JIS Standard D2 Steel Locating Dowel Hole Ejector Punches

These locating dowel hole ejector punches are used in progressive and transfer stamping die sets where repeatable part positioning and consistent stripping/ejection are critical. The stepped shank with a dedicated locating dowel hole helps maintain stable alignment between the punch and the die components, reducing mislocation during frequent press cycles.

In automotive connector and terminal stamping, the WPC-treated surface supports longer wear life at the punch edges while the ejector action remains controlled. The fixed relationship between the punch body and the locating hole is well-suited for high-throughput tooling that experiences cumulative wear and thermal cycling.

• Die making and setup: Choose tip geometry (round/rectangle/oblong or flatted) to match cavity openings and stripping requirements.
• Long service runs: Use the D2 steel base with WPC treatment to balance abrasion resistance and alignment stability.
• Controlled ejection: The ejector punch geometry and tight shank fit support predictable movement through die stations.

This series uses JIS D2 tool steel (often referenced as an AISI D2 class), selected for its high wear resistance in punching and stripping applications. D2 is typically supplied in a hardened condition and then finalized with polishing and surface finishing to ensure smooth engagement with die components.

• Surface treatment: WPC (as specified) is applied to improve wear resistance and support stable punch performance under repeated stamping contact.
• Hardness/behavior: Expect a hardened, abrasion-focused microstructure that resists edge wear; however, toughness is usually traded against hardness compared with tougher grades.
• Heat treatment state: The product is specified as D2 steel with WPC surface treatment; final hardness is achieved through the typical D2 quench-and-temper route used for die steels, followed by finishing.

Compared to more impact-tough steels, D2/WPC is optimized for wear-heavy duty where alignment and repeatability matter more than extreme shock resistance.

Select dimensions to match both punch working geometry and the die set locating interface created by the dowel hole mounting.

• Shank diameter (D): Choose from 10 ~ 45 mm to fit the corresponding die block/tooling guide features.
• Tip geometry: Pick tip shape (Round, Rectangle, Oblong, Double flatted round, Radius rectangle) based on the stamping opening and clearance needs. Use P (tip dimension) 2.5 ~ 35 mm and W (tip dimension) 2.5 ~ 9 mm to match the cavity/core opening.
• Tip length (B): Select L/S/X by required engagement length, then verify B-related dimension range using the provided L (50–150, 60–150, 40–150, 70–150, 80–150) and LC (25–149.9, 37–149.9, 32–149.9) constraints.
• Tolerance/fit: The description indicates an m5 diameter tolerance for the shank; ensure mating features follow an equivalent precision fit to maintain punch alignment.

For best alignment, coordinate the full assembly length (L/LC) with your die stack height so the ejector travel and working position remain consistent across production.