Double hole safety wire bolt

Cold heading process is one of the new processes for pressure machining of less or no cutting
metal. It is a processing method that utilizes the plastic deformation of metal under the action of
external forces, and with the aid of molds, redistributes and transfers the volume of metal to form
the required parts or blanks. The cold heading process is most suitable for producing standard
fasteners such as bolts, screws, nuts, rivets, and pins.etc

Double Hole Safety Wire Bolt – Comprehensive Overview

A Double Hole Safety Wire Bolt is a specialized fastener designed to remain securely locked in place even under extreme vibration, rotation, or dynamic loads. Unlike standard bolts, it incorporates two precisely drilled holes—typically in the head or along the shank—to accommodate a safety wire (lock wire) that physically prevents loosening.

Design & Construction

1. Hole Configuration:

   • Radial Holes (Most Common): Two small holes drilled perpendicular to the bolt’s axis, allowing the wire to pass through the sides of the head.

   • Axial Holes (Less Common): Holes drilled along the bolt’s length, used in specific applications where radial wiring isn’t feasible.

How It Works

• If the bolt tries to rotate, the wire resists movement.

• Proper wire tension ensures no slack, maintaining constant resistance.

Wiring Methods:

• Multi-Bolt Group Locking: A continuous wire threads through multiple bolts in series, securing an entire assembly.

• Double hole safety wire bolt

Key Applications

1. Aerospace: Jet engines, landing gear, and flight control systems (FAA/SAE standards).

2. Military/Defense: Firearms, armored vehicles, and aircraft (MIL-SPEC compliance).

3. Marine & Industrial: Pumps, turbines, and machinery exposed to constant motion.

Installation Best Practices

1. Wire Selection: Use stainless steel or Monel wire (0.020″–0.041″ thickness).

2. Tension: Maintain 6–8 twists per inch; too loose = ineffective, too tight = may break.

3. Inspection: Regular checks for wire integrity (no fraying or corrosion).

Conclusion

Double hole safety wire bolts provide the most reliable mechanical locking in extreme conditions where failure is not an option. Their design ensures longevity, reusability, and fail-safe operation, making them indispensable in aerospace, motorsports, and heavy industry.