At one time, air ratchets were few and far between, particularly among everyday enthusiasts.
They were pricey and mostly reserved for pro mechanics. That has definitely changed over the years.
Today, there are many air ratchets to choose from in different price ranges.
Yes, you can buy a $200+ air ratchet, but there are plenty of middle-of-the-road choices that work great priced in the $100 range.
But let’s rewind for a second: Not everyone really needs an air ratchet.
Air ratchets are tools that speed up shop output. Case-in-point are the fasteners used to affix something like a front sway bar. With some cars, you’ll be under there for a long time manually cranking on a conventional ratchet (even longer with an open end wrench) because of all the threads. An air ratchet makes that tedious job easier, speeding it up which allows more time to invest in more intricate work.
The next consideration is this: Most standard 3/8-inch air ratchets are capable of applying about 30-50 foot-pounds of torque. That might not be sufficient to crack open (or seriously tighten) many fasteners. Yes, you can get a high-torque air ratchet, but the cost goes up when you do (sometimes exponentially).
If you have an impact wrench, then the need for a high-torque ratchet goes down and often there is no need for it at all. You simply use the impact for high-torque jobs.
Speaking of drives: You can buy air ratchets in 1/4-inch, 3/8-inch, and 1/2-inch drives.
- 1/4-inch drive air ratchets are best reserved for low-duty tasks.
- A 3/8-inch drive air ratchet works for the majority of light to medium duty tasks on a car.
- Finally, a 1/2-inch-drive air ratchet delivers the performance required for heavy-duty tasks.
When you consider the majority of the fasteners used in a racecar, hot rod, or production line car, and consider the torque needs, the 3/8-inch drive setup is the most common.
The size and output of your compressor will affect the performance of an air ratchet.
For example, most common 3/8-inch drive air ratchets consume 3 to 4.5 cfm of air and mandate 90 psi (constant). Many also require a 3/8-inch minimum line size and are usually equipped with a 1/4-inch NPT thread for the quick-coupler fitting.
Some small 110-volt portable compressors will struggle to keep up because of this. For a shop environment with a capable 220 (240) volt two-stage air compressor (as shown in the accompanying photos), powering an air ratchet or two simultaneously isn’t an issue.
Once you choose an air ratchet that fits your needs, consider the size along with the weight.
A big, heavy tool just isn’t comfortable after sustained use. But on the other hand, a flyweight air ratchet can be troublesome (some mechanics call them “wrist breakers”).
For a point of reference, the pair of 3/8-inch drive Mac tools air ratchets shown in the accompanying photos weigh 1,200 grams each (2.65 pounds each).
They measure 10.25-inches from end to end plus the quick coupler fitting. The overall length works out to approximately 12 inches. Personally, I find these air ratchet dimensions perfect for what I’ve done in the shop (drag race cars, hot rods, street-strip cars and restorations along with motorcycle work).
Another consideration is noise.
Having something like a big air compressor pounding away in the background is one thing, but some air ratchets can really step up the wail. For example, my Mac air ratchets are in the range of 89-90 decibels at full bark (many of the examples at Summit Racing produce similar noise). From our perspective, that’s acceptable since the use isn’t constant (although eight hours straight at 90 db. can contribute to hearing damage).
All air tools benefit from the use of an in-line oiler installed on the air supply line since it increases tool life and keeps the tool oiled under sustained use. The in-line oiler should be regularly checked and filled with air-tool oil.
You can check the adjustment of an in-line oiler by placing a sheet of paper next to the air ratchet exhaust port. Hold the throttle open for approximately 30 seconds. A properly set in-line oiler will show a light stain of oil collected on the paper. Too much oil isn’t good.
If you have to store the air ratchet for an extended period of time, it should receive a generous amount of lubrication at that time (simply oil through the quick coupler fitting).
The ratchet should be run for approximately 30 seconds to ensure oil has been evenly distributed throughout the tool. And the ratchet should always be stored in a clean, dry environment.
As far as recommended oil is concerned, air tool oil is preferred, but in truth many pros are now using Marvel Mystery Air Tool Oil. It works!
It’s easy to see that an air-powered ratchet (or two) can really speed up your productivity in the shop. There are tools for every budget and every application.
Pick carefully and you’ll end up with a piece of equipment that will quickly become one of your “go-to” favorite shop tools. They are, after all, a big-time time saver!
For a closer look, check out the following photos: