Key Flat Shank Ejector Punches - RW Coating

These keyed flat shank ejector punches are used in injection mold tooling where the punch must stay aligned while transferring heavy ejection force. The single-stepped shank geometry helps maintain stable guidance under load, reducing misalignment-related wear.

• Automotive connector and sensor housing molds: Ideal for ejector systems that require repeatable stroke behavior and consistent tip engagement with keyed cavities.
• Appliance and industrial part molds: The spring-reinforced ejector pin option supports reliable ejection and helps recover after load cycling, improving robustness during high-run production.
• General heavy-load molding: RW-coated high-speed steel construction is suited for applications that demand improved wear resistance at the punch tip and shank guidance area.

Choose the spring-reinforced ejector mechanism variant when high ejection loads and frequent cycling can otherwise lead to inconsistent return or accelerated wear.

This punch uses a SKH40-equivalent powdered high-speed steel base (as described for this series) combined with an RW coating. High-speed steels are selected for their combination of wear resistance and hot-strength behavior in sliding contact zones typical of ejector tools.

• Heat treatment state: The product description specifies SKH40-equivalent powdered HSS, consistent with tool-steel processing for wear service; the exact target hardness (HRC) and detailed heat-treatment parameters are not provided in the available data.
• Wear resistance vs. toughness: HSS offers strong wear resistance for punch tips and guidance faces, while requiring attention to impact loads where toughness could be lower than tougher tool steels.
• Coating role: RW coating is intended to further improve surface durability and reduce scuffing/abrasion during repeated ejection.

If you compare material options across suppliers, HSS + RW is typically chosen over lower-cost steels when service life at the tip and guidance surfaces is a priority.

To select the correct keyed flat shank ejector punch, match the shank diameter D (4 ~ 25 mm) and the required tip geometry to your ejector hole and cavity contact profile. Confirm the tip dimension P (1 ~ 18 mm) and the configured tip length category (B: L or S).

• Tip shape selection: Choose from Round, Rectangle, Oblong, Double Flatted Round, Radius Rectangle to match your part ejection footprint.
• Length matching: Select the L (L dimension) range appropriate to your stack-up, with options including 50 ~ 80, 50 ~ 100, 60 ~ 100, 40 ~ 80, 40 ~ 100 mm.
• Total length adjustment: Use LC (27 ~ 90.1 mm) and associated head thickness tolerance change ranges LCT/LMT (27 ~ 90.1 mm) based on how your drawing accommodates tolerance compensation.

For fit, ensure D aligns with the ejector bore while accounting for your system’s machining allowances; exact tolerance values are not provided, so validate critical fits via your mold drawing standards.