H13 (SKD61) Core Pins for Plastic Bottle Molds | Precision Internal Hole Tooling

Product Overview

Inner hole precision mould parts manufactured from SKD61 tool steel are designed for plastic bottle injection moulds requiring stable internal geometry and long service life. Senlan Precision supplies custom SKD61 core pins produced strictly to customer drawings, focusing on inner hole accuracy, concentricity, and thermal stability under continuous injection molding conditions.

Core Features & Technical Advantages

• Built-to-Print manufacturing based on customer drawings

• SKD61 hot work tool steel for thermal stability and wear resistance

• High-precision inner hole machining and finishing

• Stable dimensional control for long production cycles

• Optimized hardness balance for strength and toughness

• Suitable for multi-cavity bottle and packaging mould systems

Application Scenarios / Industry Use

These SKD61 inner hole core pins are widely applied in:

• Plastic bottle injection moulds

• Packaging cap and closure mould systems

• Medical and laboratory plastic container moulds

• High-output multi-cavity injection moulds

Applications are limited to packaging and medical-related injection molding, excluding automotive use.

Mould Structure & Design Description

In plastic bottle moulds, inner hole core pins directly determine internal geometry, flow behavior, and demoulding stability.

Design considerations include:

• Inner hole straightness and surface quality

• Concentricity between inner hole and outer profile

• Heat resistance under repeated injection cycles

• Accurate fit with cavity inserts and cooling systems

• Controlled clearance to prevent deformation or flash

Each SKD61 core pin is engineered to integrate precisely into the customer’s mould structure.

Manufacturing Capability & CNC Machining

Senlan Precision produces SKD61 core pins using advanced CNC machining and precision finishing processes.

Key capabilities include:

• CNC turning and milling for complex geometries

• Deep hole drilling and inner hole grinding

• Precision OD and ID grinding

• Controlled heat treatment for stable hardness

• Full dimensional inspection before delivery

High-precision equipment from MAKINO (Japan) and HARDINGE (USA) ensures consistent accuracy and repeatability.

Custom Development / OEM Cooperation Process

All SKD61 inner hole core pins are supplied under Custom / OEM / Built-to-Print cooperation.

Standard process:

1. Drawing and technical requirement review

2. Material and heat treatment confirmation

3. CNC machining and precision grinding

4. Dimensional and inner hole inspection

5. Packaging and export delivery

Both prototype development and long-term production supply are supported.

Quality Control & Export Experience

Quality control includes:

• Incoming material verification

• In-process dimensional inspection

• Inner hole concentricity and surface finish checks

• Final inspection against customer drawings

• Traceable records for repeat orders

Senlan Precision supplies precision mould parts to international B2B customers with consistent quality standards.

Related Products

• SKD61 mould core pins and inserts

• Precision cavity inserts for bottle moulds

• Ejector pins for packaging injection moulds

• Non-standard injection mould spare parts

All related components are custom-manufactured to drawings.

Technical FAQ

Q1: Are these SKD61 core pins standard parts?
No. All core pins are non-standard and manufactured strictly according to drawings.

Q2: Why is SKD61 suitable for inner hole mould parts?
SKD61 offers good heat resistance, toughness, and dimensional stability under continuous injection molding.

Q3: Can inner hole tolerances be customized?
Yes. Inner hole tolerances and surface finish are controlled according to customer requirements.

Q4: Do you support long-term OEM supply for bottle mould projects?
Yes. Stable OEM cooperation for repeat production is fully supported.

Request a Quotation

For Inner Hole Precision SKD61 Core Pins for Plastic Bottle Injection Moulds, please submit your drawings and technical specifications.
Our engineering team will evaluate your requirements and provide a technical quotation.