Both models feature 550 lf-ft of maximum "Nut-Busting" torque as Milwaukee calls it. However, the M18 has a significant advantage in "Fastening" (running) torque with its 600 lb-ft compared to the ...

With the M18 Fuel Impact Wrench, you’ll have a robust 550 foot pounds of fastening torque and 650 foot pounds of nut-busting torque powered by Milwaukee’s POWERSTATE brushless motor.