AISI D2 (1.2379) Precision Mold Parts | 58-62 HRC Hardened Injection Mold Inserts

Product Overview

1.2379 (D2) mold cores with a hardness range of 58–62 HRC are precision plastic mold parts designed for injection molds requiring high wear resistance and dimensional stability. Manufactured through precision CNC machining and controlled heat treatment, these mold cores maintain accurate geometry during long production cycles. All components are custom produced strictly according to customer drawings and technical specifications.

Key Features & Technical Advantages

• Manufactured from 1.2379 (D2) cold work tool steel

• Heat treated to 58–62 HRC for high wear resistance

• Excellent dimensional stability for precision mold cores

• Suitable for high-cavity and long production runs

• Consistent surface quality for reliable molding performance

• Good resistance to deformation under molding pressure

• Fully customized / OEM / Built-to-Print manufacturing

Applications & Industries

These 1.2379 mold cores are widely used in:

• Injection molds for packaging caps and closures

• Mold systems for bottle caps and sealing components

• Medical packaging molds and syringe-related tooling

• Plastic molds requiring high wear resistance and stable geometry

They are particularly suitable for applications demanding long tool life, high hardness, and consistent cavity accuracy.

Mold Structure & Design Description

Mold cores manufactured from 1.2379 are typically installed on the core side of injection molds and are responsible for forming critical internal product geometry.
Key design considerations include:

• Accurate core dimensions and profile geometry

• Proper fit and alignment with cavity and mold plates

• Structural integrity under injection pressure

• Compatibility with multi-cavity and interchangeable mold designs

All mold cores are designed and machined strictly according to customer drawings to ensure correct assembly and stable mold operation.

Manufacturing Capability & CNC Machining

Senlan Precision manufactures high-hardness mold cores using advanced CNC machining and finishing processes.
Our production facilities are equipped with high-precision machining centers and CNC systems from MAKINO (Japan) and HARDINGE (USA), along with other internationally recognized equipment, enabling:

• Precision machining prior to heat treatment

• Stable dimensional control for hardened mold cores

• Consistent surface quality after finishing processes

• Reliable repeatability across production batches

Machining routes and heat treatment processes are optimized to maintain dimensional accuracy at high hardness levels.

Custom Manufacturing & OEM Cooperation

We specialize in custom manufacturing and OEM cooperation, supporting:

• Built-to-Print production from 2D drawings or 3D models

• 1.2379 material processing and hardness control

• Custom core geometry for specific mold structures

• Small-batch prototyping and volume production

• Long-term supply of replacement and spare mold cores

Technical communication is maintained throughout the project to ensure accurate execution of specifications.

Quality Control & Export Experience

With over 20 years of experience in exporting precision mold components, Senlan Precision operates a structured quality control system:

• Incoming material inspection and traceability

• Dimensional inspection before and after heat treatment

• Hardness verification for 58–62 HRC range

• Final inspection prior to shipment with complete documentation

We are experienced in international technical communication, quality requirements, and export packaging standards.

Related Mold Components

• Precision mold cavity inserts

• Mold core pins

• Hardened mold inserts and sleeves

• Multi-cavity mold spare parts

All related products are available on a custom manufacturing basis.

Technical FAQ

Q1: Are 1.2379 mold cores manufactured strictly according to drawings?
Yes. All mold cores are produced strictly based on customer-provided drawings and specifications.

Q2: Why is 1.2379 suitable for high-hardness mold cores?
1.2379 offers excellent wear resistance and compressive strength after heat treatment, making it suitable for long-run injection mold applications.

Q3: Can 58–62 HRC hardness be consistently maintained?
Yes. Hardness is controlled through optimized heat treatment processes and verified during quality inspection.

Q4: Can these mold cores be used as replacement parts for existing molds?
Yes. Replacement and interchangeable mold cores can be manufactured to match existing mold designs.

Request a Quotation

For pricing, lead time, or technical discussion regarding 58–62 HRC 1.2379 mold cores for injection molds, please provide your drawings or technical specifications.
Our engineering team will review your requirements and provide a professional quotation accordingly.