Flat head plum blossom with column

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

The flat-head plum blossom with column refers to a type of screw or bolt head that features a plum blossom (hexalobular) drive design with a central column. This design is commonly used in tamper-resistant fasteners, requiring a specialized driver bit for installation and removal.

Key Features:

1. Flat Head – The top surface is flat, allowing it to sit flush with or below the material surface when installed.

2. Plum Blossom (Hexalobular) Drive – A star-shaped recess with six rounded lobes, providing better torque transmission and reduced cam-out compared to standard Phillips or slotted drives.

3. Central Column (Pin) – A small protrusion in the middle of the drive recess, acting as a security feature to prevent tampering with standard bits. Only a compatible pin-in-hex or security Torx bit can engage with it.

4. Tamper-Resistant – The central column makes it difficult to remove with ordinary tools, enhancing security in public or high-risk installations.

Common Applications:

• Electronics (e.g., gaming consoles, hard drives)

• Automotive components

• Public fixtures (e.g., restroom hardware, street furniture)

• Aerospace and machinery requiring secure fastening

• Flat head plum blossom with column

Standards & Sizes:

• Often follows Torx TR (Tamper-Resistant) standards (e.g., Torx TR8, TR10, etc.).

• Available in various screw sizes (diameter and length) depending on application needs.

This design balances security, torque efficiency, and a low-profile finish, making it ideal for applications where both tamper resistance and a smooth surface are required.