6.1 Forcible Entry Tools & Techniques

Section 6.1: Forcible Entry Tools & Techniques

Forcible entry is the technique used by firefighters to gain access to a structure or area where entry is locked, blocked, or otherwise obstructed. NFPA 1001, Standard for Fire Fighter Professional Qualifications, mandates that a Firefighter I must be able to identify, select, carry, and safely operate forcible entry tools under emergency conditions. Success in these operations requires a deep understanding of tool mechanics, materials, and safe operational protocols.

The Irons: Flat-Head Axe & Halligan Bar

The combination of a flat-head axe and a Halligan bar is known in the fire service as "the irons." This pairing represents the most versatile and frequently utilized forcible entry toolset in structural firefighting.

The Flat-Head Axe

The flat-head axe is primarily a striking tool but serves double duty as a wedge. It typically features a 6-pound or 8-pound drop-forged steel head mounted on a fiberglass or wooden handle. In forcible entry, the flat-head of the axe is used to strike the Halligan bar, driving it into tight gaps between doors and frames. Firefighters must never use a pick-head axe as a striking tool, as the pick end poses a severe impalement hazard to the firefighter holding the prying tool.

The Halligan Bar

Invented by FDNY Deputy Chief Hugh Halligan, this tool is a single-piece, drop-forged alloy steel prying tool. A standard Halligan is 30 inches long and features three distinct working ends that provide exceptional mechanical advantage:

1. The Fork (or Claw): A split claw used for prying open doors, pulling lock cylinders, or lifting floorboards. It has a slight curvature (approximately 15 degrees) that acts as a built-in fulcrum.
2. The Adze: A wide, flat wedge set at a 90-degree angle to the shaft. It is used to gap doors, pry latches, or create space for the fork.
3. The Pick: A tapered, triangular spike extending opposite the adze. It is used for puncturing locks, prying open heavy padlocks, or creating purchase points in sheet metal.

       ADZE ────────┐  ┌─────── PICK
                    └──┴──┐
                          │
                          │ SHAFT (30 inches)
                          │
                    ┌──┬──┘
       FORK ────────┘  └───

Team Operations and Commands

Breaching a door with the irons is a coordinated two-firefighter operation. One firefighter (the tool operator) positions and guides the Halligan, while the second firefighter (the striker) delivers strikes with the flat-head axe. Safety and efficiency rely on clear, standardized vocal commands:

• "HIT!": A command from the tool operator directing the striker to deliver a single, controlled blow to the striking face of the Halligan. The striker must wait for each command before hitting again.
• "STOP!": Instantly halts all striking. The tool operator uses this command to assess progress, adjust tool placement, or address safety concerns.
• "DRIVE!": Instructs the striker to deliver multiple, rapid, consecutive blows to drive the tool deep into the jamb until the operator commands "STOP."

---

Tool Categories and Technical Applications

To ensure proper tool selection and safety on the fireground, firefighters must be familiar with the specifications and hazards of each tool category:

---

Lock Pulling Tools: The K-Tool

When firefighters must gain entry with minimal damage (often referred to as "through-the-lock" entry), pulling the lock cylinder is the preferred method. The K-tool is a specialized device designed specifically for this purpose.

The K-tool features a heavy steel block with a V-shaped notch cut into its face and a metal loop welded to its back. The V-notch is placed over the exposed collar of a rim or mortise lock cylinder. The firefighter uses the flat-head axe to drive the K-tool downward onto the cylinder until the V-blade bites securely into the metal. The fork or adze of the Halligan is then slipped through the K-tool’s loop. Prying downward on the Halligan pulls the cylinder out of the door, exposing the lock mechanism.

Once the cylinder is removed, a key tool (a double-ended flat steel rod with a flat screwdriver-like tip on one end and an angled cam operator on the other) is inserted into the cylinder hole. The firefighter manipulates the internal lock cam to release the latch and open the door.

---

Power Cutting Tools: Rotary Saws

Rotary saws provide rapid cutting capabilities through heavy wood, metal, and concrete. However, they are among the most dangerous tools on the fireground.

Blades and Applications

Using the correct blade is critical for safety and tool efficiency:

• Carbide-Tipped Blades: Designed for cutting wood, plaster, and light plastics. They cut quickly but must never be used on metal, as the carbide teeth can violently shear off and strike the operator.
• Abrasive Discs: Made of composite materials like aluminum oxide or silicon carbide. They are used for cutting steel, iron, masonry, and concrete. These blades wear down as they cut and are prone to shattering if bound or pinched.
• Diamond-Grit Blades: Steel discs with industrial diamond particles bonded to the edge. They are highly durable, do not shrink in size during use, and can cut wood, metal, concrete, and composite materials.

Operational Safety

When operating a rotary saw, firefighters must maintain a firm, two-handed grip and a wide, stable stance. The engine should be started on the ground and allowed to warm up. Before making a cut, the operator must bring the saw to full throttle. The cut must be straight; twisting or angling the saw mid-cut will bind the blade, causing kickback or blade failure. Operators must also watch for the gyroscopic effect, where the spinning blade resists changes in direction, potentially causing the saw to pull unexpectedly.

---

Hydraulic Forcible Entry Tools

Hydraulic tools use pressurized fluid to exert immense force, allowing a single firefighter to breach heavy doors or cut security bars.

Hydraulic Door Openers

Commonly known as "rabbit tools" or the "Hydra-Ram," these devices consist of a hand pump connected by a hose to a set of jaws, or a self-contained unit. The jaws are slipped into a gap between the door and the frame (often created using the Halligan adze). Operating the pump expands the jaws, exerting up to 10,000 pounds of force to pop the latch or tear the hinges from the frame.

Safety and Maintenance

Most rescue-grade hydraulic tools operate at pressures up to 10,000 psi. Firefighters must inspect hoses for kinks, cuts, or leaks before use. A pinhole leak in a pressurized hydraulic hose can cause a fluid injection injury, where fluid is forced beneath the skin, causing severe tissue damage. Never search for leaks with bare hands.