HW Coating Tapered Head Ejector Punches

Tapered-head ejector punches are used inside injection mold tooling where stable, repeatable ejection force is required under high duty cycles. The HW-coated wear surface helps resist abrasion and micro-galling during repeated core/core-housing clearing, while the tapered-head mounting supports consistent alignment.

• Automotive and industrial housings: In molds with deep ribs or thick-wall parts, these punches help drive ejector plates and lift cores evenly, reducing sticking and maintaining consistent part release.
• Press and transfer tooling: For heavy-load die work, the secure tapered-head fit improves force transfer from the ejector system to the punch tip, supporting reliable ejection over production runs.
• Appliance/consumer product molds: When ejecting features that are prone to scuffing, the HW coating improves tool surface durability on the punch contact region.

The single-stepped shank design and the tapered-head mounting are especially suited to applications where alignment stability is critical for long service life.

This ejector punch series uses powdered high-speed steel, with SKH51 equivalent as the specified material. SKH51 is commonly referenced as an AISI M2-equivalent high-speed steel grade, chosen for a balance of hot hardness and wear resistance.

The HW coating is applied to improve surface durability under heavy contact and sliding during ejection cycles. In practice, this coating increases resistance to abrasive wear, helping maintain a stable punch geometry and reduce galling risk.

• Hardness (typical expectation): SKH51/M2-class steels are generally used in hardened conditions around the ~60 HRC range for tooling performance; exact HRC depends on the supplier’s heat treatment recipe.
• Toughness trade-off: Higher hardness improves wear resistance but can reduce impact toughness; proper heat treatment and coating selection help manage this balance.

Compared with lower-alloy steels, SKH51-class high-speed steel offers stronger wear performance for long-running mold cycles, particularly when paired with a wear-resistant coating.

To select the correct tapered head ejector punch, start from the required punch shank diameter D and the cavity/core clearance envelope. Available D values are 8, 10, 13, 16, 20, 25 mm, and choosing the correct D helps ensure proper guidance through the ejector plate and consistent alignment during ejection.

Next, match the tip geometry to the part-eject interface using the provided B (tip length) options: L and S. Then select the P (tip dimension) range corresponding to your available contact window; P is offered in six ranges: 3–7.99, 3–9.99, 6–12.99, 10–15.99, 13–19.99, and 18–24.99 mm.

• Set the overall length using fixed L = 60–100 mm.
• Adjust full-length alteration with LC = 37–99.9 mm and choose a PC (tip alteration) of 1.5–2.99, 3–5.99, 5–9.99, 6.5–12.99, or 9–17.99 mm.

Use the defined alteration parameters (LC/PC) to align the punch tip height with the mold’s core/gate removal position; ensure engineered clearances and fit are maintained for stable tapered-head seating.