Alpha Treatment Key Flat Shank Shoulder Punches

Shoulder punches are used to create controlled features in precision dies where the punch head-to-shoulder transition defines part geometry and location. In progressive tooling, this style supports repeatable forming cycles because the shoulder provides a consistent seating reference as the punch advances and retracts.

For automotive connector and terminal housing trims, the nanocrystallized surface strengthening is well-suited to resist tip wear and maintain edge shape under high cycle counts. The microtextured surface can also help manage lubrication behavior, supporting smoother sliding through stripper and guide elements.

In electrical bracket and thin-gauge sheet forming, the variant’s focus on preserving punch geometry during cutting helps reduce dimensional drift that can otherwise affect downstream mating fits.

• Use when consistent punch behavior and edge stability are required in precision die sets.
• Match to fine tip dimension ranges (P, W, R) to control small formed features.
• Beneficial where wear resistance and low-friction sliding improve cycle reliability.

This punch series is available in SKH40 Equivalent (powdered high-speed steel), SKH51 Equivalent (M2), and SKD11 Equivalent (D2). The “Alpha Treatment” described for these punches uses nanocrystallization to raise surface hardness and strength while aiming to preserve toughness and punch geometry during cutting and repeated contact.

• SKH51 (M2 equivalent): typically selected for a balance of wear resistance and toughness in high-speed forming.
• SKD11 (D2 equivalent): often chosen when abrasion/edge retention is prioritized (with the usual consideration that tool steels can trade toughness vs. hardness).
• SKH40 powdered HSS: offers fine carbide distribution from powder processing, supporting stable performance under wear.

Heat-treatment state is presented as an Alpha Treatment hardening process (nanocrystallized surface). Specific target hardness values (HRC) and exact tempering parameters are not provided in the supplied data, so selection should be validated against your trial forming results and lubrication conditions.

Selection is driven by matching the tip geometry and shank/head stack dimensions to the die cavity/core and the shoulder seating requirements of your tool. Start with the tip dimension set: choose tip shape (Round, Rectangle, Oblong, Double Flatted Round, Radius Rectangle) and then select P (tip dimension) from 1–18 mm and W (tip dimension) from 1–6 mm, including corner radius R = 0.15 mm when applicable.

• Verify shank diameter D = 3–25 mm fits your guide and clearance. Use a fit that prevents side play while allowing smooth sliding under lubrication.
• Confirm tip length B option (L, S, X) corresponds to your cavity penetration depth.
• Select L (overall length) within the listed ranges (40–100, 50–100, 60–100, or 70–100 depending on configuration).
• Check LC (full length alteration) 27–99.9 mm and the related tolerance-change metrics LCT / LMT (also 27–99.9 mm) if you require length adjustment.

For small geometry tuning, apply PC 0.5–9 mm and tip alteration WC 0.8–3 mm only when your die layout and wear compensation strategy can accommodate the change.