Precision Sprue Bushing / Hot Runner Nozzle Seat for Injection Moulds

Product Overview

The Precision Sprue Bushing, also known as a Hot Runner Nozzle Seat, is a key structural component used in injection mould systems.

It connects the injection machine nozzle or hot runner nozzle to the mould and ensures accurate alignment, proper sealing, and stable melt flow during production.

All components are manufactured strictly on a built-to-print / OEM basis, according to customer drawings and mould design requirements.

Product Description

This component is designed to guide and support the molten plastic flow from the injection machine or hot runner system into the mould cavity.

Typical structural features include:

• Precision-machined inner bore

• Concentric outer locating steps

• Flange base for stable positioning

• Hardened tool steel body

Depending on the mould structure, it may function as:

• A sprue bushing in cold runner moulds

• A nozzle seat in hot runner mould systems

• A central locating bushing in high-cavitation moulds

Proper alignment between the injection nozzle and mould is critical. Even small deviations can cause leakage, wear, or unstable filling.

Applications

Packaging Moulds

• Bottle cap moulds

• Thin-wall container moulds

• High-speed multi-cavity packaging moulds

Medical & Laboratory Moulds

• Medical consumable moulds

• High-precision diagnostic component moulds

• Cleanroom production mould systems

General Injection Moulds

• Cold runner systems

• Hot runner systems

• Multi-cavity production moulds

Precision & Manufacturing Capabilities

We focus on dimensional accuracy and structural stability to ensure long-term mould performance.

Typical control capability:

• Concentricity: ≤ 0.005–0.01 mm

• Bore accuracy: controlled per drawing tolerance

• Surface finish (bore area): Ra ≤ 0.4 μm

• Hardness: customised according to application

• Heat treatment control for wear resistance

The manufacturing process includes:

• CNC turning and milling

• Precision boring

• Cylindrical grinding

• Controlled heat treatment

• CMM full inspection

• Batch consistency control

Each part is inspected to ensure alignment accuracy and repeatable installation performance.

Stable Alignment & Melt Sealing Performance

In injection mould systems, alignment between the machine nozzle and mould entrance is critical.

If the sprue bushing or nozzle seat has:

• Concentricity deviation

• Bore misalignment

• Surface finish issues

It may lead to:

• Melt leakage

• Excessive wear

• Flash formation

• Unstable filling

• Increased maintenance frequency

By maintaining tight geometric control and material stability, we help customers achieve:

• Reliable sealing performance

• Stable melt flow

• Reduced downtime

• Longer mould service life

For high-speed packaging and medical moulds, structural stability directly affects production efficiency.

What We Need for Quotation

To provide an accurate quotation, please share:

1. 2D drawing (PDF format)

2. 3D model (STEP or IGES preferred)

3. Material specification

4. Hardness requirement

5. Surface treatment requirement (if any)

6. Order quantity

Complete technical information allows us to provide a precise evaluation and lead time.

FAQ

General Questions

Q1: Do you provide standard sizes?
No. All parts are manufactured strictly according to customer drawings.

Q2: What materials are commonly used?
Common materials include H13 (1.2344), P20, S136, and other tool steels depending on temperature and wear requirements.

Q3: Can you ensure dimensional repeatability for repeat orders?
Yes. We maintain dimensional records and inspection reports to ensure batch-to-batch consistency.

Hot Runner / Packaging Application Questions

Q4: Can this part be matched with specific hot runner brands?
Yes. We manufacture according to your hot runner system dimensions and installation requirements.

Q5: Is it suitable for high-cavitation moulds?
Yes. We control concentricity and bore accuracy to ensure stable performance in multi-cavity mould systems.

Contact Us 

If you are sourcing a reliable supplier for sprue bushings or hot runner nozzle seats, please send us your drawings and quantity information.

Our team will provide:

• Clear technical evaluation

• Competitive pricing

• Confirmed lead time

• Stable long-term supply support

We focus on precision, repeatability, and reliable delivery for packaging and medical mould applications.