An impact driver delivers significantly more torque than a drill / driver, and is less likely to twist your wrist when the fastener stops or binds.
An impact driver delivers significantly more torque than a drill / driver, and is less likely to twist your wrist when the fastener stops or binds. It’s also much less likely to strip the head of the fastener, though you can shear it off. Impact drivers have a spring-loaded, quick-release chuck that accepts 1/4″ hex shank impact-rated driver bits and sockets. You can easily drive lag bolts up to 1/2″ by 6″ (longer for smaller diameter bolts) into structural lumber. Some models incorporate a switch that enables you to set the speed / torque level (low, medium or hard) to match the task at hand. You can purchase an impact driver as a tool only (if you already have extra batteries from the manufacÂturer), in a kit that consists of one or two batteries and charger, or as part of a kit containing other power tools. If most of the work you do is small-scale, where you’ll be using 8- to 10-gauge screws in shorter lengths, opt for a 12V model.
Price: $80 to $500 (tool + battery)
$150 – $545 (kit)
Battery Platform: 12V, 18V (20V MAX)
Speed: 0 – 3,300 RPM
Impacts Rate: 3,100 – 4,000 IPMÂ (impacts per minute)
Torque: 975 – 1,832 in-lbs
Weight: 2.1 to 3.3 pounds
Illustrator: Len Churchill
Get the Most From Your Impact Driver
Bits designed for use with drill / drivers are likely to break when used with an impact driver. Use driver bits and socket sets that are impact-rated.
To avoid wood splitting, particularly split-prone wood, and when screwing near the end of a board, it’s best to drill a pilot hole before sinking the screw.
Impact drivers can deliver conÂsiderable impact force. If your impact driver has a torque/speed switch, use it to match the size of screws you’re sinkÂing – lower torque for smaller diameter and shorter screws.
Impact drivers don’t have clutches. Learn to feather the trigger by pulling on it in short spurts. This protects the screw from the full torque of the impact driver, makÂing it less likely to shear off the head of the screw.
If your impact driver comes with a single battery, buy a second. You’ll always have a fresh power supply ready to go.
