High Precision HSS Syringe Mold Core

TiN Coated Core Pins for Laboratory Pipette Tip Injection Molding

Product Overview

Our High Precision HSS Syringe Mold Core with TiN coating is specifically engineered for laboratory pipette tip and medical injection molding applications.

These mold cores are designed for:

• Thin-wall pipette tip molds

• Multi-cavity syringe molds

• High-speed medical plastic production

• Precision laboratory consumables

Manufactured from high-speed steel (HSS) and finished with controlled TiN coating, the core pins provide dimensional stability, wear resistance, and consistent demolding performance in high-cycle environments.

All components are produced strictly according to customer drawings.

Application Areas

This mold core solution is widely used in:

• Laboratory pipette tip molds

• Disposable syringe molds

• Medical consumables injection molds

• Diagnostic plastic components

• Cleanroom production tooling

These applications require micron-level precision and repeatable multi-cavity performance.

Material & Coating Logic

High-Speed Steel (HSS)

HSS provides:

• High hardness after heat treatment

• Good resistance to edge wear

• Dimensional stability in small-diameter cores

• Reduced deformation risk during long production runs

Typical hardness range:
60–62 HRC (adjustable depending on project requirements)

TiN Coating (Titanium Nitride)

TiN coating enhances:

• Surface hardness

• Wear resistance

• Reduced friction during ejection

• Improved resistance to resin adhesion

In pipette tip molds, TiN helps maintain consistent surface quality and reduces maintenance frequency.

Engineering Focus

Pipette tip cores are long, slender, and highly precise.
Performance depends on:

• Concentricity

• Taper accuracy

• Surface finish

• Thermal stability

1) Dimensional Precision

• Diameter tolerance: ±0.01 mm (tighter tolerance available upon request)

• Axiality: ≤ 0.005 mm

• Verticality: ≤ 0.005 mm

• Surface finish: Ra 0.6 or finer

Accurate geometry ensures proper tip wall thickness and uniform flow during injection.

2) Surface Finish & Polish

Core surface polishing supports:

• Smooth demolding

• Stable resin flow

• Reduced surface defects

Mirror or fine polishing can be applied based on project requirements.

3) Multi-Cavity Alignment

In high-cavity medical molds:

• Cores must maintain identical dimensions

• Alignment between cavity and core must be precise

• Taper and length consistency are critical

Simultaneous machining and controlled grinding processes ensure uniformity across cavities.

Manufacturing Capability

Processing includes:

• High-speed CNC machining

• Precision cylindrical grinding

• Wire EDM for detailed features

• Surface grinding and polishing

• TiN PVD coating application

• CMM dimensional inspection

Critical features are ground after heat treatment to ensure dimensional stability.

Typical Plastic Materials Processed

Common materials for syringe and pipette tips include:

• PP

• PE

• PC

• Medical-grade thermoplastics

Mold core design is optimized based on resin shrinkage and flow characteristics.

Quality Control

Each mold core undergoes:

• Material verification

• Hardness testing

• Dimensional inspection

• Surface roughness measurement

• Coating adhesion verification

Inspection reports are available upon request.

OEM / Built-to-Print Manufacturing

We support:

• Manufacturing based on 2D / 3D files (STEP, IGS, X_T, etc.)

• Custom taper and length designs

• High-cavity mold production

• Replacement cores for existing medical molds

Technical communication is maintained to ensure full specification alignment.

Technical FAQ

Q1: Why use HSS instead of stainless steel?
HSS provides higher hardness and better wear resistance for high-cycle molds.

Q2: Does TiN coating affect dimensional tolerance?
Coating thickness is controlled, and dimensions are adjusted before coating to maintain final accuracy.

Q3: Are long slender cores supported?
Yes. Precision grinding ensures straightness and concentricity for long micro-diameter cores.

Q4: Can these cores be used in 64+ cavity molds?
Yes. Multi-cavity uniformity is maintained through controlled batch machining.

Q5: Are medical-grade requirements supported?
Yes. Components can be produced for medical and laboratory mold applications.

Request a Technical Quotation

Please provide:

• 2D / 3D drawings

• Plastic material type

• Required cavity count

• Tolerance specification

• Surface finish requirement

• Quantity and delivery timeline

Our engineering team will review your specifications and provide a technical proposal.