Bolt Fixing Sprue Bushings - Flange Thickness 10 mm

Bolt fixing sprue bushings are installed at the mold’s sprue-to-nozzle interface to create a rigid, repeatable positional reference during injection cycles. This 10 mm flange thickness variant is well suited for press-fit or bolt-stabilized nozzle mounting where consistent alignment reduces shear at the resin entry and helps maintain sprue formation.

• Automotive and appliance connector molds: Use the bolt-fixing interface with a resin pocket nozzle touch to keep the sprue channel concentric under repeated thermal expansion.
• General-purpose industrial housings: The available straight and tapered tip matching shapes support compatibility with common nozzle geometries, helping achieve stable sprue connection across varying taper requirements.
• High-throughput sprue handling setups: The fixed sprue diameter range (2–3 mm) and resin pocket depth (0.3–2 mm) support controlled melt feeding and consistent runner-to-cavity transfer.

Because the flange provides a stable mounting plane, this product helps reduce misalignment-driven defects such as flash or incomplete sprue merging.

This sprue bushing variant is offered in SKD61 and HPM1 (equivalent), tool steels commonly selected for their combination of hot strength and dimensional stability under repeated molding conditions. For SKD61/HPM1-class steels, hardness is typically targeted in the HRC range around the upper 40s to low/mid 50s after quench and temper (Q&T), balancing wear resistance with toughness.

• SKD61 / HPM1 equivalent: Good resistance to sprue-side wear and heat checking; preferred when durability at elevated temperatures is required.
• Trade-offs: Increasing hardness improves wear resistance but can reduce toughness; maintaining Q&T practice helps manage chipping risk at the resin-pocket and taper surfaces.
• Manufacturing/finishing: Common practice is precision turning/boring for the bearing bore and tip features, followed by Q&T to the specified hardness, then final inspection to ensure nozzle-pocket geometry compatibility.

Actual hardness and heat-treatment targets should be confirmed against the supplier’s lot certificate for your specific SKD61 or HPM1 batch.

To select the correct bolt fixing sprue bushing dimensions, match the shaft diameter (D), bearing bore length (L), and tip features to the nozzle and front-end sprue assembly geometry in your mold.

• Shaft diameter (D): Choose from 8, 10, 12, 13, 16, 20 mm based on the nozzle guide or mounting bore requirements.
• Bearing bore length (L): Select within the available ranges: 0–80, 0–120, 0–150, or 0–200 mm to achieve the required engagement length and support stability.
• Sprue and resin pocket interface: Confirm P (sprue diameter) = 2–3 mm and F (resin pocket depth) = 0.3–2 mm to control melt entry and prevent over/under-engagement.
• Nozzle taper compatibility: Set A (taper angle at sprue) = 0.5–3° (up to 0.5–4°) and G (taper angle) = 1–10°. Choose tip matching shape as straight or tapered, and select V (tip diameter) = 4–10, 4–13, 4–16, or 4–20 mm to suit your nozzle tip.

Use your nozzle’s measured contact/taper geometry as the primary reference; then verify the sprue diameter (2–3 mm) and pocket depth (0.3–2 mm) to ensure proper resin merging. Tight-fit features typically require attention to molding assembly tolerances to maintain concentricity.