The Main Body Of The Cold-pressed Pin Is Typically Made Of Copper Alloy: H62 Brass
H62 brass alloy serves as the industry standard for cold pressing needle fabrication because its 62% copper content delivers electrical conductivity above 20% IACS while providing optimal ductility for mechanical deformation without micro-fracturing during wire termination processes.
Material Mechanics in Electrical Crimping Terminals
Electrical connectors require materials capable of balancing electron flow with physical strain. Selecting the wrong alloy causes terminal relaxation, localized heating, or mechanical fatigue under continuous thermal cycling.
-
Electrical Conductance: Retains signal integrity while minimizing resistive voltage drops across connections.
-
Yield Strength: Prevents permanent pin deformation during insertion cycles into a female crimp contact assembly.
-
Plasticity: Allows cold swaging without creating microscopic cracks along stress boundaries.
Evaluating H62 Brass Physical Properties
Standardized brass compositions define precise mechanical boundaries. H62 brass contains roughly 62% copper and 38% zinc, forming a balanced alpha-beta phase microstructure engineered for high-volume cold heading operations.
| Property Parameter | H62 Brass Value | Engineering Benefit |
|---|---|---|
| Electrical Conductivity | 25 - 28% IACS | Ensures low-resistance signal transmission |
| Tensile Strength (Rm) | 370 - 440 MPa | Resists axial compression during mating |
| Elongation at Break | > 30% | Supports secure crimp barrel deformation |
| Vickers Hardness | 85 - 120 HV | Protects pin geometries against surface wear |
Performance Balance in Pin Fabrication
Precision manufacturing demands tight dimensional tolerances. A cold pressing needle produced from H62 brass exhibits uniform grain structure, enabling smooth automated feeding, consistent cut-off, and clean tip forming.
Crimp Barrel Plasticity
During wire attachment, the sleeve undergoes cold work hardening. H62 brass allows high displacement without fracturing, creating gas-tight joints around stranded copper conductors.
Contact Engagement Durability
Mating a male crimp contact requires consistent normal force. H62 offers spring retention characteristics that prevent permanent set, maintaining low contact resistance across repeated insertion cycles.
