Chicago Pneumatic CP7331 & CP7332 Ultra-Compact Impact Wrenches - REVIEWED

Barely the size of your fist but offering you 600Nm of reverse torque, Chicago Pneumatic have two ultra-compact impact wrenches that are perfect for use in workshops when you need to access extremely tight spaces.

The wrenches come in two flavours:

Chicago Pneumatic Ultra Compact Impact Wrenches - What's the Spec, Features and Benefits


Tyre fitters, mechanics, car restorers; all of you guys need top quality air-powered impact wrenches, and for many of you Chicago Pneumatic is the first name that comes to mind. The company is famous for the quality of its tools, and it's won awards along the way.

But for some jobs, heavy duty beasts like the CP772H, with all of it's brushes chrome goreousness, won't cut it.

Let's say you're working on a vehicle's trasmission or deep within the engine. A "normal" sized impact wrench will likely struggle to get deep within the area required due to the restricted space.


That's where something as compact yet powerful as the CP7732 or CP7731 is vital.

We asked Carl from Beetlebank, an award winning VW restoration workshop, to explain why he trusts these new tools from Chicago Pneumatic. You can watch his review on Toolstop TV here.

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Weighing in at a mere 2.9lbs or 1.3kg, the CP773* impact wrenches are offering you the best power to weight ratio on the market. The front of the wrench is steel, making it tough and durable as you'd expect. But the body is aluminium, helping to keep that weight down. This makes it extremely comfortable to use, offering you a simple one-handed pistol operation in either the left or right hand.

The key benefit, asides from the low weight but high output of the tools, is the headlenght. As Carl points out, these things are barely the size of your fist, with a headlength of just 112mm.

The idea is a simple one; anywhere your hand can fit, the Chicago Pneumatic CP773* impact wrenches can fit.


Across the 3 forward and reverse positions you have access to between 138 and 420Nm. Whereas in reverse mode you can get all the way up to 610Nm. Into the bargain you're getting 1400 blows per minute giving you both the grunt, and the torque control via the pistol trigger, for even the toughest nuts, while it spins at 9000rpm.

It's because of world-class spec like this that Carl describes the CP773* impact wrenches as "one of my favourites in the Chicago Pneumatic range".

Partner a CP7731 or CP7732 with something like the CP9780 heavy duty belt sander, with its compact and adjustable head, and you've got kit that'll enable you to quickly, efficiently and capably work in the tightest areas when performing vehicle or engine repair and maintenance.

In terms of how they perform on an airline, here's the spec:

  • Average air consumption: 2.4 l/s 5 cfm
  • Actual air consumption: 9 l/s 19.6 cfm
  • Air inlet thread size: 0.25 "
  • Min. hose size: 10 mm / 3/8"

What's your favourite go-to air tools for working in confined spaces? Let us know in the comments section below.

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