Punches with Key Grooves Single-Stepped Shank

These single-stepped shank punches are used in progressive and compound injection blanking dies where punch-to-cavity alignment must remain stable over high cycle counts. The keyed mounting section guides the punch repeatably, reducing drift and improving stroke-to-stroke consistency during metal removal operations.

• Automotive connector and terminal tooling: When punching thin strip parts into precision features, the single-stepped shank supports controlled seating and reliable feed-through through the die set.
• Electrical contact carriers and brackets: The key groove mounting helps prevent misalignment under repeated loading, which supports dimensional stability of small tip geometries.
• General industrial housings and brackets: For production runs requiring robust wear resistance at the cutting edge, selecting SKD11-equivalent or SKH51-based variants helps balance edge life with toughness for uninterrupted blanking.

The variant selection is suited for these scenarios because the keyed interface improves guidance, while the available tool steels target wear resistance needed at the tip under cyclic contact.

Tool materials offered for this punch include SKD11 equivalent, SKH51, and powdered high-speed steel, enabling trade-offs between toughness and wear performance at the cutting edge. SKD11 is a widely used cold-work tool steel grade (H13-equivalent class for many applications), providing good toughness with high wear resistance for standard progressive die blanking.

• SKH51 (high-speed steel): typically higher red-hardness and wear resistance than SKD11-class steels, with a toughness trade-off depending on final heat treatment.
• Powdered high-speed steel: finer carbide distribution can improve wear resistance and surface stability versus conventional cast HSS.

Common heat-treatment routes for these grades are quenched and tempered for the tool steel options, while high-speed steels are generally heat-treated and hardened for high hardness (often targeting the high-HRC range) to maximize cutting-edge durability. Final hardness and toughness depend on the selected steel and the supplier’s specific tempering parameters.

Correct selection starts by matching the shank diameter D and fit tolerance to your die bushing or guide opening. Available shank diameters are 3 ~ 16 mm, with a specified tolerance of +0.005/0, m5; select the mating support so the punch is guided without excessive clearance.

• Overall length: Use L (40 ~ 60 mm) and the specified LC (full length alteration) ranges (e.g., 27 ~ 79.9, 27 ~ 99.9, 32 ~ 79.9, 32 ~ 99.9, or 32 ~ 99.99) to match the required press-fit depth and stack height in the die set.
• Cutting geometry: Choose Tip shape (A, D, E, G, R) and tip dimensions P (1 ~ 10 mm), W (1 ~ 5 mm), and B (tip length: L/S/X) to match your cavity/core profile.
• Key groove position: Align T (key groove position) within the available ranges (e.g., 5.1 ~ 80 or up to 5.1 ~ 100) so the keyed interface engages at the designed guidance height.

If your design uses dimensional offsets, account for alteration parameters such as PC (0.5 ~ 5), WC (0.8 ~ 2), and the length/tolerance change behavior indicated by LCT to maintain consistent fit and edge engagement.