SKH51 Steel TiCN Coating Ejector Punches for Heavy Load with Dowel Holes

These SKH51-based ejector punches with a TiCN surface are used in injection mold tooling where repeated ejection and trimming loads demand consistent guidance and extended wear life. The single-stepped shank and dowel locating hole improve alignment in die sets, reducing lateral movement during impact.

• Automotive and appliance housings: In heavy-duty cavity ejector systems, the TiCN (XCN) coating helps resist abrasion from molded flash and particulate contamination, supporting longer service intervals.
• Precision connector and insert molding: For center punching and ejector positioning, the locator dowel hole stabilizes the punch path to improve dimensional repeatability across cycles.
• High-cycle trimming and forming stations: The available standard and spring/pin reinforced variants help maintain retention under repeated impacts, protecting fit integrity between the punch and related components.

Select the round/rectangle/oblong tip geometries when your cavity/core land requires consistent material removal while maintaining a guided ejection motion.

Steel grade: SKH51 is a high-speed tool steel (commonly aligned with the HSS family; AISI M2-equivalent behavior is typical for SKH51-grade applications). Its high hot hardness and wear resistance make it suitable for ejector punches subjected to frequent contact and sliding during ejection.

• Coating: TiCN (XCN) coating provides enhanced surface hardness and abrasion resistance, improving wear life in dirty or flash-prone molding environments.
• Heat treatment: While exact hardness is not provided in the specification, this class of HSS punches is typically manufactured to a hardened and tempered state to balance hardness (often in the HRC ~60 range for HSS punches) with sufficient toughness.
• Trade-offs: Higher hardness increases wear resistance but can reduce toughness if over-tempered/over-hardened; tempered optimization is important for impact durability.

Compared with uncoated steel punches, TiCN-coated variants generally reduce surface wear rate and help maintain dimensional stability over higher cycle counts.

To select the correct ejector punch, match the shank diameter D and overall length L / LC to your mold’s guide and mounting requirements. Available D sizes are 10, 13, 16, 20, and 25 mm, which should correspond to your die set bore or receiver dimensions.

• Tip-to-contact geometry: Choose tip shape (Round, Rectangle, Oblong, Double flatted round, Radius rectangle) and then set P (tip dimension) in the range 5 ~ 18 mm. For corner radius, select R matching the required edge condition (ranges depend on the variant; values span 0.15 ~ 12.48 mm).
• Length matching: Use L options such as 60–130, 70–130, 60–100, or 70–100 mm. Confirm full length alteration LC availability (e.g., 53–129.9, 54–129.9, 53–99.9, 54–99.9), ensuring enough stroke margin for ejection travel.
• Retention variant: Decide between standard and spring and pin reinforced based on expected impact frequency and retention requirements.

If your mold uses tight guide clearance, verify the press-fit/clearance target for the selected D before ordering; the tolerance values are not specified here, so confirm with your receiving component drawings.