Short answer: use an air ratchet wrench to run small and medium fasteners quickly in tight spaces, and an air impact wrench to break loose or drive bolts that need high torque. An air ratchet delivers tens of newton-metres (roughly 20–37 ft-lb on Soartec models); an air impact wrench delivers hundreds of foot-pounds (300–660 ft-lb on the Soartec models below). Most workshops need both.
What is the difference between an air ratchet and an air impact wrench?
An air ratchet wrench uses an air motor to turn a ratchet head directly. It spins at low speed with steady, continuous torque, so it is easy to control and fits into engine bays and assembly fixtures where a socket wrench would be slow.
An air impact wrench uses an air motor to drive a hammer mechanism (for example a twin hammer) that strikes the anvil in rapid blows. Those impacts produce far more torque than a ratchet, which is why impact wrenches are used for lug nuts, suspension bolts and rusted fasteners.
Air ratchet vs air impact wrench: spec comparison
| Model | Type | Square drive | Max torque | Free speed | Air consumption | Weight |
|---|---|---|---|---|---|---|
| WX-2911 | Mini air ratchet | 1/4" | 34 Nm | 320 rpm | 2.3 cfm | 0.46 kg |
| WX-2810 | Air ratchet | 1/2" | 50 Nm | 160 rpm | 9.5 cfm | 1.2 kg |
| WS-2050 | Air impact wrench, twin hammer | 3/8" | 300 ft-lb | 12,000 rpm | 15 cfm | 1.6 kg |
| WS-202 | Air impact wrench, twin hammer | 1/2" | 660 ft-lb | 8,000 rpm | 17 cfm | 2.6 kg |
All four tools are rated at 90 psi. Note the units: ratchet torque is listed in Nm, impact torque in ft-lb (1 ft-lb ≈ 1.36 Nm). The WS-202's 660 ft-lb is about 895 Nm, roughly 18 times the WX-2810's 50 Nm.
When should you use an air ratchet wrench?
- Tight spaces: the WX-2911 is only 132 mm long and suits 6 mm fasteners where an impact wrench will not fit.
- Fast run-down of small bolts: once a fastener is loose, a ratchet spins it out far faster than a hand wrench.
- Controlled, low-torque work: continuous, low-speed torque is less likely to strip small threads than impact blows.
- Small compressors: at 2.3–9.5 cfm, air ratchets use much less air than impact wrenches.
When should you use an air impact wrench?
- Breaking loose seized or rusted bolts: hammer blows deliver torque a ratchet cannot reach.
- Wheel and suspension work: a 1/2" model like the WS-202 covers bolts up to 9/16" (14 mm) standard bolt capacity.
- High-volume fastening: high free speed (8,000–12,000 rpm) means fast cycle times on production and service lines.
- Larger bolts: for heavy equipment, step up to Soartec's 3/4", 1" and 1-1/2" air impact wrenches.
Can an air ratchet replace an air impact wrench?
No. An air ratchet's torque ceiling (tens of Nm) is far below what lug nuts and structural bolts require. The common workflow is to break a fastener loose with an impact wrench (or a breaker bar), then run it out with an air ratchet. Always tighten critical fasteners to spec with a torque wrench.
What size compressor do I need?
Check the tool's air consumption against your compressor's delivery at 90 psi. Soartec air ratchets above use 2.3–9.5 cfm, while the 3/8" and 1/2" impact wrenches use 15–17 cfm. Use the recommended minimum hose size: 1/4" for these ratchets and 3/8" for these impact wrenches.
Quick checklist: which tool should you choose?
- Mostly small fasteners in confined spaces → air ratchet wrench (1/4" or 3/8").
- Lug nuts, suspension and rusted bolts → 1/2" air impact wrench.
- Both kinds of job → one of each; they complement each other.
FAQ
Is an air ratchet stronger than an electric ratchet?
It depends on the model. Compare the max torque rating rather than the power source. Pneumatic ratchets are typically lighter for their output and run cool in continuous use.
What does "twin hammer" mean on an air impact wrench?
A twin hammer mechanism uses two hammers that strike the anvil on each rotation, giving balanced, high-torque impacts. See our guide to 5 types of hammer mechanism.
Can I use impact sockets on an air ratchet?
Yes. Impact sockets work on a ratchet, but standard chrome sockets should not be used on an impact wrench.
Need help choosing? Soartec® Industrial Tools manufactures pneumatic tools for automotive, assembly and heavy industry. Browse the air ratchet wrench and air impact wrench ranges, or contact us for OEM and distributor enquiries.
