HW Coating Single-Stepped Shoulder Punches

These HW-coated single-stepped shoulder punches are used in precision die sets where stable punch seating and repeatable alignment are critical. The single-stepped shank geometry helps lock the punch position against the holder, supporting consistent contact and guidance during each stroke.

• Automotive/industrial punching stations: Ideal for high-cycle forming and blanking where wear at the punch tip and guiding surfaces reduces dimensional stability. The HW coating improves surface durability for longer production runs.
• General die work and press tooling: Suitable for setups requiring reliable positioning and tight punch-to-holder fit, helping maintain process repeatability across batches.
• Mass production components: The shoulder-based seating supports uniform engagement, reducing variation caused by seating drift over time.

Select this variant when you need both consistent seating (single step) and improved wear resistance in punch and press tooling environments.

Available materials include SKH40 equivalent (powdered high-speed steel) and SKH51 equivalent (M2). Both are high-speed steels suitable for punching and forming due to their balance of hardness and toughness, but their wear performance can differ by grade.

• SKH51 (M2 equivalent): Typically selected for higher wear resistance in abrasive or high-load cycles, with a hardness commonly around HRC 61–63 after proper heat treatment.
• SKH40 equivalent: Often chosen when toughness and cutting/punching performance are balanced for die work demanding reliable behavior across varying cycle loads.

After machining, punches are generally quenched and tempered to achieve the target HRC, then finished to final dimensions. For wear-prone service, HW coating adds an additional surface durability layer, improving resistance at the guidance and tip regions while maintaining the steel’s core toughness.

To select the correct punch size, start with the shank diameter D and the tip dimension matching your die opening and cutting geometry. This range supports D = 3 ~ 25 mm, with a shank diameter tolerance of +0.005/0, m5 for controlled fit in the holder.

• Tip geometry: Choose tip shape (round, rectangle, oblong, double flatted round, radius rectangle) and match P = 1 ~ 18 mm, plus W = 1 ~ 6 mm and corner radius R = 0.05 ~ 0.15 mm where applicable.
• Length matching: Select the appropriate L range (examples: 40–100, 50–100, 60–100, and others provided) to ensure full engagement and proper seating in your punch holder.
• Full length alteration: Use LC, LCT, LMT = 27 ~ 70.1 mm to align total length changes to your die set stack-up.

Because the shank is m5-rated, verify holder bore and seating design so the controlled diameter tolerance supports consistent guidance without excessive clearance.