Product Overview

QRO90 mold core pins are precision-machined tooling components designed for injection molding and die casting moulds operating under high thermal and mechanical load. Manufactured by Senlan Precision, these core pins are produced on a built-to-print basis, with controlled hardness of 46–48 HRC to balance wear resistance and toughness for stable, long-term mould operation.

Core Features & Technical Advantages

• Material: QRO90 Hot Work Tool Steel
  Optimized for thermal fatigue resistance and dimensional stability

• Controlled Hardness: 46–48 HRC
  Reduces brittleness while maintaining wear resistance under cyclic load

• High-Precision CNC Machining
  Tight control of diameter, straightness, and concentricity

• Customized Size & Geometry
  Length, diameter, steps, and end profiles per customer drawings

• Built-to-Print / OEM Manufacturing
  No standard sizes; all parts manufactured strictly to specifications

Application Scenarios / Industry Applications

• Injection Molding Mould Core Systems

• Die Casting Mould Core Pins

• Bottle Cap and Closure Moulds

• Medical Packaging and Syringe Moulds

• Multi-Cavity and High-Output Mould Tools

These QRO90 core pins are typically applied where thermal stability, controlled hardness, and repeatable accuracy are required over extended production cycles.

Mould Structure & Design Explanation

In injection molding and die casting moulds, core pins form internal geometries and directly influence product accuracy and mould wear behavior.
Using QRO90 material at 46–48 HRC helps:

• Minimize thermal cracking under repeated heating and cooling

• Maintain core alignment during high-cycle production

• Extend service life in multi-cavity mould configurations

Proper core pin design also improves cavity balance and reduces maintenance frequency.

Manufacturing Capability & CNC Machining Capacity

Senlan Precision manufactures QRO90 mold core pins using a controlled process chain:

• CNC Turning & Milling for dimensional accuracy

• Precision Grinding for straightness and surface finish

• Heat Treatment Control to achieve uniform 46–48 HRC hardness

• EDM (optional) for complex end features or profiles

Typical capability range:

• Diameter tolerance: ±0.005–0.01 mm

• Straightness and concentricity: per drawing requirement

Custom Development / OEM Cooperation Process

1. Drawing & Technical Review
   Geometry, tolerance, hardness, and working conditions

2. Process Planning
   Machining route and heat treatment definition

3. Precision Machining & Heat Treatment
   In-process dimensional checks

4. Final Inspection
   Hardness, dimensions, and surface condition

5. Batch Supply & Repeat Orders
   Suitable for mould production and long-term maintenance programs

Quality Control & Export Experience

• ISO 9001 quality management system

• Verified QRO90 material sourcing and traceability

• Hardness testing to confirm 46–48 HRC range

• Dimensional inspection using calibrated measuring equipment

• Stable export experience for precision mould components

Inspection reports and material certificates are available upon request.

Related Precision Mould Components (Internal Links)

• Precision Mold Core Inserts

• Injection Mold Core Pins

• Die Casting Mold Components

• Custom Mold Cavities

• High-Precision CNC Mold Parts

Frequently Asked Questions (FAQ)

Q1: Why choose QRO90 for mold core pins?
A: QRO90 offers excellent resistance to thermal fatigue and cracking, making it suitable for injection molding and die casting applications with frequent thermal cycling.

Q2: Are these core pins standard items?
A: No. All core pins are manufactured to customer drawings only.

Q3: Can hardness be adjusted outside 46–48 HRC?
A: Hardness can be discussed during technical review, depending on application requirements.

Q4: Can stepped or long core pins be produced?
A: Yes. Length, stepped diameters, and special end geometries are supported.

Request a Technical Quotation

For QRO90 mold core pins, custom die casting core components, or precision injection mould tooling, please send your drawings and technical requirements to Senlan Precision.
Our engineering team will provide a technical feasibility review and detailed quotation.