Short Shoulder Punches (HW Coating)

Short shoulder punches are used inside injection mold tooling where a controlled, shallow penetration is needed to form features such as bosses, ribs, or localized knockouts. The single-stepped shank geometry improves guidance and helps maintain stable motion, which is critical when parts demand repeatable forming in high-cycle production.

These HW-coated punches are well-suited for automotive connector and harness housing molds, where the punch tip must resist abrasive wear from repeated ejection/forming and protect the downstream steel surfaces. The engineered tip shapes (round, rectangle, oblong, double-flatted round, radius rectangle) allow designers to match the contact area to the clearance and part geometry.

• Heavy-load molding: HW coating helps reduce wear during continuous operation.
• Micropocket/feature formation: short shoulder head supports consistent forming depth (LC range 17–39.9 mm).
• Multi-cavity builds: stable guidance from the single-stepped shank supports uniform results across cavities.

This punch is available in hardened high-speed steel options suited for wear-heavy punch work. The SKH51 equivalent (M2) grade is typically selected when higher hot hardness and toughness balance are required for demanding cycles; it is supplied as hardened steel (use the product variant corresponding to the SKH51/M2 option).

The SKH40 equivalent variant is offered as a powdered high-speed steel option. Powdered HSS typically provides fine carbides and good wear resistance, improving performance for abrasive contact, though toughness can be sensitive to the final hardness and the application load profile.

• Wear resistance: improved by HW coating plus hardened HSS selection.
• Toughness trade-off: harder states generally improve wear but may increase chipping risk under shock loads.
• Recommended heat-treatment state: hardened (for SKH51/M2) or hardened powdered HSS (for SKH40 equivalent), then finished to form the punch geometry and coating-ready surface.

Correct sizing centers on matching the punch shank diameter D, the tip/head length, and the tip geometry to the mold cavity/core feature. Available shank diameters are D = 3, 4, 5, 6, 8, 10 mm, and the shank diameter tolerance is +0.005/0 with m5, so you must size the mating bore accordingly to achieve the intended sliding/locating fit.

Select the tip length via B (tip length) = L or S, then confirm the overall lengths using the fixed LC (full length alteration) = 17 to 39.9 mm. Because L (L dimension) is variable (30–40 mm or 25–40 mm depending on the configuration), verify that the punch fully covers the required forming depth without bottoming on the cavity support.

• Match P (tip dimension) within 1–7 mm to the intended contact width/length.
• Choose corner R from the provided ranges (0.15–4.97 mm) to control stress concentration.
• Select W (tip dimension) to fit the part feature and clearance envelope.