Pentagonal barrel nut

冷镦加工是一种少切削或无切削的压力加工新工艺
金屬。它是一種利用金屬在下列因素作用下產生塑性變形的加工方法
外力作用下，在模具的幫助下，重新分配和轉移金屬的體積，以形成
所需的零件或坯料。冷镦工艺最适合生产标准的
螺栓、螺絲、螺帽、鉚釘和銷等緊固件

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

主要功能：

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. 材料:

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

4. 線路類型:

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

5. 應用:

   • 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).

優勢：

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

• 耐用性: Resists wear and corrosion.

• Aesthetics: Smooth barrel shape provides a clean look.

• Pentagonal barrel nut

缺點：

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

• Limited availability compared to standard nuts.