Pentagonal barrel nut

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

A pentagonal barrel nut is a specialized type of fastener designed for security and tamper resistance. Here’s a detailed description:

Key Features:

1. Shape:

   • Externally Pentagonal (5-sided): Unlike standard hexagonal nuts, it has five flat sides, requiring a matching pentagonal socket for installation/removal.

   • Barrel (Cylindrical) Design: The nut has a rounded, barrel-like body, making it harder to grip with conventional tools.

   • Pentagonal barrel nut

2. Tamper-Resistant Design:

   • The uncommon pentagonal shape prevents easy removal with standard hexagonal wrenches or pliers.

   • Often used in high-security or public installations where vandalism/theft is a concern.

3. Materials:

   • Typically made from hardened steel, stainless steel, or brass for durability and corrosion resistance.

4. Thread Type:

   • Available in various thread sizes (metric or imperial) to fit corresponding bolts.

5. Applications:

   • Used in public fixtures (e.g., benches, signage), electronics, automotive, and machinery where tamper-proofing is needed.

   • Common in industries requiring controlled access (e.g., transportation, utilities).

Advantages:

• Security: Deters casual tampering due to the lack of standard tools.

• Durability: Resists wear and corrosion.

• Aesthetics: Smooth barrel shape provides a clean look.

• Pentagonal barrel nut

Disadvantages:

• Requires a special pentagonal socket/key for installation/removal.

• Limited availability compared to standard nuts.