Flat head Chicago screw

冷間圧造加工は、切削の少ない、あるいは切削を必要としない新しい圧造加工のひとつである。
金属。の作用による金属の塑性変形を利用した加工法である。
外力を受け、金型の助けを借りて、金属の体積を再分配し、移動させる。
必要な部品やブランクを製造します。冷間圧造工程は、標準的な
ボルト、ネジ、ナット、リベット、ピンなどの留め具。

Flat Head シカゴ・スクリュー, also known as sex bolts, binding posts, or barrel nuts, are two-part fasteners consisting of a male screw そして 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 stainless steel, 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)

利点がある：

• Reusable – Can be unscrewed and reassembled.

• Flush Finish – No protruding parts.

• Stronger than rivets – Allows for disassembly without damage.