What is the difference between a brad nailer and a finish nailer?

The key difference is nail size and holding power. A finish nailer drives 15-gauge or 16-gauge nails (thicker wire, 1 to 2.5 inches long). A brad nailer drives 18-gauge nails (thinner wire, 5/8 to 2 inches long). Finish nails are stronger and have more holding power, making them suitable for heavy trim like crown molding, baseboard, and door casing. Brads are thinner and leave smaller holes, making them ideal for thin trim, small moldings, picture frames, and delicate work where splitting is a concern. If you can only own one, a 15-gauge or 16-gauge finish nailer is more versatile. Add a brad nailer for thin trim and detailed work where a smaller hole matters. Do I need an air compressor for a nail gun?

Do I need an air compressor for a nail gun?

Not necessarily. Cordless (battery-powered) nail guns have become excellent alternatives to pneumatic (air-powered) nailers. Modern cordless finish nailers (Milwaukee M18 FUEL, DeWalt 20V MAX, Makita 18V) are powerful enough for all trim work and eliminate the need for a compressor, hose, and the associated noise and setup time. Cordless brad nailers are also widely available and work well. Cordless framing nailers are improving but are still slightly less powerful than pneumatic for all-day heavy framing. If you're a homeowner or DIYer doing occasional trim work, a cordless finish nailer is the most convenient option. If you're a professional trim carpenter doing high-volume work, a pneumatic setup is still faster, lighter (no battery weight), and more economical. What gauge nail gun do I need for trim?

What gauge nail gun do I need for trim?

For most interior trim work (baseboard, door casing, window casing, chair rail, crown molding), a 15-gauge or 16-gauge finish nailer is the right tool. The 15-gauge is preferred for heavier trim (thick crown molding, 5.25-inch baseboard, stair parts) because it has more holding power. The 16-gauge works well for lighter trim and produces a slightly smaller hole. For thin moldings (shoe molding, screen mold, small quarter round), an 18-gauge brad nailer is better because the thin nails won't split narrow stock. For the finest trim and detail work (applied moldings, veneer, tiny trim), a 23-gauge pin nailer is ideal. A good starter combination for a homeowner: a 15-gauge finish nailer and an 18-gauge brad nailer cover 95% of trim applications.

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Siding & Exterior

Nail Gun Types Guide: Framing, Finish, Brad, Pin & Roofing Nailers Explained

Lumberama Editorial Team, Construction Tools & Fastener Specialists Jan 17, 2025 12 min read

Framing Nailers

Framing nailers drive the largest nails and are built for structural construction work: wall framing, roof framing, floor framing, deck building, sheathing, and any application that requires structural fastening.

Nail sizes: 2-inch to 3.5-inch nails. Common sizes: 2-3/8 inch (8d), 3 inch (10d), 3-1/4 inch (12d), and 3-1/2 inch (16d). Framing nails are either round-head (full head) or clipped-head (D-head). Round-head nails provide maximum holding power and are required by some building codes. Clipped-head nails allow more nails per magazine strip.

Nail gauge: Most framing nails are 10-gauge or 11-gauge (thick, strong wire).

Power sources: Pneumatic (air compressor powered, the standard), cordless battery-powered (gas cartridge or battery-only), and powder-actuated (for driving nails into concrete and steel). Pneumatic framing nailers are the most common on job sites because they're powerful, reliable, and have the highest firing rate.

Applications: Wall framing (top plates, bottom plates, studs, headers), floor framing (rim joists, blocking), roof framing (rafters, ridge boards), deck framing (joists, ledger boards), sheathing attachment (OSB, plywood to framing).

Finish Nailers (15-Gauge and 16-Gauge)

Finish nailers drive medium-sized nails for trim work, cabinetry, and furniture assembly. They're the workhorse of trim carpentry.

15-gauge finish nailer: Drives 15-gauge nails (slightly thicker wire) in 1-inch to 2.5-inch lengths. The 15-gauge nail has more holding power than a 16-gauge nail and is preferred for heavy trim: crown molding, baseboard, door casing, chair rail, stair parts, and cabinet installation. 15-gauge nails are angled (the magazine is at an angle to the nailer body), which allows better access in tight corners.

16-gauge finish nailer: Drives 16-gauge nails in 3/4-inch to 2.5-inch lengths. Slightly thinner than 15-gauge, so the nail hole is smaller and less visible. 16-gauge nailers are straight-magazine (the magazine is parallel to the nailer body). Good for: lighter trim, shelf installation, furniture assembly, and applications where a smaller nail hole is preferred.

Which to choose: If you can only own one finish nailer, choose a 15-gauge. The 15-gauge nail has enough holding power for all trim work, including heavy crown molding and thick baseboard. The 16-gauge is a good second nailer for lighter work and thinner materials.

Brad Nailers (18-Gauge)

Brad nailers drive thin 18-gauge nails (brads) in 5/8-inch to 2-inch lengths. Brads are thin enough that they leave a tiny hole that's nearly invisible, especially in softwood and painted trim.

Applications: Thin trim and small moldings (shoe molding, screen mold, lattice), picture frame assembly, cabinet backs and panel attachment (1/4-inch plywood backs), light furniture assembly, and any application where you need a fastener that doesn't split thin material and leaves a nearly invisible hole.

Limitations: Brads don't have enough holding power for heavy trim (crown molding, baseboard) or structural applications. They're a holding fastener, not a structural fastener.

Pin Nailers (23-Gauge)

Pin nailers drive headless 23-gauge pins in 1/2-inch to 2-inch lengths. Pins are so thin that they leave virtually no visible hole — no filling or putty required. The 23-gauge pin is essentially a piece of wire with no head.

Applications: Holding delicate moldings and trim in place while glue dries (the pin acts as a clamp, the glue provides the strength), assembling mitered picture frames, attaching thin veneers and edge banding, and any application where even an 18-gauge brad would leave too large a hole or split the material.

Roofing Nailers

Roofing nailers (coil nailers) drive short, large-head nails designed specifically for attaching asphalt shingles, roofing felt, and cap nails for house wrap. Roofing nails have a large, flat head (3/8 to 7/16 inch diameter) that holds the shingle material without tearing through. Nail lengths: 3/4 inch to 1-3/4 inches.

Pneumatic vs Cordless

Pneumatic (air-powered): Requires an air compressor and a hose. Pneumatic nailers are lighter (no battery), more powerful, and have a higher firing rate. The compressor and hose are the downside: setup time, hose management, and compressor noise. Pneumatic is the standard for professional contractors and high-volume work.

Cordless (battery-powered): No compressor or hose needed. Cordless nailers are more portable and faster to set up. Modern cordless finish nailers (Milwaukee, DeWalt, Makita) are powerful enough for all trim work. Cordless framing nailers are improving but are still slightly less powerful than pneumatic for all-day, heavy-duty framing. Cordless nailers are heavier (battery weight) and more expensive than pneumatic equivalents.