Double-Stepped Shoulder Punches (DLC + WPC)

Double-stepped shoulder punches are used in mechanical and hydraulic press tooling where punch-to-die alignment and repeatable stroke geometry are critical. The double-shoulder shank design supports stable seating in standard guide bushings, helping maintain clearance and positioning across repeated cycles.

• Automotive and appliance sheet metal punching: choose this variant when forming operations demand reduced scuffing and consistent punch engagement. The DLC + WPC surface treatment improves wear resistance for long production runs.
• Electrical connector and terminal blanking: the double-stepped geometry helps control tool location under load, supporting predictable part dimensions and less variation during high-frequency presses.
• General forming and fine trimming operations: where wear from sliding contact is a concern, the coated punch surface helps reduce rubbing-related damage while retaining the punch’s dimensional stability.

Overall, the combination of a double-stepped shoulder and DLC + WPC coating makes this style well-suited for durability-focused punching applications.

This punch is available in SKH40 Equivalent (powdered high-speed steel) or SKH51 Equivalent (M2). Both options target high hardness for punching/blanking, with the coated surface used to further manage wear at sliding interfaces.

• SKH51 Equivalent (M2): known for balanced wear resistance and toughness; typically selected when abrasion and edge durability are primary concerns.
• SKH40 Equivalent: powdered processing supports consistent microstructure, commonly chosen for reliable cutting performance.

For heat treatment, these steels are typically supplied after hardening and tempering to achieve the intended cutting-tool hardness (final hardness should be confirmed on the work order). With DLC + WPC on the working surfaces, the main trade-off shifts toward improved wear resistance and lower friction, while toughness remains governed by the steel’s hardened/tempered state.

Do not confuse coating wear reduction with edge toughness—impact-heavy operations still require selecting the appropriate steel grade and heat treatment.

Select dimensions to match the punch stroke geometry and the die/bushing interface requirements. Start with the shank diameter D (range 3 ~ 25 mm) and verify the required fit: the listed tolerance is +0.005/0 with m5 grade guidance, so measure your guide bushings and holes accordingly.

• L (overall L dimension): choose from 40 ～ 80 or 40 ～ 100 mm depending on press linkage and required protrusion.
• Head geometry: use B (range 2 ～ 35, 2 ～ 45, 2 ～ 60, etc.) plus the P (0.5 ~ 9) and R (0.15) features to match the shoulder contact and working clearance.
• Full-length alteration controls: LC (30 ~ 70.1) and LCT/LMT (30 ~ 70.1) indicate how total length/thickness tolerance changes for the specified tooling stack-up.

Finally, confirm tip shape (Round, Rectangle, Oblong, Double Flatted Round, Radius Rectangle) and dimensions F, V, W so the punch lands in the intended die opening without interference.