Key Flat Shank Shoulder Punches (DLC Coating)

These key-flat shank shoulder punches are used in press and progressive die stations where repeatable punch positioning is critical. The single-stepped shank with a key-flat mounting stabilizes seating in the guide plate/bushing area, helping maintain alignment over high-cycle production.

• Progressive dies & transfer tools: Select DLC-coated variants to improve abrasion resistance at the punch tip during repeated piercing and forming cycles.
• Automotive and appliance sheet-metal forming: The stable key-flat interface supports consistent head-to-tip orientation, reducing positional variation that can affect formed hole geometry.
• Precision punch-forming lines: DLC (and optional DLC + WPC) helps limit wear at the contact surfaces, supporting longer intervals between punch refurbishment.

Choose the material and coating combination (SKH40-equivalent or SKH51/M2-equivalent with DLC) based on expected cycle count and abrasive load.

Available materials include SKH40 equivalent (powdered high-speed steel) and SKH51 equivalent (M2). SKH51/M2 typically offers higher hot hardness and improved wear performance, while SKH40-equivalent can be selected where toughness balance and tool life are prioritized for moderate wear conditions.

• DLC (XCD) coating: Provides a hard, low-friction surface layer to reduce abrasion at the punch tip and shank contact regions.
• DLC + WPC: Adds an additional performance layer for further wear reduction in severe cutting/impact regimes.

Heat treatment is specified by the provided material grade choice rather than separate process states in the input data. In general, high-speed steel punches are manufactured with heat-treated tool steel for hardness and toughness trade-offs, and the coating increases surface durability under repeated cycles.

To select the correct punch, match both the shank diameter D and the tip geometry to your die set and form requirements. This product supports D = 3 ~ 25 mm and tip dimension ranges of P = 1 ~ 18 mm, depending on the selected tip shape (Round, Rectangle, Oblong, Double Flatted Round, Radius Rectangle).

• Tip length B: Choose from available B variants (L, S, X) to ensure sufficient engagement through the stripper/bushing and correct support at the shoulder.
• Overall length L: Available in multiple bands (e.g., 40 ~ 100, 50 ~ 100, 60 ~ 100, 70 ~ 100) to suit press stroke and die stack height.
• Full length alteration LC and length-related tolerance parameters (LCT, LMT): ranges are 27 ~ 99.9 and 32 ~ 99.9, respectively.
• Tip dimensional alterations PC (0.8 ~ 9) and WC (0.8 ~ 3) account for selected tolerance/fit characteristics.

Use the key-flat shoulder seating to maintain repeatable alignment; ensure the selected D and tip dimensions align with your cavity/core clearance and stripper guidance requirements. Coating selection (DLC vs. DLC + WPC) should match your wear expectations.