Metric Center Dowel Ejector Punches with XNA Coating

These metric center dowel ejector punches are used in injection mold tooling where repeatable alignment and controlled ejection are critical. The center dowel-style guidance helps keep the punch axis stable, reducing side-loading during fast cycling.

• Automotive connector and housing molds: When ejector systems must move reliably across dense runner/gate layouts, the stepped geometry with available tip shapes (H, J, K, L, N, O, R, V, X, Y, Z) supports consistent engagement and smooth release, helping minimize scuffing on the guide surfaces.
• Appliance and industrial component molds: The shank diameter range (10–32 mm) and shank length range (71–130 mm) allow matching to specific mold and stack heights, supporting stable transfer of ejection force without excessive deflection.
• Precision consumer goods molds: The XNA coating is suited to long production runs because it improves surface durability under repeated sliding contact between the punch and its guide components.

Choose the corresponding shank diameter and point length to match your ejection stroke and guide hole requirements for the best alignment results.

The input data specifies the XNA coating on these metric ejector punches, but it does not provide the underlying steel grade or heat-treatment state. As a result, material hardness (HRC) and specific alloy equivalency (e.g., SKD61/H13) cannot be stated from the available information.

• XNA coating relevance: XNA is selected to improve wear resistance and reduce surface degradation from repeated punch-to-guide sliding in high-cycle molds.
• Coating vs. substrate trade-off: In guided ejector applications, coating durability generally supports longer service intervals, while substrate toughness governs resistance to bending and chipping under ejection loads.

If you need hardness targets or a specific steel recommendation for your mold (e.g., correlating wear vs. toughness for J6M/J9M groups), provide your operating loads and cycle rate so Axiom Molds can suggest the correct steel/heat-treatment variant.

Correct sizing for center dowel ejector punches is primarily about matching the shank diameter, overall length, and the working point length to the mold’s guide system and required ejection travel.

• Choose shank diameter (D): Select D from 10, 13, 16, 20, 25, or 32 mm to fit your corresponding ejector guide bore diameter and maintain stable alignment.
• Select overall length (L): Use L = 71–130 mm based on your mold and stack height so the punch fully supports guidance through the ejection stroke.
• Match point length (L1): Pick L1 within 19–25 mm or 25–30 mm to ensure proper penetration/engagement without bottoming in the parting or stripper zone.

For detailed geometry, also confirm the variable dimensions P (4–16 mm), W (4–10 mm), and tip-related R (0.2–4.975 to 0.2–15.975 mm ranges), which affect the functional clearance and tip contact profile. Maintain appropriate fit based on your guide design tolerance class; use your existing drawings to verify clearance between shank OD (D) and the guide bore.