HW-Coated Ball Lock Ejector Punches - Heavy Load (SKH51 Steel)

These HW-coated ball lock ejector punches are used in injection mold tooling where stable ejection and sliding wear resistance are both critical. The ball-lock geometry provides positive retention in the ejector plate and helps maintain punch positioning across repeated shots, making it suitable for automotive connector and terminal molds that run high cycle counts and require consistent ejection force.

• Heavy-duty appliance or automotive housings: The hard SKH51 base material and HW coating support edge integrity and reduce surface wear in long production runs.
• Progressive and transfer injection tooling: Use this variant when ejection reliability must remain stable despite frequent actuation and higher loads.
• Multi-cavity molds with tight ejector alignment: Ball-lock retention improves positional stability, helping avoid inconsistent part release.

The HW coating is specifically suited for areas with sliding wear, while the SKH51 hardened steel construction helps maintain performance over demanding die life requirements.

This product is manufactured from SKH51 steel with an HW coating. SKH51 is an AISI M2 equivalent high-speed steel grade, selected for its high hot hardness and good abrasion resistance in wear-focused tooling applications.

• Wear resistance vs. toughness: The high-hardness nature of SKH51 improves sliding wear performance, but it requires careful attention to load levels to avoid brittle edge chipping in extreme impacts.
• Coating role: The HW coating adds additional surface durability, targeting wear at the sliding contact regions where ejector punches commonly experience material loss.

Heat treatment is typically performed to reach a tool steel hardness suitable for hardened punch service; coating is then applied for enhanced surface life. Exact hardness (HRC) is not provided in the input data, so engineers should confirm with the supplier’s material certification for precise HRC requirements.

Select the ejector punch dimensions by matching the shank diameter (D) and the effective tip geometry to the mating bore and the ejector plate layout. Available shank diameters are D = 10, 13, 16, 20, 25 mm, so choose the diameter that fits the ejector bore design and maintains proper guidance.

• Tip shape and size: Choose from Round, Rectangle, Oblong, Double Flatted Round, Radius Rectangle with tip dimension P = 3 ~ 18 mm and tip width W = 3 ~ 6 mm (with corresponding alteration values PC and WC).
• Length and clearance: Use the appropriate shank length B (listed as L or S) and select the L dimension range (e.g., 80 ~ 100, 71 ~ 100, or other provided ranges) based on available stroke and die thickness.
• Full length alteration (LC): Confirm LC = 54 ~ 99.9, 57 ~ 99.9, 60 ~ 99.9, or 63 ~ 99.9 to align with your build height and machining allowances.

Because this component is precision-machined for die fit, verify the intended tolerance class for D and length features against your ejector bore and plate flatness requirements.