Heavy Load Ejector Punch Blank with Center Dowel Hole

This heavy-load ejector punch blank is used in metric die builds where the punch must be rigidly supported and repeatedly positioned during pressing. The center dowel hole enables stable alignment with the die set, helping prevent punch-to-cavity misregistration under cyclic load.

• Automotive and industrial stamping: suitable for long-running production where wear and alignment consistency are critical; the blank’s locating feature supports repeatable ejector motion and punch engagement.
• High-cavity-count progressive dies: helps maintain dimensional stability across stations by ensuring the blank seats consistently in the tooling.
• General die tooling for formed parts: a practical choice when you need a metric-compatible blank with an internal locating interface for reliable assembly.

Choose the SKH51 (M2-equivalent) grade when you expect higher impact/abrasive wear; select SKH40 powdered HSS (equivalent) when you prioritize uniform microstructure and wear resistance for punch edges.

Two hardened steel options are available for this metric punch blank. SKH51 is supplied as an M2-equivalent high-speed steel commonly chosen for strong hot-work and wear resistance; it is typically used in quenched & tempered condition to achieve a balance of hardness (HRC), toughness, and tool life. SKH40 powdered HSS (equivalent) offers improved wear behavior and microstructural uniformity characteristic of powdered grades, supporting consistent performance under abrasive contact.

• Wear resistance: Powdered HSS variants tend to provide stable abrasion resistance for punch applications.
• Toughness trade-off: Higher hardness improves wear life but can reduce resistance to edge chipping under severe impact; proper heat treatment and edge design are essential.
• Hardness (HRC): Refer to the provided hardened steel grade for final HRC after supplier heat treatment.

Both materials target dimensional stability and resistance to deformation during ejector cycles.

Select the blank by matching the shank diameter D and overall dimensions to your die’s punch holder and support geometry. Available D values are 10, 13, 16, 20, and 25 mm, so choose the diameter that corresponds to your m5 shank diameter fit requirement for stable press assembly.

• L (L dimension): fixed range 50–100 mm. Use L to achieve the correct protrusion and engagement depth in the punch holder.
• LC (full length alteration): fixed range 20–99.9 mm. Set LC so the center dowel hole position aligns with the locating features in your die set.

Confirm that your die block and core/cavity layout provide clearance for the blank length while maintaining consistent seating on the center dowel hole. Where fit is critical, maintain the intended m5 diameter relationship to avoid binding or loss of alignment under load.