What are the specifications of the DW977 12v Impact Driver? Wilson October 30, 2020 18:00 Updated Follow The specs on the DW977 12v Impact Driver are: Maximum torque is 850 inch lbs. Impacts/Min 0-2600 BPM RPM's 0-2000 No Load Speed 1/4" hex drive chuck for fast, easy bit changes Related articles What are the speed and torque numbers for the DEWALT DCF899 Impact Wrench? What is the difference between MAX, XR, and ATOMIC? What is the difference between an impact driver and impact wrench? What is the max RPM and torque on the DEWALT DCF787 impact driver? Can I use my impact driver as a drill? Comments 0 comments Please sign in to leave a comment.