A half inch drive impact wrench is one of the cheapest things on a tool counter, roughly $20 to $40 a day, and the decision that matters is what drives it. An air gun needs a compressor, which costs more to hire than the wrench itself. A cordless or corded electric gun needs nothing but a socket set and a charged battery.
The compressor is the real hire on an air gun
Pneumatic wrenches are light, powerful and cheap, and completely useless without air. A half inch gun wants a compressor that will sustain its air demand rather than one that keeps up for ten seconds and then gasps. Add $40 to $80 a day for a portable unit, plus hose, and the electric option starts looking sensible.
Match the torque to the fastener, not to the badge
Manufacturers quote a headline breakaway figure that is not the working torque you will see. Wheel nuts, trailer hardware and suspension bolts sit well inside what a mid range half inch gun does; large structural or agricultural fasteners want three quarter inch drive. Tell the counter the biggest nut you have to move.
Impact sockets are not optional
Chrome hand sockets crack and shatter under impact, which is a genuine injury risk rather than a warranty matter. Hire or buy black impact rated sockets and an impact extension to go with the gun. Counters normally rent the set alongside the wrench, so ask for the sizes when you book rather than raiding a toolbox.
When hiring beats buying, and when it does not
One weekend of work on a trailer or a vehicle is clearly a hire. A run of jobs over a month is not, since a few days of rate approaches the cost of a serviceable cordless gun. The counter is there for the one off and for the size you will never need again.
Questions people ask about 1/2 impact wrench rental
Will a 1/2 inch impact wrench remove rusted wheel nuts?
Usually, with penetrating oil and a little patience, and a mid range gun handles ordinary car and light truck nuts easily. Seized agricultural or heavy truck hardware may need a larger drive size. Never lean on an impact gun with an extension bar; that is how sockets and knuckles get broken.
Do I need to bring anything with an air gun?
Air tool oil, a hose of the right size and fittings that match the yard's connectors. Ask what coupler type the compressor uses so you are not adapting on the job. Some counters include the hose in the compressor hire and some charge it separately.
Can I use it to tighten to a spec?
No. Impact wrenches are for removal and for running fasteners down, not for final torque. Anything with a specification, wheel nuts included, is finished with a torque wrench by hand. Yards rent torque wrenches too, and the two tools are usually hired together for this reason.