Pick the nailer by the job
“Air nail gun” covers several quite different tools, and choosing the wrong one is the usual source of frustration. A nailer that is too small will not drive fasteners fully; one that is too big will split delicate trim or leave oversized holes. Start by deciding what you will fasten, then pick the category.
A pneumatic nailer runs on compressed air from a compressor, so it also needs an air supply that suits it. Nailers fire in short bursts and use relatively little air, which is why a small compressor often works for them. If you are still deciding on the supply side, read our guide to choosing an air compressor.
The main kinds of air nailers
Pin nailers
Pin nailers shoot very thin, headless pins, commonly 23 gauge. The holes are tiny and often barely visible. They hold little on their own, so they are used for delicate molding and for holding pieces while glue sets. They are not a structural fastener.
Brad nailers
Brad nailers typically fire 18-gauge brads. They are a common first nailer for hobbyists because they suit small trim, thin moldings, craft projects and light cabinet work. The holes are small and easy to fill. They are not meant for heavy trim or anything that carries load.
Finish nailers
Finish nailers use thicker nails, often 15 or 16 gauge, with more holding power. They are used for baseboards, door and window casings, crown molding and similar trim. The holes are larger than brad holes but still easy to fill. For an overview of the work they support, see trim carpentry.
Framing nailers
Framing nailers drive large nails for building walls, decks, fences and other structural work. They are heavy, powerful and made for speed. They typically use much larger nails than finish guns and often have a bigger magazine. If you are studying how a wall is built, our article on wall framing gives context. Check local building codes and fastener requirements for structural work, since the right nail type and spacing matter and codes vary.
Staplers and others
Staplers and roofing nailers also run on air, but they serve narrower jobs: upholstery, sheathing, subfloor and roofing. They have their own fasteners and are worth considering only if your project calls for them.
Fastener sizes
Nail dimensions are described by gauge (thickness) and length. A smaller gauge number means a thicker fastener, which surprises many beginners. So 15 gauge is thicker than 18 gauge, and 23 gauge is thinner still.
When choosing length, a common guideline is that a nail should be long enough to pass through the top piece and go well into the piece beneath it. Many woodworkers aim for the nail to reach around twice the thickness of the piece being fastened, though the right choice depends on the material and the load. If you are unsure about traditional nail size terms, our guide to nail sizes explains the penny system used for larger nails.
Always use the fastener type and size listed in the nailer’s manual. Nails are collated in strips or coils at specific angles, and a strip that does not match the magazine can jam or misfire.
Depth adjustment
Most good nailers have a depth adjustment, either a tool-free dial or a movable nose piece. It controls how deeply the nail is driven.
- Too shallow, and the head sticks up and needs a second hit.
- Too deep, and it can crush the surface or blow through thin material.
- For finish work, you generally want the head just below the surface so it can be filled.
Test on scrap that matches your real material. Hardwood and softwood behave differently, and adjusting the compressor’s regulated pressure also changes the result. Raise the pressure in small steps and stay within the tool’s rated range.
Trigger modes and safety
Trigger type affects both speed and safety.
- Sequential trigger: the safety tip must be pressed to the work first, then the trigger pulled for each nail. It is slower and gives more control, and it is generally the safer choice for beginners.
- Contact (bump) trigger: you can hold the trigger and bump the nose against the work to fire repeatedly. It is faster for repetitive work like sheathing, but it increases the chance of an unintended nail.
- Selectable triggers: some tools let you switch modes. If you have one, keep it on sequential unless you have a reason to change.
Basic safety habits apply to every nailer:
- Wear safety glasses or goggles every time. Nails can ricochet and compressed air can launch debris.
- Wear hearing protection for repeated firing.
- Keep your free hand clear of the nose and the line of fire.
- Disconnect the air supply before clearing jams, loading, or adjusting the tool.
- Never point the nailer at anyone, and never disable the safety tip.
- Do not nail near the edge of a board where the nail could exit, and be careful of knots and metal that can deflect a nail.
Other features worth considering
- Weight and balance: an overhead or long day of nailing is tiring. Lighter tools help, but very light ones may feel less stable.
- Magazine style and capacity: straight and angled magazines suit different tight spots.
- Jam clearing: a tool-free nose latch makes clearing a jam faster and safer.
- Adjustable exhaust: directs the burst of air away from your face.
- No-mar tip: a rubber tip protects finished surfaces.
- Air fitting compatibility: the nailer’s fitting should match your hose couplers.
A small amount of oil is usually needed in many air tools, though some are oil-free, and your manual will say which. Following that guidance prevents premature wear.
Matching nailers to a starter kit
Many people buy one nailer first. A brad nailer is a flexible first choice for light trim and projects. A finish nailer suits someone who will install trim regularly. A framing nailer makes sense mainly if you build decks, sheds or walls. Our article on the pneumatic tool kit discusses how air tools fit together in a shop, and the trade-offs of air versus other power are explored in pneumatic tool trade-offs.
This is general information, not professional trade advice. Follow the manufacturer’s manual for pressure, fasteners and maintenance.