Single-Stepped Shoulder Punches (DLC + WPC Coating)

Single-stepped shoulder punches (DLC + WPC surface treatment) are used in forming and trimming stations where repeatable punch positioning directly affects part geometry. The single-stepped shank helps the punch seat consistently against the die set, reducing drift under cycling loads.

• Automotive and appliance forming dies: suited for producing stamped features where wear at the punch face and die contact must remain stable over long runs; the DLC + WPC coating supports durable wear life in abrasive conditions.
• Connector and tab punching: for press tooling that requires tight alignment and reliable shoulder contact; the geometry maintains alignment during repeated pierce/form cycles.
• General sheet-metal blanking stations: when tool steel base performance is needed along with a low-friction, wear-resistant surface to manage tool degradation.

Choose this variant when your process demands stable shoulder seating and improved surface wear resistance for consistent forming results.

These punches are offered in two tool steel grades: SKH40 equivalent (powdered high-speed steel) and SKH51 equivalent (M2). Both serve as hardened tool steel bases, with the DLC + WPC coating added to improve surface durability in die-contact areas.

• SKH40 (powdered HSS equivalent): typically selected for balanced wear resistance and toughness; the microstructure from powder metallurgy supports consistent tool performance.
• SKH51 (M2 equivalent): commonly used where higher wear resistance is required; trade-offs often include tighter process control to maintain toughness under impact loading.

Coating shifts the wear mechanism toward the treated surface, helping reduce abrasion and adhesive wear at the punch tip while retaining the substrate’s hardened performance.

Select the punch based on the required shank diameter, tip geometry, and overall head-to-length relationship to your die cavity/core design. The available shank diameter D is 3 ~ 25 mm with a tolerance of +0.005/0, m5, so match it to the guide/bushing and ensure clearance is designed for the m5 fit behavior.

• Tip shape: choose from round, rectangle, oblong, double-flatted round, or radius rectangle to match the functional edge/contact area in your forming die.
• Tip length (B): available as L, S, X—pick the option that provides the needed penetration length without overexposure.
• Overall length controls: use LC (27 ~ 90.1 mm) and head-thickness tolerance alteration values (LCT or LMT, each 27 ~ 90.1 mm) to align total tool stack-up with your die height.
• Tip dimensions: set P (1 ~ 18 mm), PC (1 ~ 9 mm), W (1 ~ 6 mm), WC (1 ~ 3 mm), and R (0.15) to achieve the specified feature size.

When multiple dimensions can vary per variant, confirm both the seating shoulder geometry and the total length alterations so the punch contacts the die at the intended depth.