DLC Coating Center Dowel Ejector Punches

This center dowel ejector punch style is used in injection mold tooling where the ejector system must maintain repeatable alignment under continuous cycling. The single-stepped shank with a locating dowel hole supports stable guidance, reducing side loading as the ejector punches move through the die base.

• Automotive connector & sensor housings: Ideal for ejector pins that must return consistently after high-volume molding. The DLC (XCD) coated surface helps manage wear from dry friction and sliding contact.
• Appliance and electronics enclosures: Works well for ejector layouts that require stable core pull-off and tight assembly repeatability. The locating dowel hole alignment is suited to molds where component positioning accuracy directly impacts cycle stability.
• General-purpose die casting and insert molds: Suitable when ejector punch wear limits lifetime and dimensional drift. The variant is engineered for long tool life with SKD11-equivalent wear resistance.

These dowel ejector punches are made from SKD11 equivalent tool steel (commonly associated with the D2 family for practical selection). The tooling-grade chemistry provides a balance of wear resistance and sufficient toughness for ejector punch guidance applications.

A DLC (XCD) coating is applied to the functional surface to improve low-friction sliding behavior and reduce adhesive/abrasive wear. This is particularly beneficial for guided motion where punches repeatedly contact bushings or die steel surfaces.

• Hardness (HRC): not specified in the provided data; actual hardness should be confirmed from the manufacturer’s certificate for your exact SKU.
• Heat treatment: heat treatment state is not specified in the provided data (e.g., pre-hardened vs. quenched & tempered). Confirm the heat treatment condition to ensure the expected wear/toughness trade-off.

Compared with uncoated tool steel, the DLC variant typically improves tribological performance; the underlying SKD11-equivalent toughness level helps prevent brittle failure under ejection loads.

Select dimensions by matching the punch shank diameter to the receiving guide and using the tip geometry to control contact with the molded part and ejector interface.

• Shank diameter (D): choose from 10 ~ 45 mm to fit the guide/bushing bore. If you must maintain assembly fit, verify that your mating hole is designed for the stated fit class (the provided data mentions m5 tolerance for the shank diameter).
• Tip dimensions: pick P (2.5 ~ 35 mm), W (2.5 ~ 9 mm), and corner R (0 ~ 0.15 mm) consistent with your ejector contact area and part geometry. Tip shape options include Round, Rectangle, Oblong, Double flatted round, Radius rectangle.
• Length (L): available ranges include 40 ~ 150, 50 ~ 150, 60 ~ 150, 70 ~ 150, and 80 ~ 150 depending on the configuration.
• Full length alteration (LC) and tip alteration (PC): use LC (25 ~ 149.9 mm) and PC (1.25 ~ 17.5 mm) to position the locating and tip engagement without changing the overall shank length.

Because dowel-hole positioning depends on the chosen stepped geometry, confirm the configuration’s LC/PC values against your core insert and guide plate stack-up.