RP Coating Tapered Head Ejector Punches

Tapered head ejector punches with an Al-Cr RP coating are commonly used in injection mold tooling where consistent ejection under heat and cyclic wear is critical. They suit automotive connector and sensor housing molds that run in high volume and eject parts with textured or mildly abrasive surfaces, helping stabilize punching performance during long production cycles.

• High-heat ejection zones: the RP Al-Cr high-hardness, heat-resistant coating supports wear control when molding compounds raise tool surface temperatures.
• Wear-prone cavity inserts: Alpha treatment improves coating adhesion, reducing film breakdown on tapered head contact areas.
• Maintenance-sensitive production: extended punch life and reduced servicing intervals can be advantageous in tight-changeover manufacturing lines.

Use this variant when you need reliable wear performance on tapered head features while maintaining stable ejection behavior across repeated cycles.

This product is made from a powdered high-speed steel with an equivalent to SKH51 (powder metallurgy HSS family). It is paired with an Al-Cr-based RP coating to raise surface hardness and improve heat resistance at the punch working region.

• Coating system: Al-Cr high-hardness, heat-resistant film for improved wear performance.
• Alpha treatment: promotes stronger coating adhesion and helps maintain the coating’s integrity under sliding/impact contact.
• Trade-off: relative to uncoated punches, the coating targets wear and temperature stability, while the underlying HSS provides the toughness needed for repeated ejector action.

Heat treatment details such as quench-and-temper temperature or final HRC are not provided in the given data; selection is typically aligned with SKH51-equivalent HSS practice and the stated coating/adhesion treatments.

Select dimensions by matching the tapered head geometry to the ejector stroke space and contact envelope in the mold cavity/core. This series provides multiple shank diameter options: D = 8, 10, 13, 16 mm.

• Tip length (B): choose from the available L and S tip-length options (as specified for this series) to fit the required engagement depth.
• Tip dimension (P): select within the available ranges: 4–7.99, 5–9.99, 6–12.99, or 10–15.99 mm, based on the taper footprint needed for uniform part release.
• L (overall length): available in multiple ranges including 60–80, 60–90, 70–100, 50–80, 55–90, and 65–100 mm to cover the required ejector travel and guide clearance.

Coating thickness and fit tolerance behavior are not stated; therefore, verify clearance in the ejector block/guide and confirm that the chosen D provides the intended sliding fit. Prefer fixed, specified dimensions for cavity/core compatibility; confirm that the selected P and B avoid interference with nearby features.