Cup Head Step Shear Bolt

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 Cup Head Stepped Shear Bolt is a specialized fastener designed for applications where controlled shearing and secure fastening are required. Here’s an overall description of its key features:

1. Design & Structure:

• Cup Head: Features a rounded, dome-shaped head that provides a smooth finish and aesthetic appeal while allowing for tool engagement (typically a wrench or socket).

• Stepped Shank: The bolt has a reduced-diameter section (step) near the head or along the shank, which acts as a predetermined shear point. This ensures the bolt breaks at a specific load, preventing damage to other components.

• Cup Head Step Shear Bolt

• Threaded Portion: The lower part of the shank is threaded to engage with a nut or tapped hole, ensuring a secure hold.

2. Material:

• Typically made from high-strength steel (grade 5 or 8) or stainless steel for corrosion resistance.

• May feature coatings like zinc plating or hot-dip galvanizing for enhanced durability.

3. Function & Applications:

• Shear Function: The stepped section is designed to shear off under a specific torque or load, acting as a mechanical fuse to protect machinery from overload.

• Common Uses:

  • Automotive (suspension systems, drivetrain components)

  • Cup Head Step Shear Bolt

  • Aerospace (engine mounts, structural assemblies)

  • Industrial Machinery (safety-critical bolted joints)

  • Railway & Construction (where controlled failure is necessary)

4. Advantages:

• Controlled Failure: Prevents damage to expensive components by shearing at a set load.

• Secure Fastening: The cup head provides a strong clamping force before shearing.

5. Standards & Specifications:

• May conform to ISO, DIN, SAE, or ASTM standards depending on application.

• Available in various diameters (e.g., M6, M10, ½”) and lengths.

• Cup Head Step Shear Bolt

6. Installation & Removal:

• Installed using standard tools (wrench/socket).