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How To Find The Correct Air Staples For A Staple Gun

Why can’t I order staples for my pneumatic stapler by dimension?

Unlike nails, staples are often sold by series, which doesn't tell you much about size. Furthermore, staples are not "one-size-fits-most," contrary to most categories of collated nails. Staples are instead measured not only by leg length and wire gauge, but also by crown width.

Pro Tip: If you’re having trouble deciding on a staple gun, see “Choosing A Staple Gun For Your Project.”

BeA Heavy Wire Stapler

Crown Size

The crown is the bridge, otherwise known as the horizontal part of a staple that joins the legs. Crown sizes are typically segmented into wide, medium and narrow designations. This can become tricky, as some manufacturers measure the inside of the crown, while others measure the outside (or exterior) of the crown.

Staple crown type can vary by application. For example, some staples come with a flat top, while others have a round or "U-shaped" crown. However, we'll take a closer look at the various crown types in a later article.

Leg Length

While a staple series is typically determined by gauge and crown (which we'll cover later in this article), leg length can vary significantly - even within the same series of staple. See the different leg lengths for the 7/16” crown staple, for example, below.

Staple with measurements

There are a couple rules of thumb with regard to staple length:

1. Leg length requirements vary by application type, as well as the base material you are driving the staple into. The staple has to be able to fully penetrate and clasp to form a tight bond.

2. The longer the staple legs, the greater the hold or withdrawal strength.

Pro Tip: Never try to force a staple into the wrong tool. Not only can this create a jam, but it could break the staple or damage the tool.

Getting To The Point

Most staples have chisel points, which taper to a point on both legs. This lets the staple legs drive directly into the base material.

Another variation is the divergent-point staple, where the tips taper to opposing points. This forces the legs to bend outward in different directions. Divergent point staples are more difficult to pull out, providing greater holding power.

Wire Gauge

As with nails, staples are categorized by different wire gauges or thicknesses. Gauge is determined by the wire diameter, a standard set in the early half of the 20th century by American Wire Gauge standards. It might seem counter-intuitive, but the thinner the wire, the higher the gauge number. The smallest gauge staple wire we carry here at Nail Gun Depot is a 23-gauge staple for upholstery applications, while the largest is 9 gauge for wire fence building.

Generally speaking, the thicker the wire gauge, the more rugged the application. For finer applications, like fastening upholstery to a furniture frame, a thinner gauge staple is preferable.

What’s In A Staple Series?

Finally, let’s talk staple series. Is there a rhyme or reason for the different series numbers?

In short, yes, it’s true that tool manufacturers want you to use their staples -- and they do make proprietary fasteners to drive the point. Most staple series are determined by the staple's crown size (width) and gauge (thickness).

One way many manufacturers make staple shopping easier, they may designate a particular "series" of staple that is compatible with their tool. Each staple series makes it easier to find the exact staple you need, without having to know all of the dimensions—or how the crown is measured.

In order to consistently get the right staples for your tool, rely on the staple gun itself. More often than not, staple dimensions are printed on a staple gun's magazine.

Types of Air Staple

Finding The Right Fasteners

To help you find the right series, we’ve created the Fastener Finder tool on Nail Gun Depot. Just choose your stapler brand/model from the drop-down menu, and we'll do the rest.  Even if you’re using an older model of air stapler, we can help identify the correct staples for your tool.

Have other questions? Contact us here.


~ The Nail Gun Depot Team

Leave a Reply


  • clayton ranck October 8, 2018 at 2:50 PM

    Do you have staples for the following? Kn 1840, narrow crown stapler also Lfn164 brad nailer and a Model 4440 brad nailer. The above guns are all Duo Fast older models. I wait your reply. thanks

    • Nail Gun Depot October 9, 2018 at 8:41 AM


      We do! The KN-1840 runs 1800 Series Staples. While Duo-Fast no longer produces these staples, we are able to source the identical match from other comparable vendors.

      I think the second model you are listing is actually the LFN-764, which runs 16 gauge finish nails.

      The Model 4440 runs 18 gauge brad nails.

  • Mariano Urrutia October 16, 2019 at 3:59 AM

    I bought a gun from a yard sale, the name plate is gone out not readable anymore, so by measuring the couple of staples left they are 3/8 crown x1 3/4 leg length, I have gone to some of my hardware stores and I can find the. 375 but not the 1.75 length. Can you help me please, they are NOT round crown

    • Nail Gun Depot October 16, 2019 at 9:40 AM

      We would need a brand and model to help identify the correct series of staple. Could you send a few pictures of the gun to and we'll try to identify the tool you purchased?

  • Robert Cervonayco January 2, 2020 at 6:29 AM

    I am trying to find the right staple for one of my air staplers. The width. Of the staple measures .350 inches. Can you tell me what staple to use

    • Nail Gun Depot January 6, 2020 at 6:27 AM

      Do you know the model of tool? Staples are measured by gauge, crown size and range of length. They are a bit tougher to recommend as compared to nails - without knowing the tool they are intended for.

  • Sara Mazarei February 13, 2020 at 11:42 PM

    Hello ! I am in Italy with my Unicatch long nose staple gun and the measurements are completely different out here. My gun calls for the standard 3/8 crown staple but when I take it into any hardware stores out here they only insist on selling me a new gun. They are telling me their staples will not work in my gun. Help !

    • Nail Gun Depot February 17, 2020 at 6:15 AM

      Being in Italy, the staple measurements may be converted to Millimeters - however - you should still be able to identify the correct fastener based on the staple series defined by your tool's manufacturer. It is possible, depending on the age of your gun, that the staple is no longer available. Take a look at the side of your tool's magazine to see if the manufacturer has any specifications printed. The owner's manual may also shed some light on the subject.

      Our best guess would be the tool uses A11-T50 style 3/8" crown staples, but without more information, it's impossible to recommend with confidence.

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