Air Nutrunners for High-Torque Bolting
A nutrunner is a geared air tool that tightens and loosens large nuts and bolts with steady, continuous torque instead of the hammering blows of an impact wrench. This category features heavy-duty Chicago Pneumatic models with square drives for structural bolting, plus rivet nut and nut setting tools from Astro Pneumatic. Compare drive size, torque output and air consumption on each product page.
Nut Runner Applications and Types
A nut runner is used where bolts are large and torque must build evenly: steel structures and tower flanges, mining and earthmoving equipment, rail track, heavy vehicle wheels and pipe flanges. Smooth output loads the joint more evenly and passes less vibration to the operator than an impact tool.
- Geared high-torque nutrunners: planetary gearboxes multiply motor torque for large fasteners at low speed, with a reaction bar that holds the tool against the turning force.
- Pneumatic nut runner with 3/4 in. drive: higher speed for mid-size structural and flange bolts.
- 1 in. drive models: lower speed and the highest torque for the largest bolts.
Astro Pneumatic rivet nut setters are a separate tool group that sets threaded inserts in thin sheet.
How to Choose a Nutrunner
Size the tool from the joint and the air supply available.
- Square drive size and the sockets you already use.
- Torque range for the bolt size and grade.
- Air consumption against your compressor capacity, with a clean supply from air preparation units.
- Reaction bar position and space around the joint.
Why Buy Nutrunners from Selectum Store Corp
Selectum Store Corp carries Chicago Pneumatic geared tools with 3/4 in. and 1 in. square drives, plus Astro Pneumatic rivet nut setter kits and Onyx parts. Each product name starts with the manufacturer part number and lists drive size, speed, torque and air consumption. Free shipping is marked on qualifying items.
Frequently Asked Questions
How do I check the torque of an air tool?
Run it on a joint simulator or a transducer and compare the reading with the target value, since torque varies with air pressure, hose length and wear. Torque testers handle this check; many shops verify tools at set intervals.
What air supply does a nutrunner need?
A dedicated line sized for the tool's air consumption, with a filter and regulator close to the tool, plus a lubricator if required. Undersized hoses or couplers starve the motor and cut torque, so follow the manual's hose size and inlet pressure. More air tools are listed under pneumatic tools.