Last updated on February 27th, 2021 at 11:23 am
Air needle scalers are used for metal surface preparation. Its main use is to remove old paint, rust, dirt and weld slag from metal surfaces.
It’s used heavily in shipyards for cleaning off hardened dirt and rust from large iron ships that comes to the yard. They’re also used for cleaning and maintenance of tractor parts.
Welders use them for removing welding slag and they’re also used in automobile repair shops for removing old paint from rusted auto parts and other metal surface preparation tasks.
An air needle scaler can also be called a needlegun scaler or a needle gun, depending on what you already know it as.
Although there’re electric needle scalers, I’ve covered the pneumatic or air compressor powered ones in this article.
How it works
The needle scaler comprises a set of very fine chisels which are known as the needles. When connected to a compressed air source, the tool forces these needles against the metal surface it’s applied on at variable speeds up to around 5000 times per minutes measured in BPM (Bumps Per Minute).
These needles moving at these speeds force chips of every dirt, rust and old paint off the surface. We’ve reviewed several models of air needle scalers in this article with each of them offering different numbers of needles, operating speeds and power levels.
There are other methods of scaling or removing rust, old paint and other foreign materials off the surface of metal, but the needle scaler has advantage over the rest because each of the needles adjusts itself to the contours of the material being cleaned, which makes it ideal for scaling irregular surfaces.
Before using the needle scaler on any surface however, it’s important to prepare the surface first by removing any greese, chemicals, oil and any water-soluble contaminants.
This you can do with solvents or a combination of fresh water and ditergent.
To start scaling the surface, hold the needle scaler at an angle of 45 degrees to the work surface and work it across the surface, taking care not to cover too large an area at once.
About 2 or 3 passes over a 6 or 8 inch area is usually enough to clean that area. Then you can move on to another area and so on.
With that said, here are 7 of the best air needle scalers you can use for metal surface preparation.
1. Chicago Pneumatic CP7125 Pistol Grip Needle Scaler
Among all the air needle scalers reviewed in this article, this Chicago Pneumatic CP7125 pistol grip needle scaler is probably the one that will give you the most value for your money.
This scalers does not come with just one set of needles but comes delivered with 2 sets of scaling needles.
One set of 19x3mm needles you can use for standard duty work and another set of 29x2mm scaling needles for finer usage.
With this Chicago Pneumatic needle scaler, you have a power scaler in hand to perform light/heavy duty metal surface preparation work.
The scaler features a pistol grip handle that allows you a secure hold on it and the rubber sleeve covering the handle provides all the comfort you need as you work with the tool.
All in all, if you’re looking for a top-end air needle scaler with the best value for your money, this Chicago Pneumatic needle scaler should be at the top of your list.
2. Ingersoll Rand 125 Series Standard Duty Needle Scaler
This Ingersoll Rand 125 Series standard duty needle scaler comes out as one of the best pneumatic scalers we’ve seen.
You can use it for any kind of surface preparation work involving paint removal, rust removal, dirt and weld slag removal.
Apart from being extremely useful, the 125 Model Ingersoll Rand needle scaler is also very durable and dependable in the workshop.
The scaler comes equipped with 19 precision heat-treated needles which allows you to use it in the maximum capacity possible.
It works at a free speed of 4600 blows per minute, allowing you to fly through any project you’re tackling with it.
Adjusting the tool requires no special tools thanks to the adjustable bayonet-type needle housing it features.
Overall, this Ingersall Rand air needle scaller is definitely one scaler among many out there that will allow you to work at the highest level in any metal fabrication workshop.
3. Sunex SX246 Pistol Grip Needle
With speed up to 4500 blows per minute, this Sunex SX246 pistol grip air needle scaler delivers the speed you need to rid any metal surface from old paint, rust, dirt and weld slag.
It comes equipped with 19 hardened steel needles that are not only tough but also durable, which will ensure the tool stays with you for a long time.
The pistol grip handle design ensures you’re able to hold the scaler securely and control it comfortably while scaling metal surfaces with it.
The aluminum housing not only provides durability but also ensures you’re not handling excess weight as you use the scaler.
All in all, there may be many other pneumatic needle scalers out there, but this one from Sunex definitely holds a good ground among them all.
4. Powermate Vx 024-0299CT Air Needle Scaler
If you’re looking for a budget-friendly but effective and durable air needle scaler you can use for metal surface preparation involving rust, paint, dirt and weld slag removal, then this one from Powermate is a very good option I can recommend.
The Powermate VX 024-0299CT Air needle scaler is a top-quality needle scaler that you can get for a fraction of the price the other top models goes for.
But don’t let the price dissuade you from pulling the trigger on this one. Just like the rest, it comes with 19 steel needles for effective metal surface preparation.
The soft pistol grip offers you a firm hold on the tool, allowing you to control it just the way you want. Featured also is a handle exhaust which directs heat away from the work surface so as not to alter the material in any way.
With speed up to 4500 bumps per minute, this Powermate pneumatic needle scaler is capable of handling any scaling job you have for it, whether you work in a shipyard, automobile workshop or any other metal fabrication or surface prep shop.
5. Goplus Compact Air Needle Scaler
This compact in-line air needle scaler from Goplus is another budget-friendly yet very effective and durable needle scaler you can use to get your metal surface preparation job done in quick and neat fashion.
Equipped with 19 hardened steel fine chisel needles, you can even apply it on uneven rusty metal surfaces while working at optimal speeds.
The Goplus pneumatic needle scaler is capable of function at a speed of 5000 BPM, allowing you to remove even the most stubbon of old paint, rust, weld slag and dirt on rusty ship hulls.
This needle scaler weighs just 6.5 lbs which is quite light, allowing you to use it for long periods without hand fatigue. It’s constructed with a durable metal frame coated with electrophoresis for durability.
It’s easy one-trigger-operation and adjustable bayonet-type needle housing lock makes it very easy to use in whatever task you need it for.
It consumes 4.5 SCFM of air at a minimum pressure of 90 PSI.
Overall, if you’re looking for a good quality and effective air needle scaler you can use for welding applications, home repair, shipyard applications, automotive and other metal surface preparation applications, this needle scaler from Goplus is one very good option you can go for without breaking the bank.
6. Chicago Pneumatic CP7120
Producing needles speed up to 4800 blows per minute, this is another highly effective needle scaler from Chicagle Pneumatic you can use for welding applications, shipyard rust and dirt removal and other metal surface scaling work.
It features an adjustable sleeve that allows you to adapt the protrusion of the needles depending on the application.
Equipped with high wear resistant steel needles, you can be rest assured the tool will not fail on the job before its time is up.
The Chicago Pneumatic CP7120 is not just an air needle scaler, but it easily converts to a weld flux chipping hammer to widen the application of the tool.
Needless to say, it’s a two-in one tool you can use for a host of heavy duty metal surface preparation applications.
All in all, the Chicago Pneumatic CP7120 is effective, tough and durable, making it one of the best scalers you can employ for your projects.
7. Astro 4320 In-Line Needle Scaler
This needle scaler from Astro Pneumatic Tools comes with just 12 high tension steel needles, not 19, but they work extremely well for metal surface preparation especially in removing weld slags, old paint and dirt.
It produces up to 4200 blows per minute of speed, making it highly effective for any metal surface work you need it for.
The scaler weighs just 12-1/3 lbs which is not heavy especially for the purpose it’s intended for.
It’s an in-line needle scaler which means it does not offer you the perfect grip and control and pistol grip offers but instead it allows you to reach into tiny spaces where a pistol grip needle scaler may not be able to reach.
Overall, this Astro 4320 In-line Needle scaler is one of the best scalers you can get today for metal surface scaling and preparation.