Why Are Cold-Pressed Contacts Crimped into a Hexagonal Shape?

When it comes to high-reliability electrical connections, the shape of the terminal after compression is not just a matter of aesthetics—it is a matter of physics. The hexagonal crimp is the industry standard for most circular terminals because it provides the most uniform distribution of pressure across the wire strands.

The Engineering Behind Hexagonal Crimping

A hexagonal shape is preferred because it applies force from six different directions simultaneously. This symmetrical pressure ensures that the individual copper strands within the wire are compressed into a solid mass with minimal voids. By reducing the gaps between strands, the contact crimping process achieves maximum electrical conductivity and high tensile strength.

Key Benefits of the Hexagonal Profile

• Uniform Compression: Prevents uneven stress that could lead to wire breakage.

• Reduced Resistance: High-density compression minimizes the voltage drop across the joint.

• Mechanical Integrity: The geometry creates a "cold weld" effect, making the wire nearly impossible to pull out.

Selecting the Right Contact Crimper

Achieving a perfect hexagonal finish requires the correct tool. For standard industrial applications, a heavy-duty contact crimper is used to handle thicker gauges. However, for precision electronics, such as those used in communication ports, a specialized d sub contact crimper is necessary. These tools are calibrated to handle the delicate dimensions of D-Subminiature pins while still maintaining the structural integrity of the crimp.

Ensuring Quality in Your Connections

To maintain professional standards, always inspect the crimp for symmetry. A "flash" or "wing"—where metal escapes between the die faces—indicates that the tool is worn or the terminal size is incorrect. Using a high-quality d sub contact crimper ensures that even the smallest pins meet rigorous aerospace and industrial certifications, providing a long-lasting, gas-tight seal.