Flat head Chicago screw

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

Flat Head 芝加哥螺絲, also known as sex bolts, binding posts, or barrel nuts, are two-part fasteners consisting of a male screw 和一個 female barrel. They are commonly used in leatherworking, bookbinding, and other applications where a flush, low-profile connection is needed.

Features of Flat Head Chicago Screw:

1. Flat Head Design – The screw has a countersunk flat head that sits flush with the surface when installed.

2. Threaded Barrel (Female Part) – The barrel nut has internal threads that accept the male screw.

3. No External Threads Visible – Once assembled, the screw threads are hidden inside the barrel, providing a clean finish.

4. Secure Fastening – They provide a strong, permanent or semi-permanent hold, often requiring a tool (like a screwdriver or spanner wrench) for disassembly.

5. Variety of Materials – Available in 不銹鋼, brass, aluminum, and steel, with options for plating (nickel, black oxide, etc.).

6. Multiple Sizes – Come in different lengths and diameters (e.g., #6-32, #8-32, #10-24, 1/4″-20, etc.).

Common Uses:

• Leathercraft (belts, holsters, straps)

• Bookbinding (removable covers, portfolios)

• Furniture assembly

• Signage & displays

• Military & tactical gear (where rivets aren’t suitable)

優勢：

• Reusable – Can be unscrewed and reassembled.

• Flush Finish – No protruding parts.

• Stronger than rivets – Allows for disassembly without damage.