The Metabo HPT NT50AE2M uses 18-gauge brad nails from 5/8 to 2 inches long.[1][2] Gauge describes the nail’s thickness category, while length describes how far it extends; you need to check both when choosing nails for a project.
That range gives you options for different trim and fastening tasks, but the right length depends on the materials and how much holding power the joint needs. For example, a short brad may suit thin trim, while a longer one may be appropriate when fastening thicker material; check your project requirements before loading the nailer. The key specifications below help you compare nail packages and avoid choosing by length alone.
What do 18 gauge and 5/8 to 2 inches mean?
The Metabo HPT NT50AE2M is specified for 18-gauge nails from 5/8 inch to 2 inches long, so check both the gauge and the nail length on the package before you buy. [1][2]
What “18 gauge” tells you
“18 gauge” identifies the nail type listed for this nailer; it is not the nail’s length. [1] When you compare boxes, look for nails described as 18 gauge rather than choosing by length alone. [1]
For example, a package marked 18 gauge and 1-inch nails matches the stated gauge and falls within the tool’s listed length range. [1][2] A box marked with a different gauge does not match the nail type specified for the tool, even if its nails are within the listed length range. [1][2]
What the length range means
The listed 5/8-inch-to-2-inch range refers to the nail’s end-to-end length: the shortest listed nails are 5/8 inch long, and the longest are 2 inches long. [1][2] Use those limits when you read a package, rather than assuming that “2-inch” in the tool’s name is the only length it accepts. [2]
For example, 5/8-inch, 1-inch, and 2-inch nails are within the stated range, provided they are also 18 gauge. [1][2] A nail shorter than 5/8 inch or longer than 2 inches falls outside the listed limits. [1][2]
Check the box before loading
Read the package for two details: 18 gauge and a length between 5/8 inch and 2 inches. [1][2] If either detail falls outside those stated limits, the package does not match the nail specifications listed for this tool. [1][2]
This check helps when product names emphasize just one size. For instance, a box labeled “2-inch” tells you the length, but you still need to confirm that it says 18 gauge. [1][2] Likewise, an 18-gauge label alone is not enough: check that the stated nail length is within the tool’s range. [1][2]
The sources list nail type and length, but they do not provide a complete compatibility list for every brand or nail design. [1][2] When a package gives additional specifications and you are unsure whether it matches, compare them with the tool’s documentation or ask the retailer or manufacturer before loading it.
Which nail length should you choose?
Choose a nail length that the Metabo HPT NT50AE2M supports, then match it to the material and the fastening job. The available evidence does not specify the nailer’s supported length range, so check the tool’s manual or product documentation before buying nails. Without that range, you can’t reliably determine whether a particular length will work in this nailer. For more detail, see . Metabo HPT NT50AE2M vs Senco FinishPro 30XP: Which to Choose?.
Match length to the material
Start with the thickness of the piece you’re fastening and the material behind it. For example, fastening a thin trim piece to a thicker wood backing is a different job from fastening two thicker pieces together. The nail needs to suit the layers being joined, but the specific length depends on your materials and the tool’s supported range.
Think about what the nail is meant to hold. A small trim detail and a joint that needs to stay secure under regular handling may call for different choices. Don’t choose a nail based on the project name alone; note the thickness of each piece and check that the selected nail is both appropriate for the fastening job and within the nailer’s range.
Check before loading the nailer
Read the nail packaging and your tool documentation, and compare their supported length information before you load a strip. If the packaging lists a range, confirm that the nail length you plan to use falls inside the nailer’s stated range. The sources provided here don’t give that range, so they can’t confirm a specific nail length for the NT50AE2M.
A practical example: if you’re attaching trim to a backing board, measure the trim and consider the material it will enter. Then verify the chosen nail length against the NT50AE2M documentation rather than assuming that a length suitable for another project—or another nailer—will work here.
Don’t treat one length as universal
There isn’t enough information here to recommend one nail length for every project or to name a specific supported length for this model. The right choice depends on both the materials you’re joining and the fastening task, while the nailer’s documented range sets the limit on what you can use.
If you can’t find the range in the paperwork, look for the model’s official product documentation or contact the manufacturer before purchasing nails. That extra check helps you avoid buying a length that the tool does not support, while still letting you choose for the thickness and purpose of your particular project.
What should you check before loading the magazine?
Before loading the Metabo HPT NT50AE2M, check that the package says 18-gauge brad nails and that the nails are 5/8 to 2 inches long. [1] [2] Matching both the gauge and length helps you avoid loading a fastener that falls outside the sizes listed for this nailer. [1] [2]
Check the nail package
Look for “18 gauge” on the package, not just a general label such as “finish nails.” The NT50AE2M is listed as an 18-gauge nailer, and the compatible fasteners are described as 18-gauge nails. [1] [2] If you are choosing between boxes, compare the gauge marking first, then confirm the length.
For example, a box marked 18-gauge brad nails is the type to check against the nailer’s stated size range. [1] If the package does not clearly identify the gauge, set it aside until you can verify the details rather than guessing from the nail’s appearance.
Match the nail length
The listed length range is 5/8 to 2 inches. [1] [2] Check the specific length on the package: a 1-inch or 1-1/2-inch nail is within that stated range, while a length shorter than 5/8 inch or longer than 2 inches is outside it. [1] [2]
Do not rely only on the box’s broad product description. Confirm the printed nail length before opening the package or loading the magazine, especially if you have several boxes of different lengths on the bench.
Load and operate it by the instructions
Once you have confirmed the gauge and length, use the nailer’s instructions for loading and safe operation. The available sources identify the nail type and length range, but they do not provide loading steps or detailed safety procedures. [1] [2] Use the instructions supplied for your tool rather than improvising a loading method.
A quick check before each reload can be simple: read the package, confirm “18 gauge,” verify that the length is between 5/8 and 2 inches, and then follow the tool’s loading directions. [1] [2] If the package information is missing or unclear, pause and verify compatibility before putting the nails in the magazine.
Use 18-gauge brads within the listed range
The Metabo HPT NT50AE2M uses 18-gauge brad nails from 5/8 inch to 2 inches long. [1][2] Match the length to the workpiece, then check the nail package before loading the tool so its stated dimensions fit the nailer’s range.
For example, a 5/8-inch brad is at the short end of the listed range, while a 2-inch brad is at the long end. [1][2] Those limits tell you which lengths the tool accepts; they do not, by themselves, identify the right length for every project. Choose a brad that suits the material and task, and confirm that the package specifies 18 gauge as well as a length within the range.
Check the package before loading
Look for the gauge and length on the box or product label. A package marked 18 gauge and 1 inch falls within the listed length range; a package marked with a length shorter than 5/8 inch or longer than 2 inches does not. [1][2] If a listing uses a different product name or model designation, verify that it identifies the NT50AE2 or NT50AE2M before relying on its specifications.
The sources describe the nailer as taking straight brads and list the compatible range as 5/8 inch through 2 inches. [1][2] Use that range as a practical compatibility check, not as a substitute for choosing a nail suited to the joint or trim you are fastening. If you are unsure about a box, compare its printed dimensions with the tool’s stated specifications before loading it.
The key specification to remember is 18 gauge, 5/8 to 2 inches long. [1][2] Before you buy or use a box, match the nail to the task and verify the package dimensions against that range.