What is the safest nail gun trigger setting?

A sequential (single-shot) trigger is the safest, because it forces you to press the nose against the work first and then pull the trigger for each nail — one deliberate action per fastener. A contact (bump) trigger fires whenever the nose is depressed while the trigger is held, which is faster for production work but is linked to far more unintended-discharge injuries, including double-fires and nails driven when the tool bumps something. For DIY and general use, keep the tool in sequential mode; the small speed loss is worth the large safety gain.

Where do most nail gun injuries happen?

According to the CPSC and safety research, the hand and fingers are by far the most commonly injured, usually when the free hand holding the workpiece is too close to the firing line and a nail goes through the wood into it, or when a nail deflects off a knot or an existing nail and exits the side of the board. Keeping your non-tool hand well clear of the nail path — never directly behind or beside where the nail exits — prevents the majority of these injuries.

Can a nail gun fire two nails at once?

Yes — it's called a double-fire, and it's most common with contact (bump) triggers. When the tool recoils on firing, if the trigger is still held and the nose bounces back onto the work, it fires again involuntarily, sometimes in an unexpected direction. This is a leading cause of nail gun injuries. Sequential triggers eliminate it because each shot requires a fresh trigger pull. If you use a contact trigger, keep firm control against recoil and release the trigger between placements.

What causes a nail to blow out the side of the board?

Nails deflect and blow out when they hit a knot, a hidden existing nail or screw, or the grain steers them, and when you nail too close to an edge or drive at a steep angle. The nail follows the path of least resistance and can exit the side of the board — sometimes toward your hand. Prevent it by nailing at least a little in from edges, driving perpendicular to the surface, watching for knots, and never placing your free hand where a deflected nail could reach it.

Do you need eye protection to use a nail gun?

Yes, always — ANSI-rated safety glasses at minimum. Nail guns can send fragments, deflected nails, or debris toward your face, and eye injuries are a documented risk. Hearing protection is wise with pneumatic guns and compressors too. Also never disable or wedge the tool's nose safety contact, never carry the tool with a finger on the trigger, disconnect the air or battery before clearing a jam, and keep bystanders out of the firing area. These basics prevent the great majority of serious incidents.

How to Use a Nail Gun Safely (Brad and Finish Nailers)

Written & researched by Priya Anand DIY & Tools Editor

Updated August 2026

Low-angle view of a person drilling into a timber board on a workbench, sawdust in the air, in soft early-morning light

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A nail gun makes fast, professional-looking work of trim and framing, but it deserves respect — nail gun injuries send tens of thousands of people to US emergency rooms each year, and OSHA puts the figure at tens of thousands of serious injuries annually. The good news: nearly all are preventable with a few habits. There’s no cost or permit to using one safely; it’s about technique. The big ones are running a sequential (single-shot) trigger instead of a bump trigger — OSHA cites research finding the risk of injury twice as high with a multi-shot contact trigger as with a single-shot sequential one, keeping your free hand out of the nail path, wearing eye protection, and disconnecting power before clearing a jam. Learn those and a nailer is a safe, transformative tool.

Beginner’s Guide To Using A Brad Nailer (Ace Hardware)

Tools and materials

The right nailer for the job — a brad nailer (18-gauge) for trim and light work, a finish nailer (15/16-gauge) for heavier trim, a framing nailer for structure.
ANSI-rated safety glasses (mandatory) and hearing protection for pneumatic setups — a compressor and nailer together clear the 85 dBA NIOSH treats as hazardous.
The correct nails for your tool and material, and a firm clamp or a helper so your free hand doesn’t have to hold work near the firing line.
A nailer speeds builds like a picture frame or crown molding; a cordless drill still handles structural fastening.

Overhead view of a person drilling into a timber board on a workbench, sawdust in the air, in warm late-afternoon light

Step 1: Set a sequential trigger

If your gun has a switchable trigger, set it to sequential (single-shot) mode: nose down first, then pull the trigger, one nail per pull. This one setting eliminates double-fires and most unintended discharges — the injuries a contact/bump trigger is repeatedly linked to. Reserve bump-firing for experienced production work; for DIY, sequential is the safe default.

Step 2: Keep your free hand clear

The hand and fingers are the most-injured body part, usually the free hand steadying the work. Never place it behind, beside, or in line with where the nail exits. Clamp the workpiece instead, or hold it a hand-span away from the nail path. Assume a nail could deflect and exit the side of the board, and keep flesh out of that arc.

Three-quarter view of a person drilling into a timber board on a workbench, sawdust in the air, in soft overcast light

Step 3: Avoid blowouts and deflections

Nails deflect off knots, hidden nails, and steep angles, and blow out near edges. Drive perpendicular to the surface, stay in from edges, and watch the grain and for existing fasteners. When you must nail near an edge or into questionable material, position your body and hands so a stray nail can’t reach them.

Step 4: Wear eye protection and control recoil

Put on ANSI-rated safety glasses every time — deflected nails and fragments are a real eye-injury risk. Hold the tool firmly so it doesn’t bounce off the work after firing, and release the trigger between placements. Never carry a nailer with your finger on the trigger, and never defeat the nose safety contact.

Overhead view of a person drilling into a timber board on a workbench, sawdust in the air, in soft early-morning light

Step 5: Clear jams safely

When the gun jams, disconnect it first — unplug the air hose or remove the battery before you open the nose or poke at the magazine. A tool that fires while your fingers are in the mechanism causes serious injury. Clear the jam with the tool dead, reconnect, and test-fire into scrap before resuming.

Where to go next

A safe nailer makes finish work like crown molding and picture frames quick and clean. Pair it with accurate cuts from our speed square guide. It all lives under the power tools and workshop hub.

We never buy or physically test the tools we rank — our picks come from aggregated owner reviews and expert consensus, explained on how we rank. Always follow the tool manufacturer’s safety manual.

How to Use a Nail Gun Safely