Precision Ground Thread Cores | Cold Work Steel Inserts for Consumer Plastic Molds

Product Overview

Senlan Precision manufactures cold work die steel thread core inserts using cylindrical grinding for high concentricity and dimensional stability. These inserts are engineered for injection moulds producing daily-necessity plastic parts where thread accuracy, wear resistance, and repeatability are critical. All components are supplied strictly on a customized / OEM / Built-to-Print basis.

Key Features & Technical Advantages

• Cold work die steel selected for high wear resistance and edge stability

• Cylindrical grinding process for superior roundness and concentricity control

• Stable thread geometry under long production cycles

• Consistent dimensional repeatability in multi-cavity mould applications

• Precision-machined interfaces for accurate mould assembly

• Fully customized dimensions, thread profiles, and tolerances per drawing

Application Scenarios / Industry Applications

• Thread cores for daily-necessity plastic parts

• Bottle caps and closure components

• Multi-cavity injection moulds requiring uniform thread performance

• High-cycle moulds with strict dimensional control requirements

• Packaging-related plastic mould tooling

Mold Structure & Design Description

The thread core insert forms the internal or external threaded structure of plastic parts and directly affects assembly fit and functional consistency. Cold work die steel provides excellent abrasion resistance, while cylindrical grinding ensures controlled roundness and concentricity between the thread profile and locating surfaces, supporting stable mould operation across extended production runs.

Manufacturing Capability & CNC Machining Capacity

Senlan Precision integrates precision machining and grinding processes for mould components:

• MAKINO CNC milling centers (Japan)

• HARDINGE CNC turning machines (USA)

• High-precision CNC turning, milling, cylindrical grinding, and surface grinding

• Coordinated heat treatment for cold work die steels

Typical achievable tolerances on functional features range from ±0.003–0.01 mm, depending on geometry and inspection method.

Custom Development / OEM Cooperation Process

1. Review of customer drawings and technical requirements

2. Material selection and heat-treatment confirmation

3. Machining route and tolerance feasibility analysis

4. CNC machining and cylindrical grinding

5. Final inspection, packaging, and export shipment

All parts are produced strictly according to Built-to-Print OEM specifications.

Quality Control & Export Experience

• Raw material verification and traceability

• In-process inspection of critical diameters and thread features

• Final inspection for concentricity, roundness, and dimensional accuracy

• Quality procedures aligned with packaging and medical mould supply standards

• Extensive export experience supporting global mould manufacturers

Related Products Recommendation

• Threaded core inserts and core sleeves

• Mold cavity inserts and core pins

• Wear-resistant inserts for multi-cavity moulds

• Precision mould spare parts

FAQ – Technical & Procurement

Q1: Which cold work die steels can be used for thread core inserts?
Common options include D2 / 1.2379 or equivalent grades, selected based on wear and life requirements.

Q2: Why is cylindrical grinding important for thread cores?
It improves roundness and concentricity, which directly affects thread accuracy and mould stability.

Q3: Can this insert be used in multi-cavity moulds?
Yes. Cylindrical grinding helps ensure consistent dimensions across all cavities.

Q4: Do you support small-batch or prototype orders?
Yes. Prototype, pilot, and series production are all supported.

Q5: Are surface treatments available?
Surface treatments can be discussed based on mould operating conditions and service life requirements.

Get a Quote

For pricing, lead time, or technical evaluation of cold work die steel thread core inserts with cylindrical grinding, please contact Senlan Precision with your drawings. Our engineering team will provide a detailed quotation and manufacturability feedback.