Single-Stepped Shoulder Punches - RW Coating

Single-stepped shoulder punches are used in injection and die tooling where long-term dimensional stability under repeated impact is critical. The stepped shank and shoulder seating help keep the punch aligned in the press/platen system, reducing drift during high-cycle production.

• Progressive die punching for heavy-load parts: Choose this variant when wear resistance and repeatable location are needed. The RW coating option supports longer service life compared with uncoated tools, especially where abrasive debris is present.
• Automotive and appliance forming operations: Tip shapes such as double flatted round, rectangle, oblong, and radius rectangle allow engineers to match clearance and cutting geometry for controlled blanking.
• Precision forming fixtures: The stepped shoulder promotes consistent seating, supporting accurate hole formation and stable punch retraction for repeat runs.

Built from SKH51 (M2 equivalent) or SKH40 hardened steel with a reliable stepped shank, this punch series is suited for applications balancing wear resistance, guidance stability, and consistent punch-to-cavity positioning.

This punch series is available in two hardened tool-steel options: SKH51 (M2 equivalent) and SKH40 (powdered high-speed steel). Both provide high wear resistance for punching, but their performance emphasis differs based on hardness and toughness balance required for the load profile.

• SKH51 / M2: Typically selected for aggressive wear environments; high hardness improves resistance to tip rounding under repeated cutting.
• SKH40 (powdered HSS): Often chosen when you want strong wear behavior with reliable manufacturing consistency from powdered metallurgy.
• RW coating: Adds surface protection to help reduce abrasive wear and scuffing at the punch working face.

Heat treatment is supplied as hardened tool-steel state (per the SKH51/SKH40 hardened designation), designed to achieve a high-hardness condition while maintaining practical toughness for punching impacts. If your cycle includes heavy edge loading, keep the coating and hardened grade aligned to avoid premature chipping or loss of edge stability.

Select dimensions by matching the punch tip and shank geometry to the die opening and the punch holder seating requirement. This series supports D (shank diameter) = 3 ~ 25 mm with a specified fit tolerance of +0.005/0, m5, so verify holder bore and alignment features to ensure consistent guidance.

• Choose tip shape: Round, Rectangle, Oblong, Double Flatted Round, or Radius Rectangle based on the required hole/profile (P and W/WC govern fine tip geometry).
• Match tip dimensions: Use P = 1 ~ 18 mm and tip corner radius R = 0.15 mm; apply tip width parameters W = 1 ~ 6 mm and corresponding alteration WC = 1 ~ 3 mm when selecting variants.
• Set length and seating: Head-related length options include L = 40 ~ 100, 50 ~ 100, 60 ~ 100, 70 ~ 100 mm depending on the variant, with LC = 27 ~ 47 mm and tolerance change ranges LCT/LMT = 27 ~ 47 mm.

For stable repeatability, ensure the shoulder location corresponds to your die set height so the stepped design seats correctly; confirm any configurable alterations (e.g., PC 1 ~ 9, WC 1 ~ 3) are consistent with cavity/core stack-up.