The Definition of Nail Gun Safety

Definition of Nail Gun Safety

Nail gun safety is the set of tool choices, training and work practices used to prevent injuries from pneumatic, cordless and powder-actuated nailers. Nail guns drive fasteners with great force and speed, and a nail that fires unexpectedly, passes through the work or ricochets can cause serious puncture wounds to hands, legs, eyes and other parts of the body.

Nail guns are used every day in residential construction, framing, roofing, pallet making and furniture manufacturing. They make work faster, but they are also a leading cause of tool-related injuries in construction. OSHA and NIOSH estimate that nail guns are responsible for tens of thousands of emergency room visits in the United States each year, most of them puncture wounds to the hands and fingers.

OSHA does not have a single standard for nail guns, but employers must protect workers under the general tool requirements in 29 CFR 1926.300 and 1926.302, the PPE rules and the General Duty Clause. The joint OSHA and NIOSH guide on nail gun safety for construction contractors is the most widely used guidance.

Trigger Types and Why They Matter

The trigger mechanism is the most important factor in nail gun injury risk. Nail guns work with two controls: the finger trigger and the contact safety tip at the nose of the tool.

• Full sequential trigger: the contact tip must be pressed against the work before the trigger is pulled, and each nail needs a fresh sequence. This is the safest type.
• Single sequential trigger: similar to full sequential, but the tool can fire a second nail if the contact tip is released and pressed again while the trigger is held.
• Contact or bump trigger: the tool fires whenever the contact tip and trigger are both activated, in any order. Holding the trigger down and bumping the nose fires nails rapidly.
• Single actuation trigger: fires once when the contact tip is pressed and the trigger is pulled, then needs the trigger released before firing again.

Research cited by OSHA and NIOSH found that the risk of injury with a contact trigger is about twice that of a full sequential trigger. Using full sequential triggers is the single most effective control.

Common Causes of Nail Gun Injuries

• Unintended double fire: the recoil causes the contact tip to bounce and fire a second nail, especially with contact triggers.
• Firing while moving: a worker carrying the tool with a finger on the trigger bumps a leg or a coworker.
• Nail penetration: a nail passes through thin material or misses the framing and exits the other side.
• Ricochet: a nail hits a knot, metal connector or another nail and deflects.
• Awkward positions: nailing overhead, toenailing or working off ladders makes it hard to control the tool.
• Bypassing safety features: removing or taping down the contact tip. See bypassing safety devices.

Preventing Nail Gun Injuries

• Buy or switch to tools with full sequential triggers, and provide them to new or less experienced workers.
• Train workers on how each trigger type works, safe handling, and how to clear jams.
• Keep hands at least 12 inches from the nailing point and use clamps to hold small pieces.
• Keep fingers off the trigger when carrying the tool or moving between positions.
• Never point a nail gun at anyone, and stay out of the line of fire of other nailers.
• Disconnect the air supply or remove the battery before clearing jams, adjusting or handing the tool to someone else.
• Provide PPE including safety glasses or goggles marked Z87, hard hats and hearing protection. See eye protection and noise reduction rating.
• Encourage reporting of injuries and near misses, since nail gun injuries are often underreported.

Example of Nail Gun Safety

A residential framing contractor had three hand puncture injuries in one season, all from crews using contact-trigger framing nailers. One apprentice was hit in the thigh when he walked across a deck with his finger on the trigger and the tool bumped his leg.

The contractor replaced all contact-trigger nailers with full sequential models, ran a hands-on training session for every crew, and added nail gun handling to its new-hire orientation. Supervisors checked during site visits that no contact tips were disabled. The following year, the company recorded no nail gun injuries, and crews reported that the sequential triggers slowed them down less than expected.

Frequently Asked Questions: Nail Gun Safety

Which nail gun trigger is safest?

The full sequential trigger is the safest because it fires only when the contact tip is pressed first and the trigger is then pulled, with a new sequence for every nail.

What are the most common nail gun injuries?

Puncture wounds to the hands and fingers are the most common, followed by injuries to the legs, feet, eyes and head.

Should a nail gun puncture be treated as minor?

No. Nail wounds can damage tendons, nerves and joints and can become infected. The worker should get medical care, and the event should be reported and investigated.