Pipette Tip Core Pin for High-Cavitation Medical Injection Moulds

Product Overview

The Pipette Tip Core Pin is a precision conical core component used in injection moulds for disposable laboratory consumables.

It forms the internal cavity of pipette tips and ensures accurate taper geometry, smooth surface finish, and dimensional stability across high-cavitation mould systems.

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

Product Description

This conical core pin is designed for moulds producing disposable pipette tips and other thin-wall medical components.

The part features:

• Long precision taper

• High straightness shaft

• Stable positioning base

• Heat-treated tool steel structure

During injection moulding, molten plastic flows around the core pin to form the outer shape of the pipette tip. Any deviation in taper, straightness, or surface finish may directly affect sealing performance and dosing accuracy.

In multi-cavity moulds (8, 16, 32, 64, 96 cavities and above), core pins must maintain strict dimensional consistency to ensure identical product performance across all cavities.

Applications

Laboratory Consumables

• Disposable pipette tips

• Filter pipette tips

• Automated liquid handling tips

Medical Plastic Components

• Thin-wall diagnostic parts

• Precision laboratory tubes

• Micro medical containers

High-Cavitation Mould Systems

• Multi-cavity medical moulds

• High-speed injection production lines

Precision & Manufacturing Capabilities

We focus on geometric accuracy, surface quality, and batch consistency.

Typical control capability:

• Taper accuracy: controlled per drawing tolerance

• Straightness: ≤ 0.005–0.01 mm

• Concentricity: ≤ 0.005–0.01 mm

• Surface finish: Ra ≤ 0.1–0.3 μm (working area)

• Hardness: customised according to mould life requirement

The manufacturing process includes:

• Precision CNC turning

• Fine taper grinding

• Cylindrical grinding

• Controlled heat treatment

• Full inspection using CMM

• Matched batch production for high-cavitation moulds

Each batch is inspected and documented to maintain dimensional stability over long-term supply.

Dimensional Stability for Medical Accuracy

In medical and laboratory applications, part performance depends directly on core pin accuracy.

If the core pin has:

• Slight taper variation

• Surface roughness deviation

• Straightness error

It may result in:

• Poor sealing with the pipette

• Inaccurate liquid dosing

• Part deformation

• Higher rejection rate

By maintaining tight geometric control and stable production processes, we help customers achieve:

• Reliable sealing performance

• Consistent dosing accuracy

• Reduced mould maintenance

• Long service life in high-volume production

For medical mould makers, stability and repeatability are more important than speed alone.

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 core pins are manufactured according to customer drawings.

Q2: What materials are commonly used?
Common tool steels include H13 (1.2344), S136, and other grades depending on wear resistance and production volume.

Q3: Can you ensure consistency across high-cavity moulds?
Yes. Core pins are produced and inspected as matched sets for multi-cavity systems.

Medical Application Questions

Q4: How do you control taper accuracy?
We use precision taper grinding and CMM inspection to verify geometry against drawing requirements.

Q5: Can you meet high surface finish requirements?
Yes. Surface finish in the working area can reach Ra 0.1–0.3 μm depending on the specification.

Q6: Do you support long-term repeat orders?
Yes. We maintain dimensional records to ensure repeatability in future batches.

Contact Us

Send us your drawings for technical review. We will evaluate geometry, tolerances, and production feasibility.