Impact Wrenches (Square Drive)

A square-drive impact wrench is used to tighten and loosen bolts and nuts with square-drive sockets, for vehicle wheels, metal structures, scaffolding and workshop equipment. The impacts make it possible to free very tight bolts without straining your wrist. It works best with impact sockets, because ordinary sockets can break under repeated blows.

The 1/2 inch drive is suited to medium-sized bolts, with sockets such as those in the 9 to 27 mm kit in the collection. The 3/4 inch drive is for large bolts, such as those of structures or heavy vehicles, and develops much higher torque. In the titles you will find 3/4 inch models with a maximum torque of 2978 Nm. Choose the torque according to the largest bolt you need to tighten.

The pneumatic model runs on a compressor, offers high torque and low weight, but needs an air hose and a suitable compressor. The cordless model is self-contained and moves easily between sites and the workshop. The collection includes both versions, also in kits with sockets. The choice depends on where you work and on the availability of compressed air, as well as on the type of bolt to be tightened.

In the titles of some models you will find the wording HOG Ring, which indicates the socket retention system on the square drive of the tool. It holds the socket in place during work and makes changing it easier. Check that the sockets you use are compatible with the retention system of your model, because not all sockets fit in the same way.

The angle impact wrench has its head bent at 90 degrees, so it works where a straight driver cannot fit: under a bonnet, at the back of a recess or between beams. The collection includes the Makita LXT BL angle wrench, supplied with two 5.0 Ah batteries and a case. For occasional use in tight spaces, first consider the socket size required and the weight of the tool.

Use impact sockets, designed to withstand repeated blows, and not sockets for hand tools. Choose the size according to the nut or bolt to be tightened: in the kits with 10 sockets from 9 to 27 mm you will find the most common sizes. For recessed nuts or nuts in awkward positions you need long sockets. Always check that the length does not get in the way of the connection to the drive.

Rest the tool steadily on the bolt and keep the socket well seated, so that it does not slip and strike your hand. Use a torque suited to the bolt, because an impact that is too strong on a small bolt can break it. Wear gloves, goggles and safety footwear, and watch for recoil when the bolt gives way. With the pneumatic model, check the pressure and the hose before use.