As precision components, connectors place extremely high demands on the dimensional accuracy of their molds. Based on their construction, connector molds fall into two main categories: Plastic molds for manufacturing plastic housings and stamping molds for processing metal parts. Due to their differing functions, the criteria for selecting mold steel vary between these two types.
Plastic molds are primarily used to produce the plastic housings of connectors; while there are no specific requirements for surface polishability, there is a strong emphasis on dimensional accuracy, wear resistance, and service life. Since the molds must withstand high-volume production, the mold surfaces must remain free from deformation (such as sinking), and dimensions must remain stable. Quenched SKD61 is commonly used for the mold body, while the mold core often utilizes pre-hardened materials known for excellent toughness or wear resistance-such as specific grades of pre-hardened steel.
Metal stamping molds are primarily used to stamp metal components, particularly copper parts. These molds also require strict dimensional accuracy. Given the high stamping speeds involved (often reaching 300 strokes per minute), the mold plates and punches must exhibit outstanding wear resistance. The requirements for punch materials are more complex: they must be wear-resistant enough to maintain sharp edges without collapsing, yet tough enough to prevent edge chipping.
For the plates of stamping molds, mold steels such as Cr12MoV, SKD11, D2, or DC53 are typically selected.
For the punches of stamping molds, preferred materials include pre-hardened SKD11, DC53, and high-speed steel SKH-9, as well as powder metallurgy high-speed steels like ASP23 and ASP60.