Large-Diameter Pin Type Ejector Punch Blanks

Large-diameter pin ejector punch blanks are used in injection mold tooling to provide stable, repeatable guidance for ejector components—especially where higher lateral loads or longer ejection strokes can otherwise lead to misalignment. In automotive and appliance housings, these pin-type blanks help maintain straight punch travel during frequent ejection cycles, reducing the risk of uneven wear on guide interfaces.

• Standard type suits predictable load profiles for progressive and transfer tooling where guidance stability is the main requirement.
• Spring reinforced type is a better match when the design benefits from additional compliance to help tolerate part-to-part variation during ejection.
• For metric die inserts and center-dowel workflows, the shank blank layout supports straightforward integration with common ejector punch blank processes.

The availability of SKD11 (D2), SKH51 (M2), and SKH40 allows you to align wear resistance and toughness with your expected cavity pressures and ejection frequency.

This ejector punch blank is offered in multiple high-wear steel options commonly selected for die and punch work in metalforming- and injection-adjacent tooling. SKD11 equivalent (D2) is a high-carbon, chromium die steel focused on wear resistance; it typically balances toughness and abrasion resistance when properly heat treated. SKH51 equivalent (M2) (high-speed steel) provides excellent hot wear resistance and tool-life under repetitive sliding, while SKH40 (powdered high-speed steel) emphasizes improved cleanliness and wear performance from powder metallurgy.

• Heat treatment state is selected to reach the target hardness for punch guidance; typical practice is quenched and tempered for die steels (e.g., D2) and quenched/tempered** for HSS grades.
• Hardness (HRC) trades off between wear resistance and toughness: higher hardness generally improves scuff and abrasion resistance, but can reduce impact tolerance.
• Brief comparison: D2 is cost-effective for wear; M2 and SKH40 are better choices where severe repetitive friction and longer life are required.

To select the correct large-diameter pin ejector punch blank, start by matching the shank diameter D to your guide/bushing bore and alignment requirements. The available D range is 4 ~ 25 mm, and the shank diameter tolerance is +0.005/0 with m5 fit. Use this to confirm clearance/press fit so the punch remains straight under ejection load.

• Match length L (available 40 ~ 80 mm) to your mold base stack-up and required protrusion.
• Select the S dimension within 13 ~ 50 mm to align the working interface with your cavity/core geometry.
• Choose LC (full length alteration) from the provided ranges: 40 ~ 79.9, 40 ~ 99.9, 30 ~ 79.9, or 30 ~ 99.9, based on the adjustment needed for final assembly.

Dimensions like the specification (large-diameter pin type) are fixed, while ejector type, material, and key geometry parameters are configurable per requirement.