Ejector Punch Blanks for Heavy Load with Dowel Hole

These ejector punch blanks are used in injection and pressing tooling wherever a clean ejection stroke must stay aligned under elevated cutting and wear conditions. The heavy-load blank configuration is well-suited for automotive connector and bracket molds, where ejector components repeatedly cycle against wear from core/cavity surfaces and require stable guidance through reinforcement.

They are also a practical choice for electrical insulator and housing molds that use guided ejector layouts. The dowel hole supports accurate positioning of the blank during assembly, helping maintain consistent ejection timing and reducing risk of misalignment when loads rise.

For medical device housings and other precision parts, the powdered high-speed steel (SKH40 equivalent) variant supports wear resistance over long production runs, while the reinforced shank fit and defined tolerances help keep ejection reliable across repeated mold temperature cycles.

• Heavy-load design maintains geometry stability under demanding punch/ejector duty
• Dowel hole improves assembly repeatability in guided layouts
• SKH40 equivalent powdered HSS supports durable wear performance

This product uses powdered high-speed steel (SKH40 equivalent), selected for its high hot hardness and strong resistance to abrasive wear in high-cycle tooling. Powder metallurgy processing refines carbides, which improves wear behavior compared with more conventional HSS variants for many punching/ejection applications.

In service, this material trades some toughness for hardness and wear resistance, so it performs best when guidance and load distribution are managed by the reinforced blank shank and dowel-hole positioning.

• Material grade: SKH40 equivalent powdered high-speed steel
• Typical heat treatment state: quenched and tempered to achieve working hardness suitable for punch/ejector duty (final hardness depends on the supplied grade/process)
• Wear vs. toughness: higher hardness improves abrasion resistance; toughness is lower than many lower-alloy structural steels

When comparing alternatives, powdered HSS variants generally provide better wear consistency than non-powdered HSS, while still requiring correct heat treatment to reach target hardness.

Select dimensions by matching the ejector shank to your die/core ejection layout and the dowel-hole based assembly scheme. Start with the D (shank diameter) from the available set: 8, 10, 13, 16, 20, 25 mm. Your die plate and the ejector bore should be specified to accept the shank fit with tolerance +0.005/0 and m5 reference, ensuring controlled assembly without excessive clearance.

Next, choose the L (length) that covers your stack-up and required stroke reach. The catalog offers multiple L ranges depending on the configuration: 50–130, 50–100, 70–130, 80–130, 70–100, 80–100 mm. Confirm that the chosen length clears adjacent components through the full ejection movement.

• S dimension: available as 28, 36, 40, 50 mm—use to match your guided support/step geometry
• LC (full length alteration): choose within 40–99.9, 50–129.9, 50–99.9, 40–129.9 mm to accommodate your machining and assembly allowances
• Variable options: ejector type (standard vs. spring and pin reinforced) affects how loads are transferred; size the shank first, then confirm reinforcement clearance