*Lithium socket machine* = a cordless impact wrench or ratchet that runs on lithium-ion batteries.
Basically "socket machine" is shop slang for an impact wrench/gun that uses sockets to tighten and loosen bolts.
*Key specs*:
- *Power source*: Lithium-ion battery packs, usually 12V, 18V/20V, or 24V/36V. No cord, no air hose
- *Drive sizes*: 1/4", 3/" drive is the most common for auto and construction
- *Torque*:
- *Impact driver*: 100-250 ft-lbs. For screws and small bolts
- *Mid-torque impact wrench*: 300-600 ft-lbs. Lug nuts, suspension work
- *High-torque impact wrench*: 700-2000+ ft-lbs. Trucks, heavy equipment
- *Speed*: RPM and IPM/BPM. Impacts Per Minute is what breaks bolts loose
- *Features*: Variable speed trigger, LED light, multiple modes, brushless motor for longer battery life