Custom CNC Ejector Pins | Internal & External Lapping | Mirror Surface Finish

Product Overview

Custom CNC die ejector pins are precision mould components manufactured with internal and external lapping processes to achieve stable surface quality and dimensional accuracy. These ejector pins are designed for plastic injection moulds requiring smooth ejection, reduced friction, and consistent performance in multi-cavity and high-precision mould systems. All parts are produced strictly according to customer drawings and technical specifications.

Key Features & Technical Advantages

• CNC turning combined with internal and external lapping machining

• Excellent surface finish for reduced friction during ejection

• High dimensional consistency and straightness control

• Stable performance under continuous moulding cycles

• Suitable for precision and multi-cavity mould designs

• Custom materials, diameters, lengths, and head styles available

• OEM supply and Built-to-Print manufacturing supported

Applications & Industry Use

• Bottle cap and closure injection moulds

• Packaging container and thin-wall mould systems

• Medical consumables and disposable product moulds

• High-cavity injection moulds requiring reliable ejection

• Precision moulds with strict surface and tolerance requirements

Mould Structure & Design Description

Ejector pins are critical moving components within the mould ejection system. Internal and external lapping improves surface smoothness and roundness, which helps to:

• Minimize wear between ejector pins and guide holes

• Reduce the risk of sticking or galling

• Improve repeatability in high-cycle moulding

• Maintain stable ejection force distribution

Pin geometry, surface finish, and tolerances are defined based on mould layout and part design.

Manufacturing Capability & CNC Machining Capacity

• CNC turning for precise outer geometry

• Internal and external lapping for surface refinement

• Precision grinding for straightness and diameter control

• Controlled heat treatment upon request

• In-process and final dimensional inspection

• Capability for both prototype and batch production

Custom Development & OEM Cooperation Process

1. Review of customer drawings or technical data

2. Confirmation of material, hardness, and surface requirements

3. Process planning for CNC and lapping operations

4. Sample approval if required

5. Batch production with inspection records

We specialize in custom ejector pins, OEM manufacturing, and drawing-based production for injection mould applications.

Quality Control & Export Experience

• Incoming material inspection

• In-process dimensional and surface checks

• Straightness and concentricity verification

• Final inspection before shipment

• Experience supplying precision mould components to international customers

Related Products (Internal Links)

• Precision Mold Core Pins

• Sleeve Ejectors

• Custom Mold Inserts

• Multi-Cavity Injection Mold Components

Frequently Asked Questions (FAQ)

Q1: What is the advantage of internal and external lapping for ejector pins?
Lapping improves surface finish and roundness, reducing friction and wear during repeated ejection cycles.

Q2: Can you manufacture ejector pins strictly according to drawings?
Yes. All ejector pins are produced on a Built-to-Print basis using customer-provided drawings or specifications.

Q3: Are these ejector pins suitable for high-cavity moulds?
Yes. They are designed for stable performance in high-cavity and precision mould systems.

Q4: Can replacement ejector pins be produced for existing moulds?
Yes. Replacement parts can be manufactured based on drawings or samples.

Get a Quote

For custom CNC die ejector pins with internal and external lapping machining, please share your drawings or technical requirements.
Our engineering team will review your project and provide a detailed technical quotation.