JIS Standard SKH51 Steel Gas Release Core Pins (GVFCA)

This gas release core pin variant is used in injection mold tooling where stable venting directly affects part surface quality and cycle-to-cycle consistency. In automotive connector and housing molds, tip-machining friendly geometry helps maintain controlled exhaust at the core end, supporting cleaner flow and reducing risk of air entrapment marks.

For consumer electronics and small precision housings, the integrated gas vent filter supports a more consistent exhaust path during high repeat production, which is particularly valuable when fine gate/vent designs require dependable localized venting at the core tip.

In medical device component molds, where surface appearance and uniformity are critical, medium-to-high flow rate configurations can be selected to match the vent demand while retaining the core pin’s locating role for repeatable assembly.

• Tip machining compatibility enables controlled end preparation for targeted venting.
• Built-in gas vent filter improves exhaust stability to help produce cleaner filling and reduced defects.

The core pins are made from JIS Standard SKH51 high-speed steel, selected for its balance of wear resistance and toughness under repeated molding loads. This grade is commonly used where cutting/tip-machining and long service life are required at the tool steel surface.

After machining, the pins are typically hardened and tempered to achieve a functional hardness level suitable for core pin wear and venting contact conditions. Because exact hardness and heat-treatment parameters are not provided here, final qualification should be confirmed against your internal tooling standard.

• Wear-focused hardening: improves edge durability at the vented tip and reduces dimensional drift over cycles.
• Toughness trade-off: higher hardness can increase brittleness; proper tempering is necessary to maintain impact resistance during handling and mounting.
• Material comparison: compared with lower-alloy tool steels, SKH51 generally supports higher wear resistance for demanding core applications, while still being machinable for tip machining.

Select the pin using the specified D/P (shaft diameter) (mm) and the fixed L (length) (mm) = 15 to 100. Choose D/P based on the core support and the corresponding bore/core hole size in your mold base; the pin must provide sufficient contact area for stable locating without excessive clearance.

To match cavity/core requirements, align the L so the vented end reaches the intended proximity to the cavity shutoff region after assembly. If tip machining is planned, start with the provided stock length range and account for the amount removed during end preparation.

• D/P options: 3, 4, 5, 6 mm.
• L range: 15–100 mm (fixed series length selection).
• Flow rate selection: pick Medium or High Flow Rate based on expected vent demand to avoid under- or over-venting.

Confirm tolerance/fit with your mold drawing standards: maintain a fit that prevents wobble and misalignment while still allowing reliable assembly and thermal expansion compatibility.