SKH51 Steel Gas Release Straight Ejector Core Pins Flat-Sided

These SKH51 gas-release straight ejector core pins are used in injection mold tooling where controlled ejection and improved venting are critical. The straight ejector configuration benefits molds that require stable center pin location during each shot, reducing the risk of positional drift in multi-cavity layouts.

• Automotive connector and housing molds: Flat-sided heads help prevent rotation during assembly and operation, supporting consistent alignment of the ejector core. The internal gas-release design supports better mold exhaust around the core features, which can help limit burn marks and short shots.
• Electronics and thin-wall parts: When gases trapped near the ejector area must be vented, the gas-release structure supports reliable ejection performance across high-cycle production.
• General straight ejector arrangements: The one-step center pin set concept supports accurate mold alignment, making this variant suitable for repeatable ejection positioning with tight shaft/diameter-related tolerances.

SKH51 steel is selected for gas-release ejector core pins because it is engineered for high wear resistance under repeated sliding/impact contact in mold cycles. In common mold steel equivalency terms, SKH51 is comparable to AISI M2.

• Heat treatment: The design is based on quench-hardened construction, targeting a durable working hardness for core-pin service.
• Hardness & performance trade-off: Quench hardening improves wear resistance, which is essential for straight ejector cores exposed to frequent ejection friction and localized stresses. Increased hardness can reduce toughness compared with softer annealed conditions, so proper sizing and alignment are important to avoid chipping under misload.
• Manufacturing process: Produced as straight ejector core pins with controlled shaft and hole geometries, then hardened and finished to meet the specified diameter and recess features.

If alternative steels are used in the same category, higher-toughness grades can reduce chipping risk, while SKH51 emphasizes wear life for long production runs.

To select the correct dimensions, match the pin shaft and vent hole features to the mold’s core/core-box layout and the ejector alignment requirements. Use the provided ranges for D/P (shaft diameter) and V (hole diameter) to ensure the pin fits the corresponding bore and maintains stable guidance.

• Shaft diameter (D/P): Select from 4–14 mm based on the mold’s drilled or ground guidance and ejector alignment bushings.
• Hole diameter (V): Choose 1–7 mm to correspond with the gas-release/venting feature geometry in your core design.
• Length (L) and full length (X): Use L = 50–120 / 50–150 / 50–200 mm for the center pin dimension you reference in your drawing, and confirm total X = 70–220 / 70–250 mm for clearance to the mold face and ejector stroke envelope.
• Tip/recess geometry: Select center tip shape A/B/C/D/E/S, center tip diameter A/E = 0.5–2 mm, and recess diameter C = 0.1–1 / 0.1–1.5 mm to match mating core recess profiles.
• Tolerance & fit: Flat-sided, one-step center pin sets are intended for stable placement; ensure your guidance bore/inner diameter tolerances are consistent with the pin’s shaft and hole sizes to prevent rotation or misalignment.