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 is the difference between an impact driver and impact wrench? Can I use my impact driver as a drill? Comments 0 comments Please sign in to leave a comment.