SKH51 Steel Pin-Point Gate Bushings with Head

This pin-point gate bushing is used in injection molds where a stable angle-gate transition is required, helping create consistent gate openings from sprue to runner to cavity. The tapered pilot/tip supports controlled gate formation, which reduces variability across molding cycles and improves repeatability in high-volume production.

• Automotive and appliance connector molds: Ideal for thin-gauge gates or narrow landing zones where a precise transition is needed; the hardened SKH51 cutting surfaces maintain dimensional stability during long runs.
• Industrial housings with angled gates: The fixed secondary sprue angle range (A = 1–3°) combined with selectable tip shapes supports consistent gate initiation, improving filling and reducing gate-related defects.
• Medical or electronics micro-gating applications: Use the smaller tip diameter options (P up to 0.3–1.2 mm depending on variant) to match small gate geometries while relying on the head’s positive positioning for repeatable press performance.

Its variant flexibility (tip shape, cutting angles, and tip geometry) makes it well-suited for tuning gate sensitivity to specific part and gating designs.

SKH51 steel is a high-speed steel grade commonly used for tooling requiring durable cutting/wearing edges. For this application, the key property is wear resistance at the bushing’s tapered tip and cutting surfaces, supporting stable gate forming over extended production.

• Expected performance balance: High hardness provides abrasion resistance, but increased hardness can reduce toughness compared with lower-alloy wear steels.
• Heat treatment state: Designed as a hardened cutting-surface bushing; exact hardness/tempering values are variant- or supplier-controlled and should be confirmed to match your mold qualification plan.
• If you compare alternatives (e.g., less wear-focused tool steels), you typically gain toughness but may lose long-run edge life at the pin-point transition.

When selecting for abrasive sprue/runners and repeated gate forming cycles, SKH51’s wear-focused performance is the primary material reason to choose this variant family.

Select the bushing geometry by matching the gate transition requirements and the mold’s sprue/runner layout. Start with D (outer diameter) to ensure proper fit in the sprue bushing bore; available D = 2.5–10 mm with a specified tolerance of 0/−0.005 for stable assembly alignment.

• Match the angle transition: Use the fixed A (secondary sprue angle) = 1–3° and choose the appropriate K (cutting angle) = 20–30°, 20–40°, or 20–60° depending on your angle-gate design.
• Match gate size: Select P (tip diameter) = 0.3–1.2 mm and V (tip diameter) = 1.5–5 mm to fit the target pin-point gate diameter/lead-in.
• Match engagement depth: Choose C (tip length) (0.2–0.5, 0.3–0.8, or 0.5–1.5 mm) and the L dimension (10–25, 20–40, or 20–60 mm) to achieve the required pilot reach.

For assembly, confirm that the mold bore dimensions accommodate the D tolerance (0 to −0.005 mm) and prevent loose positioning that could affect gate repeatability.