Buy Air Impact Wrenches Online in Australia
Air Impact Wrench Selection — Quick Reference
Pneumatic impact wrenches use ROTARY HAMMER mechanism delivering HIGH-TORQUE OUTPUT IN BURSTS — removing + tightening fasteners production speed. Workshop + automotive + truck + heavy machinery + production.
| Air Impact Wrench Type | Best For | Typical Torque |
|---|---|---|
| 1/4" Drive Impact | Small + light fasteners | 50-100 Nm |
| 3/8" Drive Impact | Light automotive + workshop | 200-400 Nm |
| 1/2" Drive Impact | Standard automotive — workshop default | 700-1,500 Nm |
| 3/4" Drive Impact | Heavy truck + plant | 1,500-3,000+ Nm |
| 1" Drive Impact | Heaviest industrial + mining | 3,000-7,000+ Nm |
| Reversible | Tighten + loosen | — |
| Variable Torque (Adjustable) | Range of fasteners | — |
| Air Supply (90-100 psi) | Industrial compressor | — |
Critical: USE IMPACT-RATED SOCKETS ONLY — chrome sockets SHATTER under impact. Match drive size to fastener + torque. PPE — eye + ear protection mandatory. Brands: Sutton Tools, Maxigear, Trax. Companion: pneumatic tools, impact sockets + bits, air ratchets.
Air Impact Wrenches
Pneumatic impact wrenches use a rotary hammer mechanism to deliver high-torque output in bursts — removing and tightening fasteners far faster than a ratchet or conventional wrench. AIMS Industrial stocks air impact wrenches from Trax in 1/2", 3/4" and 1" drive configurations for mechanical, tyre, heavy equipment and industrial fastening applications.
Drive Size Selection
- 1/2" drive — the standard for automotive, light truck and general workshop use. Handles wheel nuts, suspension bolts and most mechanical fastening up to M20 in most materials. Compact and light enough for sustained overhead use.
- 3/4" drive — for heavy vehicle wheels, agricultural equipment, mining machinery and structural steel fastening up to M30. Substantially higher torque output than 1/2" drive.
- 1" drive — for the heaviest fastening applications on large equipment, where torque requirements exceed what 3/4" drive can reliably deliver.
Torque and Speed
Air impact wrench performance is defined by maximum torque (Nm) and free-speed (RPM). Higher free-speed increases fastening speed; higher torque rating determines the maximum fastener size that can be reliably removed. Most quality 1/2" air impact wrenches deliver 400–700 Nm — sufficient for all automotive applications and most industrial fastening.
Air Supply Requirements
Air impact wrenches require a minimum air supply of 170–200 L/min (6–7 CFM) at 90 PSI (6.2 bar). Undersized compressors or undersized air hose will reduce output torque significantly. For guidance on air supply requirements for your impact wrench, contact our team. AIMS Industrial has been supporting Australian workshops since 1988.
People Also Ask — Air Impact Wrenches
Q: What's the difference between an impact wrench and an impact driver?
An impact wrench delivers high rotational torque through a square drive for removing and installing nuts and bolts — the tool for wheel nuts, chassis bolts and structural fastening. An impact driver uses a hex quick-release chuck for screws and drill bits, delivering less raw torque but faster rotational speed, suited to screw-driving and light drilling rather than high-torque bolt work. Match the tool to the fastener: hex-shank screws and bits call for an impact driver, square-drive sockets and nuts call for an impact wrench.
Q: What size air impact wrench do I need for automotive wheel nuts?
A 1/2" drive impact wrench is the standard for automotive and light truck work, delivering roughly 700-1,500Nm — enough for wheel nuts, suspension bolts and most mechanical fastening up to M20. For heavy truck wheels, agricultural or mining equipment, step up to 3/4" drive (1,500-3,000+Nm); for the heaviest industrial and mining fastening, 1" drive delivers 3,000-7,000+Nm.
Q: What air pressure does an air impact wrench need to run properly?
Most air impact wrenches are rated for 90-100 psi supply pressure from an industrial compressor. Running below the rated pressure reduces torque output significantly, so match your compressor's delivered pressure, not just tank pressure, to the tool's requirement, especially on larger 3/4" and 1" drive wrenches that draw more air volume.
Q: What does variable torque mean on an impact wrench?
A variable (adjustable) torque impact wrench lets you dial back the output for smaller fasteners or delicate work, then increase it for heavier fastening — useful where a single tool needs to handle a range of fastener sizes without over-tightening the smaller ones. All air impact wrenches should be reversible, so the same tool tightens and loosens.