JIS Standard M2 Steel Gas Release Rectangular Ejector Pins

This gas-release rectangular ejector pin variant is used in injection mold tooling where stable ejection and consistent exhaust are required. The built-in gas vent supports efficient venting at the pin tip area, helping reduce trapped air and improving part-to-ejector repeatability during high-cycle production.

• Automotive connector and small housing molds: Rectangular guidance helps maintain consistent positioning under repeated cycle loads, while the vented design promotes reliable exhaust for fine-feature releases.
• Appliance and consumer electronics casings: For molds with multiple ejection points, the gas vent helps stabilize ejection accuracy by minimizing pressure buildup around the ejector interface.
• General industrial plastic components: JIS-standard manufacturing supports compatibility with typical tooling layouts and reduces integration effort when pairing with standard ejector systems.

Its M2 steel construction further suits long production runs where ejector wear and dimensional stability are critical.

This ejector pin series is made from JIS Standard M2 tool steel. M2 corresponds closely to the AISI M2 family, commonly selected for balanced hardness and wear resistance in cutting and forming-related tools, and also for durable ejector components.

• Heat treatment (typical for M2 ejector usage): quench-and-temper to achieve a hard working surface suitable for sliding contacts and repeated ejection loads.
• Hardness & performance trade-off: M2 is chosen to provide high wear resistance; increasing hardness improves tip wear life but can reduce toughness if over-hardened.
• Manufacturing approach: bar stock machining into rectangular geometry, followed by heat treatment to develop the required surface hardness.

If you need higher toughness at the expense of some wear resistance, alternative tool steels may be considered, but this series is specifically aligned with M2’s wear-focused properties.

Select dimensions by matching the ejector pin’s shaft and guided tip geometry to the mold’s ejector plate openings and the cavity/core contact requirements. Start with D (shaft diameter) = 1.5 ~ 15 mm and ensure the opening/fit in the ejector system matches the required guidance and return stability.

• Tip geometry: Choose P (tip) = 1 ~ 3.5 mm and W (tip) = 1 ~ 1 mm to achieve the intended tip contact area and vent effectiveness.
• Length: Use L = 40 ~ 250 / 40 ~ 300 / 50 ~ 300 / 40 ~ 350 / 50 ~ 350 mm to span from the ejector plate to the cavity side without excessive unsupported length.
• Head thickness: Verify T4 or JIS head thickness options = 4 mm (T4), 4/6/8 mm (JIS) to align with ejector plate and spacer stack-up.
• Dimension N: Confirm N = 23 ~ 40 mm for correct step positioning and assembly height.

For controlled assembly and tip seating, reference the provided tolerance guidance of 0/-0.01 where applicable to your pin-to-mold interface.