Gas Release Round Core Pins Flat-Sided

Core boss-inlay alignment and venting are typical needs in multi-part injection molds where the boss geometry must stay concentric across repeated cycles. This flat-sided anti-rotation core pin variant uses the gas vent feature to promote consistent exhaust, reducing trapped gas risks and helping maintain stable cavity pressure during filling.

In automotive connector and housing molds, the flat-sided head prevents unwanted rotation during assembly, which improves boss position accuracy for mating components. The hardened steel construction supports wear under continuous movement between cycles.

For electronics and small appliance housings, accurate inlay alignment is critical to avoid downstream fit issues. The available shaft diameter range supports tight hole-to-boss interfaces, while the built-in gas release supports smoother venting in fine-gauge details.

• Gas exhaust support: built-in venting reduces trapped air effects.
• Anti-rotation positioning: flat-sided head maintains boss alignment.
• Stable wear performance: hardened steel supports repeat molding.

This core pin family is offered in SKD61 or SKH51 steels, both chosen for injection mold tooling durability. SKD61 is widely used as an H13-equivalent hot-work tool steel, providing a good balance of toughness and tempering stability for cores that see heating and repeated cycles. SKH51 corresponds to an AISI M2-equivalent high-speed steel, generally prioritizing wear resistance where sliding contact or abrasion is a concern.

• Heat treatment state: hardened steel construction is used for stable positioning and wear performance under repeated operation.
• Hardness & trade-offs: both options are intended for wear resistance; SKH51 typically offers higher wear performance, while SKD61 is often selected where toughness and thermal stability matter more.
• Manufacturing process: precision machining for shaft and flat-sided anti-rotation features, followed by hardening and tempering appropriate to the selected grade.

Note: exact HRC values are not provided in the available specification data.

To select the correct core pin dimensions, match the D/P (shaft diameter) to the boss-inlay hole size in your core block. The available D/P range is 1.5 to 8 mm, with shaft diameter tolerances of -0.01/-0.02 or 0/-0.005 depending on the part/option.

Next, verify the hole geometry in the mold design using the provided hole shape codes (BL, BS, CG, CQ, CS, RG, RQ, RS, SG, SQ, SS). The hole diameter A is specified as 1 to 1 mm (fixed range in the data), while hole depth B is available in 0.3–3 mm, 0.5–3 mm, or 0–3 mm.

• L length: choose 10–100 mm or 10–120 mm based on core thickness and support length needs.
• Chamfering: chamfer widths are fixed as C: 0.2–0.5 mm and G: 0.25–1 mm, which should align with your hole entry relief.
• Hole tolerance: hole tolerance is 0/-0.04, 0/-0.02, or 0/-0.01; use this to confirm fit (slip vs. press) between hole and pin.

Also confirm SR (hole spherical surface radius, 0.5–6.4 mm) and the end features (Q and R) to ensure proper seating of the gas-release/inlay interface.