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Air ratchet vs impact wrench

These do different jobs and the specs make it obvious: 25 ft-lb against 600. The surprise is which one is harder on a budget compressor.

By Ryder M.Last updated Published
An air ratchet and an impact wrench side by side on a bench

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Different tools, not competing ones

An impact wrench delivers rotational hammer blows. The Ingersoll Rand 231C publishes 600 ft-lb maximum at 8,000 RPM with 1,200 blows per minute. Its job is breaking fasteners loose and running them down fast.

An air ratchet is a powered socket wrench. The Ingersoll Rand 105-D3 publishes 25 ft-lb maximum with a 5 to 20 ft-lb recommended working range and 250 RPM free speed. Its job is spinning fasteners in and out where a socket wrench cannot swing.

25 ft-lb against 600 is not a close comparison, and it is not meant to be. A ratchet will not break a lug nut, and an impact wrench will not fit behind an alternator. Most garages that do serious automotive work end up owning both.

Published specifications
Impact wrench (IR 231C)Air ratchet (IR 105-D3)
Max torque600 ft-lb25 ft-lb
Working rangeAdjustable power settings5 to 20 ft-lb
Speed8,000 RPM, 1,200 BPM250 RPM free speed
Average CFM at 90 PSI4.23.0
CFM at load22Not published
Noise99 dBANot published
WeightNot published1.8 lb
Duty in practiceBurst - one second per fastenerIntermittent - ten to twenty seconds
JobBreak loose, run down fastSpin out in tight access

The products

Both, on published specs

Quick picks

#ProductBest forScorePrice
1
A half-inch drive air impact wrench with a socket attached
Ingersoll Rand 231C4.2 CFM avg / 22 CFM at load600 ft-lb at 4.2 CFM average - and 22 CFM at load. The tool that teaches you what 'average CFM' really means.
Lug nuts and suspension bolts on a normal garage compressor4.3/10★★☆☆☆
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2
A compact three-eighths drive air ratchet resting on an engine component
Ingersoll Rand 105-D33 CFM avg / 1.8 lb3 CFM average and 1.8 lb. Lower demand than an impact on paper, harder on your tank in practice.
Fast bolt removal in places a socket wrench cannot swing7.0/10★★★★☆
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3
A compact nano-bodied air impact wrench held over an engine bay
Astro Pneumatic ONYX 18224.8 CFM avg / 3 lb500 ft-lb from a 3.85-inch body at 3 lb. The one to buy when access, not torque, is the problem.
Tight engine-bay and suspension work where a full-size impact will not fit5.5/10★★★☆☆
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Scores are computed from manufacturer-published specs by the rubric on our methodology page. Nothing here has been bench-tested, and we do not publish prices we cannot verify.

Pick 1 - Ingersoll Rand 231C

4.3/10★★☆☆☆

Ingersoll Rand 231C

Best for: Lug nuts and suspension bolts on a normal garage compressor

Verdict

600 ft-lb at 4.2 CFM average - and 22 CFM at load. The tool that teaches you what 'average CFM' really means.

What it does well

  • 600 ft-lb max torque at 8,000 RPM, which is more than any lug nut needs
  • 4.2 CFM average at 90 PSI - a 4 CFM compressor keeps up with real-world use
  • The long-running industry default, so parts and service kits are everywhere

What it will not do

  • 22 CFM at load. Hold the trigger down and no garage compressor on this site will keep up
  • 99 dBA - wear hearing protection, this is not optional
  • Wants a 3/8" minimum hose ID; a 1/4" hose will throttle it
How this 4.3 was calculated
MetricScoreWeightBasis
Air economy4.340%4.2 CFM average at 90 PSI, on a 1.8-6 CFM scale (lower is better)
Handling5.025%No weight published - scored a neutral 5
Noise0.520%99 dBA, on an 80-100 dBA scale
Spec transparency8.015%4 of 5 useful figures published (average CFM, CFM at load, dBA, weight, minimum hose)
A half-inch drive air impact wrench with a socket attached

Licensed stock photo - illustrative of the category, not a photo of this unit

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Published specs

Ingersoll Rand 231C published specifications
Average air @ 90 PSI4.2 CFM
Air at load22 CFM
Performance600 ft-lb max torque, 8,000 RPM, 1,200 BPM
Noise99 dBA
WeightNot published
Minimum hose3/8" ID minimum

Source: Ingersoll Rand 231C impact wrench - product specifications

Pick 2 - Ingersoll Rand 105-D3

7.0/10★★★★☆

Ingersoll Rand 105-D3

Best for: Fast bolt removal in places a socket wrench cannot swing

Verdict

3 CFM average and 1.8 lb. Lower demand than an impact on paper, harder on your tank in practice.

What it does well

  • 3 CFM average at 90 PSI is the lowest automotive-tool figure Ingersoll Rand publishes
  • 1.8 lb and 7.3 inches long - it goes where your hand barely does
  • 25 ft-lb max with a 5-20 ft-lb working range, which is the right range for accessory bolts

What it will not do

  • You hold a ratchet trigger for far longer than an impact trigger, so a 2.6 CFM pancake will fall behind
  • 25 ft-lb will not break a lug nut - this is a removal tool, not a breaker
How this 7.0 was calculated
MetricScoreWeightBasis
Air economy7.140%3 CFM average at 90 PSI, on a 1.8-6 CFM scale (lower is better)
Handling10.025%1.8 lb, on a 1.8-8 lb scale
Noise5.020%No dBA published - scored a neutral 5
Spec transparency4.015%2 of 5 useful figures published (average CFM, CFM at load, dBA, weight, minimum hose)
A compact three-eighths drive air ratchet resting on an engine component

Licensed stock photo - illustrative of the category, not a photo of this unit

Check price on Amazon

#ad Disclosure - we do not publish prices we cannot verify

Published specs

Ingersoll Rand 105-D3 published specifications
Average air @ 90 PSI3 CFM
Performance25 ft-lb max torque, 250 RPM free speed, 5-20 ft-lb recommended range
NoiseNot published
Weight1.8 lb
Minimum hoseNot published

Source: Ingersoll Rand 105 Series mini ratchet - product specifications

Pick 3 - Astro Pneumatic 1822

5.5/10★★★☆☆

Astro Pneumatic ONYX 1822

Best for: Tight engine-bay and suspension work where a full-size impact will not fit

Verdict

500 ft-lb from a 3.85-inch body at 3 lb. The one to buy when access, not torque, is the problem.

What it does well

  • 3.85 inches long and 3.0 lb, with 500 ft-lb max / 350 ft-lb working torque
  • 86 dB published - 13 dB quieter than the full-size class reference
  • Three forward and three reverse power settings

What it will not do

  • 4.8 CFM average is higher than the 4.2 CFM class reference, so it is slightly harder on a small compressor
  • Short bodies trade some hammer mass for access; on badly seized fasteners you will feel it
How this 5.5 was calculated
MetricScoreWeightBasis
Air economy2.940%4.8 CFM average at 90 PSI, on a 1.8-6 CFM scale (lower is better)
Handling8.125%3 lb, on a 1.8-8 lb scale
Noise7.020%86 dBA, on an 80-100 dBA scale
Spec transparency6.015%3 of 5 useful figures published (average CFM, CFM at load, dBA, weight, minimum hose)
A compact nano-bodied air impact wrench held over an engine bay

Licensed stock photo - illustrative of the category, not a photo of this unit

Check price on Amazon

#ad Disclosure - we do not publish prices we cannot verify

Published specs

Astro Pneumatic ONYX 1822 published specifications
Average air @ 90 PSI4.8 CFM
Performance500 ft-lb max / 350 ft-lb working torque, 10,000 RPM free speed
Noise86 dBA
Weight3 lb
Minimum hoseNot published

Source: Astro Pneumatic ONYX 1822 impact wrench - product specifications

The counterintuitive part

The ratchet is harder on your compressor

The ratchet publishes 3 CFM average against the impact's 4.2, so it looks like the easier tool to supply. In practice it is the harder one, and the reason is trigger time.

You hold an impact trigger for about a second per fastener. You hold a ratchet trigger for ten or twenty seconds while it spins a bolt out of a bracket. Total air per fastener is higher for the ratchet, and the draw is sustained rather than instantaneous, so a tank contributes much less.

The practical rule: size your compressor for the ratchet. If a compressor comfortably runs a ratchet at 4 CFM published demand plus a margin, it will handle an impact wrench. The reverse is not true - a 2.6 CFM pancake breaks lug nuts and fades within a minute on a ratchet.

California Air Tools 10020C: what it runs

Delivered flow: 5.3 CFM at 90 PSI. We call a tool covered when delivered flow clears its highest published demand plus a 25% margin.

Runs it (4)

  • Air ratchet, 3/8"Yes - needs 4 CFM, intermittent duty
  • Air ratchet, 1/4"Yes - needs 3 CFM, intermittent duty
  • Air hammer / chiselYes - needs 4 CFM, intermittent duty
  • Impact wrench, 1/2"In bursts only - needs 5 CFM, burst duty

Does not run it (1)

  • Die grinder, 1/4"No - needs 6 CFM, continuous duty

Demand figures from the air tool CFM chart, which cites every one of them.

Our answer

Which to buy first

The impact wrench, almost always. It does the job you cannot do any other way - breaking a torqued or seized fastener - and a breaker bar plus a socket wrench covers what a ratchet does, slowly. Buy the capability you cannot substitute.

Buy the ratchet second, once you have hit the specific frustration it solves: a bolt you can reach but cannot swing a wrench at. When that happens you will know, and 1.8 pounds at 7.3 inches long will feel like a revelation.

Check your compressor before buying the ratchet, though. On a 2.6 CFM pancake it will disappoint you, and that is a sizing problem rather than a tool problem. The smallest unit in our roster that genuinely runs one is a 10-gallon 2 HP machine at 5.3 CFM.

FAQ

Questions people actually ask

Is an air ratchet or impact wrench better?

They do different jobs. An impact wrench at 600 ft-lb breaks fasteners loose; a ratchet at 25 ft-lb spins them out in tight access. Buy the impact first, because nothing else substitutes for breaking a seized fastener.

Can an air ratchet replace an impact wrench?

No. 25 ft-lb maximum against a lug nut's roughly 100 ft-lb means a ratchet cannot break wheel nuts at all. It is a complement to an impact wrench, not an alternative.

Which uses more air, a ratchet or an impact wrench?

Per minute of trigger time the impact uses more. Per fastener the ratchet usually uses more, because you hold its trigger ten to twenty times longer. That is why the ratchet is the tool to size your compressor around.

Will a 6 gallon compressor run an air ratchet?

Briefly. At 2.6 CFM against 3 to 4 CFM of sustained demand you will feel it fade within the first minute. It works for a couple of bolts and frustrates over a job.

Do I need both?

If you do regular automotive work, most people end up with both, and the marginal cost of the second tool is small once you own the compressor and hose. If you only change wheels, the impact alone is enough.

Sources

Where these numbers come from

Accessed September 2026. If a figure on this page does not match the manufacturer's current sheet, tell us at contact@psiandhose.com and we will correct and date the change - see our editorial policy.

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