If you are buying one nailer for woodworking, buy an 18-gauge brad nailer. If you are buying a second, make it a 16-gauge finish nailer. A brad is thin enough that the hole disappears under a finish and strong enough to hold parts together while glue cures, which is what a nailer does in furniture work. A finish nailer holds a joint on its own, which is what trim carpentry needs and what cabinetry occasionally needs. The Metabo HPT NT50AE2 is our brad pick, the Metabo HPT NT65M2S the 16-gauge pick, and the NT65MA4 the 15-gauge pick if the work is door casing and baseboard.
The difference is one number
Gauge is wire diameter, and it runs backwards: the bigger the number, the thinner the nail. An 18-gauge brad is thin. A 16-gauge finish nail is thicker. A 15-gauge finish nail is thicker still. Everything else — holding power, hole size, how much splitting you risk in a narrow edge, which compressor you need — follows from that one specification.
“Brad nailer” means 18-gauge in current usage. “Finish nailer” means 15 or 16-gauge. There is also a 23-gauge pin nailer below the brad, which drives a headless pin that holds almost nothing and leaves almost no mark — useful for holding a small molding while glue grabs, useless for anything structural. The three sizes are a continuum of the same trade: holding power on one side, a hole you have to fill on the other.
Which one woodworking actually wants
A furniture maker uses a nailer differently from a trim carpenter. In furniture work the joint is glued, and the nail is a clamp — it holds parts in register for the minutes or hours the glue needs, and contributes little to the finished strength. A glued joint is stronger than the wood around it; the fastener is scaffolding. For that job a brad is ideal, because it holds enough and leaves a hole you can ignore on anything but a show surface.
Trim carpentry is the opposite. A baseboard nailed to a stud has no glue line, so the nail is the joint and it has to resist the board pulling away as the house moves. That takes a 15-gauge nail, and the hole gets filled and painted. The reason the category is confusing is that both tools get sold to both audiences as if the choice were about size rather than about whether there is glue in the joint.
So the honest answer for a woodworker building cabinets, boxes and furniture: an 18-gauge brad nailer covers nearly everything, and the second purchase should be a 16-gauge for face frames, cabinet backs and the occasional piece of trim. A 15-gauge is a trim tool that happens to be sold next to the others. Our brad nailer roundup ranks the 18-gauge field in full.
What each gauge holds, and what hole it leaves
A thicker nail holds more because there is more steel in shear and more friction along the shank. That is why a 15-gauge nail can hold a door casing with no glue and a brad cannot. The cost is proportional: the hole a 15-gauge nail leaves is large enough that it needs filling before any clear finish, and large enough to split a narrow edge if you nail too close to the end.
The brad is the reverse. The hole closes up enough under oil or shellac to be genuinely hard to find, and 18-gauge steel is thin enough to go into a 3/4 in. edge without splitting it most of the time. What it cannot do is hold anything that will be stressed. A brad-nailed butt joint with no glue is a joint waiting to come apart, and nobody should be surprised when it does.
Straight or angled magazine
Brad nailers are almost always straight. Finish nailers come both ways, and the difference is reach rather than performance. A 34-degree angled magazine lets the nose get into an inside corner that a straight magazine cannot reach, because the body of the tool clears the adjacent surface. 15-gauge tools are typically angled, 16-gauge tools come either way.
The trade is that an angled tool is bigger and the nail leaves the nose at an angle you have to allow for when you are placing it precisely. For bench work — where you are usually holding a part with your other hand — a lighter straight tool is easier to aim. For installed trim, angled is worth the bulk. Nails are not interchangeable between them: a 34-degree angled magazine takes angled collated strips, and straight tools take straight ones.
Pneumatic or cordless, and what the compressor costs
A pneumatic nailer is lighter, cheaper and more reliable than a cordless one, and it needs a compressor, a hose and floor space. A cordless nailer costs roughly twice as much, weighs more and removes all three. The honest arithmetic is: if the compressor would exist only to run the nailer, cordless is usually the cheaper and better answer once you price the hose and the space. If you already have air, or want it for other reasons, pneumatic wins on every other axis.
One thing to size correctly if you go pneumatic: a finish nailer uses appreciably more air per shot than a brad nailer does. Metabo HPT publishes 0.045 cu. ft. per cycle at 100 psi for the 15-gauge NT65MA4, which is more than the smallest 1-gallon quiet compressors deliver continuously. Our air compressor roundup covers what each class of compressor can actually feed.
Prices below come from our live price feed and carry the date they were pulled. Picks one and four are 18-gauge brad nailers; picks two, three, five and six are finish nailers, so you can buy either side of the argument from the same ranking.
Brad against finish, side by side
Published specifications for the three gauges, from the manufacturers' own listings for the tools ranked above.
| 18-gauge brad | 16-gauge finish | 15-gauge finish |
|---|
| Typical nail range | 5/8–2-1/8 in. | 1–2-1/2 in. | 1-1/4–2-1/2 in. |
| Holding power | Lowest — a clamp, not a joint | Holds a glued joint on its own | Holds an unglued joint |
| Hole to fill | Often none under a finish | Small, fills easily | Needs filling before clear finish |
| Magazine | Straight | Straight or 34° angled | Usually 34° angled |
| Split risk in a narrow edge | Low | Moderate | High |
| Air per shot | Not published; materially less than a 15-gauge | Not published for the NT65M2S | 0.045 cu. ft./cycle at 100 psi |
Which tool for which job
| Job | Gauge | Why |
|---|
| Holding a glued miter while it cures | 18 | The glue is the joint; the nail only has to stop it sliding |
| Cabinet back into a rabbet | 18 | Thin stock, no load, and the hole is never seen |
| Face frame to a carcase | 16 | Needs to resist being pulled off while the glue sets |
| Shoe molding and small trim | 18 or 16 | 16 if it has to stay put without glue, 18 if it is glued |
| Door casing, baseboard, crown | 15 | No glue line, real movement, needs the thickest nail |
| Small molding you cannot clamp | 23 pin | Invisible, holds nothing — a third hand, not a fastener |
Nails are not an afterthought
Collation is where people get caught. An angled magazine takes angled strips at the magazine angle; a straight magazine takes straight strips. Buying the wrong box is a common and annoying mistake, and the strips are not convertible. Check the angle printed on the tool before ordering nails, and buy the gauge and the collation together.
Length matters more than it looks. The working rule for a nailer is that at least two-thirds of the nail should be in the part you are fastening to, which for 3/4 in. stock into 3/4 in. stock means something in the 1-1/4 in. to 1-1/2 in. range. Longer is not better: a nail driven near the end of a board is more likely to split it, and a nail that is too long for the joint finds its way out the other face.
Safety: the trigger mode is the decision
Both tool types usually offer two actuation modes. Sequential requires the nose to be pressed and then the trigger pulled, one nail per pull. Contact (or bump) firing drives a nail every time the nose touches something while the trigger is held. Contact firing is faster across a floor and it is the mode tied to unintended discharges — OSHA and NIOSH both single it out.
For bench woodworking there is no reason to use it. You are not nailing hundreds of feet of sheathing, your other hand is frequently within a few inches of the nose, and the time saved is nothing. Set the tool to sequential and leave it there. Keep the spare hand well back from the nose regardless, because a brad hitting hard grain can deflect and come out the side of a board.
Where a nailer is the wrong tool
A nailer does not replace a joint. If a cabinet needs to carry weight, it needs joinery: a dado, a pocket screw, a dowel or a mortise and tenon. Nails hold parts while glue cures and hold trim that carries no load, and a carcase assembled with brads and no glue will rack itself apart.
For load-bearing assembly our pocket hole jig roundup covers the fastest strong option, wood joint types explained covers what each joint is actually for, and how long to clamp wood glue covers the timings that decide whether you need the nail as a clamp at all.
Where these numbers come from
Nail ranges, magazine angles, weights, operating pressures and air consumption above are the manufacturers' published specifications, taken from the maker's own product page where it publishes one — dewalt.com for the DCN660B, Metabo HPT's published figures for the NT65MA4 — and from the live retail listing otherwise, cited per product in Sources. Where a maker publishes nothing, we say so: DEWALT lists no weight, magazine capacity or collation angle for the DCN660B, NuMax lists no weight or minimum pressure for the SFN64, and Metabo HPT publishes no air consumption for the NT65M2S. Holding power is a mechanical consequence of nail diameter, not a figure we have measured — we do not run a lab, and our methodology page says so plainly.
