4Ah Battery

This 20V cordless impact wrench from Craftsman brings high torque and portability to workshops and job sites, helping remove stubborn fasteners quickly while keeping control during delicate operations. With a brushless motor and a high-capacity 4Ah battery, it balances power and runtime for tasks like automotive repair, construction maintenance, and heavy equipment work.

Key Points

The tool delivers up to 350 ft-lbs of torque and reaches 2,500 impacts per minute, which helps break loose tight bolts and lug nuts with fewer attempts. Variable-speed trigger allows fine control up to about 1,700 RPM, so you can start slowly for alignment and ramp up when more speed is needed. An LED work light improves visibility in dark engine bays or under vehicles. Consider that peak torque figures are according to the manufacturer, and real-world performance may vary with fastener condition and socket fit.

Technical Specifications

• Name: Craftsman CMCF900M1 V20 RP 1/2 inch Cordless Impact Wrench Kit
• Motor type: Brushless
• Drive size: 1/2 inch (1.27 cm)
• Maximum torque: 350 ft-lbs
• Impacts per minute: 2,500 IPM
• Battery: 20V MAX 4 Ah lithium-ion

How to Use It

Start with the variable-speed trigger for precise fastening. Use lower RPM to seat bolts or for delicate threads, then increase throttle for removal of seized hardware. The included fast charger restores the 4Ah pack in about 60 minutes, which helps keep downtime to a minimum on busy days. The ring anvil design simplifies socket changes, and the tool is compatible with Versatrack hooks for organized storage on a wall system.

Advantages

Brushless operation reduces maintenance and tends to run cooler while offering improved efficiency and longer motor life. The combination of 350 ft-lbs of torque with 2,500 IPM gives a strong balance between impact force and speed, useful for both loosening and tightening. The 4Ah battery supplies extended runtime for repeated heavy-duty use without frequent recharges. Also, the compact 1/2 inch drive keeps the head size reasonable for working in tighter spaces.

Practical Tips

Use quality impact-rated sockets to avoid rounding fasteners and to transfer torque efficiently. If you must torque bolts to a specification, finish with a calibrated torque wrench rather than relying on the impact wrench for final accuracy. Store the battery at moderate temperatures and avoid fully discharging it repeatedly to help preserve capacity over time. Note that while the LED helps in low light, consider supplemental task lighting for precision work.