M3-M8 Chicago Nuts & Binding Posts | Brass/Stainless Steel Sex Bolts

Premium M3-M8 Chicago Nuts (also known as Binding Posts or Screw Posts) designed for low-profile, secure fastening. These two-piece sex bolts consist of a female threaded barrel and a male screw, providing a clean look on both sides. Available in Solid Brass304 Stainless Steel, and Nickel-Plated Steel. Ideal for leather crafting, menus, photo albums, and industrial knife handles.
  • Sizes: Metric M3, M4, M5, M6, M8
  • Barrel Lengths: 5mm to 150mm (Customizable)
  • Material: Brass / Stainless Steel / Steel
  • Feature: Flush-fit decorative head with slotted or Phillips drive.
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Professional M3-M8 Chicago Nuts: The Elegant Binding Solution

Our M3-M8 Chicago Nuts, widely recognized as Binding Posts or Screw Posts, offer a unique two-piece fastening solution that provides a finished look on both sides of the application. Unlike standard nuts and bolts, these sex bolts consist of a smooth, internally threaded barrel (female) and a matching machine screw (male). This design makes them the preferred choice for applications where aesthetics and a low-profile finish are as important as structural integrity.

As a specialized Chicago nut manufacturer, we provide high-precision fasteners in various materials, from decorative Solid Brass for luxury leather goods to heavy-duty 304 Stainless Steel for industrial assemblies.

Key Advantages of Our Binding Post Series

  • Low-Profile Aesthetic: The flat, decorative heads sit flush against the material, preventing snagging and providing a professional, high-end appearance.
  • Easy Tool Assembly: Features standard Slotted or Phillips drives, allowing for quick assembly and disassembly with common screwdrivers.
  • Adjustable Grip: Available in a vast array of barrel lengths from 5mm to 150mm, ensuring a perfect fit for varying material thicknesses.
  • Corrosion Protection: Our Nickel-Plated Steel and Stainless Steel options are ideal for items exposed to moisture or frequent handling.

Technical Data: Chicago Nut DimensionsUse the chart below to select the correct metric Chicago screw for your binding or assembly project.

Thread SizeBarrel Dia (mm)Head Dia (mm)Standard Lengths
M45.0 mm9.0 mm5mm – 50mm
M55.0 mm10.0 mm6mm – 100mm
M68.0 mm12.0 mm10mm – 120mm
M810.0 mm16.0 mm15mm – 150mm

Applications Across Crafts and IndustryOur M3-M8 Sex Bolts are versatile fasteners used in many creative and industrial fields:

  • Leather Crafting: Securing belts, saddlery, holsters, and high-end bags.
  • Bookbinding & Menus: Perfect for holding together swatch books, restaurant menus, and architectural portfolios.
  • Knife Making: Used as Handle Bolts to secure scales to the tang of a knife.
  • Signage & Displays: Mounting acrylic panels and decorative signs to walls or stands.

Chicago Nut Frequently Asked QuestionsQ: What is the difference between a Chicago Nut and a Sex Bolt?
A: They are essentially the same. “Chicago Nut” is more common in crafting and binding, while “Sex Bolt” or “Barrel Nut” is often used in industrial and architectural contexts.

Q: Do you offer custom colors like Antique Brass or Matte Black?
A: Yes, we provide a wide range of decorative finishes including Antique Brass, Black Zinc, and PVD Gold to match your product design.

Source M3-M8 Chicago Nuts from a Trusted Manufacturer

Seeking bulk binding posts with custom lengths and premium finishes? We support OEM projects and global wholesale orders. Contact us today for a free quote and technical samples!

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Common Names

Chicago Screws, Binding Posts, Sex Bolts

Material

Brass, Stainless Steel 304, Carbon Steel

Surface Finish

Nickel, Antique Brass, Black Zinc, Polished

Thread Size

M3, M4, M5, M6, M8

Barrel Diameter

4mm, 5mm, 8mm, 10mm

Head Style

Flat Head, Truss Head, Oval Head