SKD11 Equivalent Steel Ejector Punch Blanks with Locating Dowel Hole

These ejector punch blanks with a locating dowel hole are used in progressive and transfer tooling where repeatable center positioning is critical for ejector actuation. The integrated dowel-hole layout helps maintain stable alignment within the ejector system, reducing drift during high-cycle punching and blanking.

Common scenarios include automotive and appliance sheet-metal blanking, where frequent strip feed and fast press cycles demand punches that stay concentric for consistent part edges. The SKD11-equivalent steel construction is suited to this because it offers strong wear resistance under abrasive metal contact.

They are also appropriate for metric die-building using SPB-C-style punch blank geometry, particularly when building dies that require standardized interfaces for easier maintenance and repeatable assembly. With the stated m5 tolerance for shank diameter, these blanks support dependable fit between punch components and their guiding parts.

• Use the dowel hole for locating and concentricity in ejector systems
• Match shank diameter tolerance for reliable die assembly
• Employ in high-cycle punching/blanking dies using metric standards

This part is made from SKD11-equivalent (D2) tool steel, a common choice for punch and die wear applications due to its balance of hardness and abrasion resistance. While exact hardness isn’t specified in the data provided, D2-class steels are typically selected and heat treated to achieve high surface hardness for punching/blanking contact.

Material behavior and trade-offs for die steel like SKD11 include:

• Wear resistance: generally strong due to high carbide content, supporting longer service intervals in abrasive sheet-metal punching
• Toughness: usually lower than lower-alloy steels; designs often rely on proper support and alignment to limit chipping
• Heat treatment: commonly quenched and tempered to reach working hardness, with optional surface treatments (e.g., nitriding) sometimes used in tooling practice depending on wear mode

If compared to softer steels, SKD11/D2 typically provides superior wear performance, but requires attention to alignment and load to manage toughness sensitivity.

Select dimensions by matching the punch blank interface to the die’s guided/ejector components while respecting the specified ranges. The key variable is D (shank diameter), available from 10 to 45 mm, which must be chosen to fit the corresponding guide/bushing or holder geometry in your die set.

The length is defined as L = 40 to 150 mm. Choose L to ensure adequate working projection and full engagement through the ejector stack, while keeping sufficient clearance from surrounding die members during press strokes.

Also verify the LC (full length alteration), fixed at 20 to 149.9 mm in the product line, to align with your design’s required overall dimensional adjustment. The stated m5 shank diameter tolerance indicates a controlled fit; plan mating parts with appropriate clearance/press-fit strategy based on your die build practice.

• Step 1: pick D within 10–45 mm for guide interface compatibility
• Step 2: choose L within 40–150 mm for required engagement/projection
• Step 3: confirm LC within 20–149.9 mm for your stack-up/alteration needs