Metric Center Dowel Ejector Punches XNM Coating

Metric center dowel ejector punches are used in precision injection mold tool-and-die assemblies where stable alignment between the ejector system and the die cavity is critical. Their centering geometry helps maintain consistent punch positioning during high-cycle opening and closing, reducing the risk of uneven contact at the ejector face.

• Automotive and appliance connector molds: In long-run production, the ejector punch can see repeated sliding and point loading; the XNM surface coating is suited to improve wear consistency over production cycles.
• Thin-wall consumer parts and housings: When the ejector system must initiate controlled ejection without disturbing the part, the variety of tip shapes (H, J, K, L, N, O, R, V, X, Y, Z) supports tailored contacting behavior.
• High-mix tooling with frequent die changes: The broad overall length range (L = 71 to 130 mm) supports different press and die stack layouts while maintaining center-guided ejector performance.

The provided specification emphasizes the XNM surface coating as the key durability feature for this ejector punch variant. While the exact steel grade and heat-treatment condition are not listed in the input data, XNM coatings are selected for improved wear resistance under repeated sliding contact and cyclic mechanical loading.

• Wear vs. toughness trade-off: Coated surfaces typically enhance abrasion resistance, but the underlying steel toughness still governs impact tolerance during ejection events.
• Manufacturing process (typical for coated punches): The shank and tip are machined to the required geometry, followed by surface preparation and coating deposition to achieve consistent tribological performance.
• Hardness (HRC): Not specified in the provided data, so hardness and tempering targets cannot be stated for this exact item.

Select the ejector punch dimensions by matching the shank diameter, overall length, and point geometry to the ejector plate clearance and the cavity/core penetration depth. This product supports a fixed overall length range L = 71 ~ 130 mm, with a variable point length L1 = 19 ~ 25 mm or 25 ~ 30 mm.

• Shank diameter (D): Choose one of 10, 13, 16, 20, 25, 32 mm to fit your guide bore/retainer diameter while maintaining alignment.
• Point/tip profile: Select the required tip shape (H, J, K, L, N, O, R, V, X, Y, Z) and point dimensions P (4 ~ 16 mm), W (4 ~ 10 mm), and R from the available ranges (0.2 ~ 4.975 up to 0.2 ~ 15.975 depending on configuration).
• Clearance & tolerance: Ensure the chosen D and overall L provide safe clearance through ejector stroke while preserving center guidance. Use your mold’s drawing tolerances for fit in the punch guide/plate; the provided data lists dimension ranges, not specific tolerance classes.