Brad nailer or pin nailer — which one do I need?

The two small nailers look similar and are used for genuinely different purposes, and people frequently buy the wrong one. The distinction is not really about the tool at all — it is about what the fastener can do, and the honest answer for a 23-gauge pin is that it holds very little indeed.

Safety

Step by step

1. Understand the 23-gauge pinner.It fires a headless pin about 0.6mm across. The hole it leaves is almost invisible and usually needs no filling. It has essentially no withdrawal resistance and it will not hold anything on its own.
2. Use a pinner as a clamp.Its real job is holding a glued moulding, a bead or a mitre in place while the adhesive cures, in places a clamp cannot reach. The glue is the fixing; the pin holds the position.
3. Understand the 18-gauge brad nailer.A brad is about 1.2mm across with a small head. It holds light trim, beading, small mouldings, back panels and thin stock genuinely on its own, and the head gives it real withdrawal resistance.
4. Accept that a brad leaves a hole to fill.It is small, but it is visible on a painted finish and more so on a stained one. Filling is part of the job.
5. Choose the length by the material.The rule of thumb is that roughly two thirds of the fastener should end up in the receiving piece. Firing a long brad into thin trim over an inconsistent substrate is how they blow out of the face.
6. Step up for skirting and architrave.16-gauge or 15-gauge finish nailers fire a substantially heavier nail, which is what second-fix joinery actually needs. An 18-gauge brad through 18mm MDF skirting into a batten is marginal.
7. Know what is behind before you fire.On a masonry wall a brad will not penetrate and will deflect or bounce. On a stud wall it will pass straight through the board into the void, and possibly into a cable.
8. Pick the power source for how you will use it.Pneumatic is light in the hand but needs a compressor and a hose. Cordless is instantly usable and heavier. Gas-cartridge tools are common on site and less convenient at home.

Tips

• If you are buying one tool for general home use, an 18-gauge brad nailer is the more useful of the two by a wide margin.
• Glue plus pins is a genuinely strong combination for mouldings, and it is how a lot of joinery is actually assembled. Neither on its own is as good.
• Set the depth on a scrap of the same material every time you change stock. Depth that was right on softwood will bury a brad in MDF.

Common mistakes

• Fixing skirting with 18-gauge brads alone — The holding power is marginal for a board that expands, contracts and gets kicked. Use grab adhesive with the brads, or a heavier gauge nailer.
• Expecting a 23-gauge pin to hold anything — A headless 0.6mm pin has almost no withdrawal resistance by design — that is the trade for an invisible hole. Without glue it is not a fixing.

Questions people ask