Custom Double-Start Threaded Cores | SKD61 & S136 Steel Bottle Cap Mold Parts

Product Overview

Double thread core plastic mould parts are critical functional components used in bottle cap injection molds where multi-start or dual-thread structures are required. Manufactured from SKD61 or S136 tool steel, these thread core inserts ensure accurate thread formation, stable demolding, and long service life under high-cycle production. Senlan Precision supplies double thread core parts strictly based on customer drawings under a built-to-print OEM manufacturing model.

Key Features & Advantages

• Double thread core design for complex bottle cap thread structures

• Available materials: SKD61 / S136 tool steel

• High dimensional stability for consistent thread engagement

• Suitable for multi-cavity bottle cap molds

• Controlled heat treatment for wear resistance and durability

• Precision machining for reliable mold assembly and operation

• Fully customized production according to customer specifications (OEM / Built-to-Print)

Applications / Industry Use

• Plastic bottle caps with double or multi-start threads

• Packaging caps and closures requiring precise thread alignment

• High-speed injection molding lines

• Multi-cavity cap molds for packaging applications

• Plastic packaging components with rotational demolding requirements

Mold Structure & Design Description

Double thread core inserts are designed to form internal double-thread geometries in bottle cap molds. Compared to single-thread designs, double thread cores require stricter control of concentricity, lead angle, and profile accuracy. Proper material selection and machining precision are essential to ensure smooth demolding and stable thread quality throughout the mold’s service life. These cores are typically integrated into unscrewing or rotating mold mechanisms.

Manufacturing Capability & CNC Machining

Senlan Precision manufactures double thread core mould parts using advanced CNC machining and precision finishing processes. Production is supported by high-accuracy machining centers from MAKINO and precision turning equipment from HARDINGE, ensuring stable dimensional control and repeatable quality.

Manufacturing processes include:

• CNC turning and milling

• Precision thread profile machining

• Heat treatment and hardness control

• Grinding and secondary finishing

• Dimensional and profile inspection

Custom Development / OEM Cooperation Process

1. Customer provides 2D drawings or 3D models

2. Technical review of thread design and material requirements

3. Machining and heat treatment process planning

4. Precision manufacturing and finishing

5. Quality inspection and dimensional verification

6. Export packing and delivery

All parts are produced strictly under a Built-to-Print OEM cooperation model.

Quality Control & Export Experience

• Incoming material inspection and traceability

• In-process inspection for thread profile and concentricity

• Final dimensional verification before shipment

• Standardized quality management procedures

• Experience supplying precision mold components to international customers

Related Products

• Single and multi-start thread core inserts

• Mold core pins and cavity inserts

• Precision unscrewing mold components

• Multi-cavity bottle cap mold parts

• Customized non-standard plastic mold components

FAQ – Technical & Purchasing

Q1: What is the advantage of a double thread core design?
Double thread cores allow faster assembly and improved thread engagement while maintaining molding efficiency.

Q2: Which material should be selected, SKD61 or S136?
Material selection depends on production volume, corrosion resistance requirements, and mold operating conditions.

Q3: Can you manufacture based only on drawings?
Yes. All products are manufactured strictly according to customer drawings and specifications.

Q4: Are these parts suitable for high-cavity cap molds?
Yes. They are designed for stable performance in multi-cavity bottle cap molds.

Request a Quote

Please send your drawings, material specifications, tolerance requirements, and estimated order quantity.
Our engineering team will review your request and provide a technical quotation accordingly.