Center Dowel Ejector Punches - Metric, XCDP Coating

Center dowel ejector punches are used in injection mold toolsets where reliable ejection and tight die alignment are critical. In automotive connector and terminal housing molds, the center-guiding geometry helps maintain stable punch travel during high-cycle ejection, reducing misalignment-driven wear.

In appliance and consumer electronics enclosures, this variant’s XCDP coating supports longer running time by improving surface durability against friction and repeated sliding contact. The fixed-length punch body combined with selectable tip shapes supports consistent fit into standardized die/punch layouts.

• Die alignment reinforcement during cycling for connector and terminal molds
• Durability-focused ejection in high-wear housings using XCDP-coated running surfaces
• Metric compatibility for common die and punch layout standards

The provided specifications focus on geometry and coating rather than a specific steel grade. For this reason, material selection and heat treatment should be confirmed against the supplier’s material/process certificate for the exact series/stock item.

What can be stated from the variant information is that the XCDP coating is selected to enhance wear resistance at the working surface. In dowel-guided ejector applications, this typically improves running durability where repeated contact, sliding friction, and debris exposure accelerate abrasive wear.

• Heat treatment: Verify pre-hardened or quenched-and-tempered state for the underlying punch steel for best toughness vs. hardness balance.
• Hardness & toughness trade-off: Higher surface hardness generally increases wear resistance but can reduce toughness if the base steel is over-hardened.
• Wear resistance focus: XCDP coating targets long-term surface stability during repeated ejection cycles.

Select the center dowel ejector punch dimensions by matching the die/core geometry and available installation space, using the series’ fixed and variable measures. The overall length L is fixed in the range 71 to 130 mm; choose the length that provides full working engagement without bottoming in the pocket or violating clearance to the stationary plate.

Match the shank diameter D (mm) to the reamed dowel/bushing and guide bore size requirements: 10, 13, 16, 20, 25, or 32 mm. For the front contact/point feature, choose the tip shape (H, J, K, L, N, O, R, V, X, Y, Z) and set the point length L1 to 19–25 mm or 25–30 mm depending on engagement depth.

• Width/step dimensions: P (4–16 mm) and W (4–10 mm) must clear nearby features while maintaining the intended guidance profile.
• Radius/contact control: R is selectable across multiple ranges (0.2–4.975 up to 0.2–15.975 mm), affecting fit and stress distribution.
• Tolerance/fit: Confirm the intended clearance/interference with your die’s guide bore and ejector plate tolerances; for dowel-like guidance, guide alignment is more sensitive to fit errors than general ejector punches.