M2 Steel Gas Release Core Pins with Vent Filter

Used in straight core pin assemblies for plastic injection molds, this gas-release variant integrates a pressed vent filter at the pin tip to route trapped air out through built-in ventilation grooves. The concentric groove geometry helps exhaust gas uniformly regardless of installation orientation, supporting stable cavity pressure during filling.

• Automotive connector and housing molds: improves venting consistency in dense part geometries where knit lines, burn marks, or short shots can be triggered by trapped air near core surfaces.
• Appliance and enclosure components: supports repeatable mold filling for deeper ribs/feature cores by maintaining controlled air evacuation along the core pin region.
• General core-based venting inserts: suited when you need a compact gas path at the core interface without relocating external venting to the parting line.

The M2-steel, quenched hardened construction is appropriate for core pin duty where abrasion and long-term wear at the pin tip/vent interface affect vent performance.

This core pin uses M2 tool steel in the quenched hardened condition for core wear resistance under repeated sliding/press-fit assembly and high-contact mold operation. M2 is widely associated with AISI M2 (high-speed steel family) chemistry, providing strong hot hardness and improved durability at the pin tip compared with lower alloy steels.

• Heat treatment: supplied in a quenched hardening steel state (hardness oriented for tool steels used in die and insert applications).
• Hardness & wear vs. toughness trade-off: quenched hard structures typically deliver higher wear resistance but require attention to shock loading; excessive impact can reduce toughness.
• Manufacturing: machined straight core pin blanks with tip grooving, followed by heat treatment, then functional finishing so the press-fit vent filter seats reliably at the pin end.

If you compare alternatives, lower-alloy core pin steels may be tougher but generally offer less wear resistance at the vent/filter interface, which can impact repeat vent consistency over cycles.

Select the shaft diameter (D/P) to match the intended drilled bore size in the mold block and the core pin retention design. Available diameters are 3, 4, 5, and 6 mm, so choose the closest match to your core support hole and guide layout.

• Step 1 — Choose D/P: use D/P = 3–6 mm based on your core pin seat diameter and press-fit guidance. Verify that the bore and seating design are compatible with a press-fit at the pin tip where the vent filter is integrated.
• Step 2 — Choose L: set the overall length to your stack-up needs using L = 15 to 100 mm. Ensure the vent/filter region lands in the airflow path zone near the cavity interface.
• Step 3 — Fit and tolerance: press-fit interfaces require attention to manufacturing tolerances for concentricity and seating depth. If you must maintain a specific vent-to-cavity clearance, confirm that the selected L does not shift the vent grooves relative to the intended exhaust location.

D/P and L are fixed by the specification range; select among available sizes to achieve the required placement.