Heavy Load Punch Blanks - Metric (Diameters 10-25 mm)

These heavy-duty punch blanks are used in injection mold tooling and press-related operations where the punch must resist wear and maintain dimensional stability during repeated cycles. The blank shank is intended for standard mounting part shapes, making them suitable for punch tool builds that require predictable seating and alignment.

• Automotive and industrial connector housings: Use them in tooling inserts for knock-out, trimming, or forming steps where consistent cutting edges and stable punch position reduce variation across production runs.
• Appliance and electronics housings: Their heavy-load design supports longer service intervals in workflows that combine intermittent high force with tight assembly fit requirements.
• Thick-feature plastic components: The fixed 8 mm head thickness helps maintain punch stiffness for forming or material shearing actions under load.

For these applications, the metric diameter range (10–25 mm) and the available M2 (SKH51 equivalent) or SKH40 (equivalent) high-speed steel options help match expected abrasion and edge-retention needs.

This series offers two high-speed steel material options. SKH51 equivalent (M2) is a powdered high-speed steel variant known for strong wear resistance and balanced toughness, making it suitable for demanding punching and trimming cycles. SKH40 equivalent targets durable performance as well, typically with a different balance of hardness and edge retention depending on the exact heat treatment.

• Hardness (HRC): The exact hardness level is not specified in the provided data; final hardness is set by the supplier’s heat treatment for each grade.
• M2/SKH51: Commonly used where cutting edge stability and abrasion resistance matter most under heavy load.
• SKH40: Consider when tool life is needed with emphasis on the grade’s preferred performance window.
• Heat treatment state: Heat treatment for these powdered high-speed steels is grade-dependent (e.g., hardening followed by tempering is typical for HSS punches), but the specific state is not stated in the provided specifications.

Choose between grades based on wear vs. toughness trade-offs for your cycle force, abrasive content, and required edge life.

Select the punch blank by matching the shank diameter D and overall length dimensions to your punch holder/tooling insert geometry. The available D range is 5–25 mm, with options that include standard mounting integration through the specified blank shank type.

• Choose D: Start from the required shank diameter for the holder bore/seat; order the blank within D = 5–25 mm that matches your design target.
• Check length L: The L dimension is offered in 50–80 mm and 50–100 mm. Ensure L provides clearance for press tooling stack-up and avoids interference with neighbors.
• Set full length adjustment LC: The LC (full length alteration) range is 20–79.9 mm or 20–99.9 mm; match this to the allowable rework/variation in your assembly.

Tolerance & fit: The shank diameter tolerance is +0.005/0 and also supports m5 selection. For tight alignment, use the defined tolerance when specifying the mating holder bore to achieve a stable press fit without excessive binding.