Lock Ring Precision Components

Core & Injection Mold Cavity for PET Preform Mould

Manufacturer: precision-mouldparts

Product Overview

The Lock Ring Core & Cavity Components are critical precision parts used in PET preform injection mould systems.

In high-cavity preform molds, the lock ring structure secures and positions the cavity insert within the mold plate, ensuring:

• Accurate neck finish alignment

• Stable concentricity between core and cavity

• Reliable cavity positioning under injection pressure

• Easy maintenance and replacement

At precision-mouldparts, we manufacture high precision S136 lock ring cavity and core components for hot runner and cold runner PET preform molds, supporting systems up to 96 cavities.

All components are produced strictly according to customer drawings (OEM / Built-to-Print).

Function of Lock Ring System in Preform Molds

The lock ring system:

• Fixes the cavity insert into the mold plate

• Maintains accurate radial positioning

• Withstands injection pressure and thermal cycling

• Ensures repeatable neck finish precision

In multi-cavity PET molds, even small deviations can cause:

• Preform neck leakage

• Cap mismatch

• Uneven wall thickness

• Weight variation between cavities

Our machining process focuses on preventing these issues.

Engineering Focus & Machining Control

1️⃣ Concentricity & Positioning Accuracy

Critical control areas:

• Lock ring outer diameter tolerance

• Cavity insert fit tolerance

• Concentricity between thread and core axis

• Axial alignment stability

Tolerance capability: up to ±0.005 mm (customizable).

Stable positioning ensures consistent preform neck finish across all cavities.

2️⃣ Surface Finish & PET Transparency

Material: S136 stainless mold steel

Processing includes:

• Precision CNC machining

• OD / ID grinding

• Thread grinding

• Mirror polishing

High-quality polishing ensures:

• Transparent PET preforms

• Smooth demolding

• Reduced cycle friction

• Extended service life

3️⃣ Multi-Cavity Consistency

For 16, 32, 48, 72, 96 cavity molds, we ensure:

• Interchangeable cavity inserts

• Uniform center distance

• Equal cavity volume

• Balanced fit between lock ring and plate

Consistency is essential for stable high-speed PET production.

Technical Specifications

Material: S136
Tolerance: ±0.005 mm
MOQ: 1 piece
Production capacity: 2000 pieces per week
Lead time: 7–20 days
Drawing formats: PDF, DWG, DXF, IGS, STEP

Each component is inspected by CMM before shipment.

Manufacturing Equipment

Our facility includes:

• CNC machining centers

• CNC lathes

• EDM (wire & sinker)

• OD / ID grinding machines

• Precision surface grinding

Inspection systems:

• CMM

• Hardness tester

• Height gauge

• 2.5D projector

All parts undergo full dimensional inspection and surface verification.

Typical Applications

Our lock ring cavity & core components are used in:

• PET beverage bottle preform molds

• Cosmetic bottle preform molds

• Medical packaging preform molds

• High-speed cap & closure molds

• Thin-wall injection molds

Suitable for both hot runner and cold runner systems.

OEM / Built-to-Print Workflow

1️⃣ Drawing review & engineering evaluation
2️⃣ Material confirmation (S136 or customized)
3️⃣ Machining process planning
4️⃣ CNC turning & grinding
5️⃣ Heat treatment & stress control
6️⃣ Final polishing
7️⃣ CMM inspection
8️⃣ Export packaging

NDA supported for confidential mold projects.

Why Choose precision-mouldparts

✔ Strong experience in PET preform mold components
✔ Expertise in multi-cavity positioning systems
✔ Stable concentricity and tolerance control
✔ Advanced machining and inspection capability
✔ Fast technical response within 24 hours
✔ Global export experience
✔ Competitive pricing with premium quality

Recommended Products

To support complete PET preform mold systems, we also manufacture:

• Preform core pins

• Neck finish thread cores

• S136 cavity inserts

• Multi-cavity mold components

• Hot runner nozzle tips

• Ejector pins and sleeves

• Slide retainers and angle pins

• HASCO / DME / Misumi compatible mold components

All products are available under OEM / Built-to-Print manufacturing.

Frequently Asked Questions

Q1: Can you produce lock ring cavities for 72 or 96 cavity molds?
Yes. We specialize in high-cavity PET preform mold components.

Q2: How do you ensure concentricity between core and cavity?
Through precision machining, controlled grinding, and full CMM inspection.

Q3: Is S136 suitable for PET preform molding?
Yes. It offers corrosion resistance and excellent polishing capability.

Q4: Do you accept small trial orders?
Yes. Sample and small-volume orders are supported.

Request a Technical Quotation

Please provide:

• Cavity quantity

• Neck finish specification

• Material requirements

• Tolerance requirements

• 2D/3D drawings

Our engineering team will review your lock ring core & cavity project and provide a detailed quotation within 24 hours.