Core Pin Machining｜High-Precision Pins for Automotive Electrical Components and Semiconductors (SKH51 & Cemented Carbide Compatible)
Core pins are precision components widely used in automotive electrical components, electronic parts, and the semiconductor field. They play a crucial role in determining molding accuracy, particularly in the molding of resin parts for medical and semiconductor applications. Sanwa Creation Co., Ltd. manufactures high-precision core pins using materials such as SKH51, cemented carbide, and zirconia ceramics.

◇Applications and Role of Core Pins
Core pins are components used to form hollow sections or fine holes within molded parts. They are indispensable for stabilizing shapes, primarily in resin molding and metal processing. They are utilized across a wide range of fields, including the molding of automotive electrical components and electronic parts, as well as the processing of semiconductor components.
High-precision core pins are particularly demanded for creating accurate hole diameters and hollow sections in applications like inkjet printer head processing and the molding of resin parts for medical devices. Furthermore, since they are often used in high-temperature environments, selecting materials with heat resistance is crucial.

◇ Materials Suitable for Core Pins
1. SKH51 (High-Speed Steel)
SKH51 offers high wear resistance, heat resistance, and impact strength, making it ideal for mold applications demanding durability. It delivers stable performance, particularly during the molding of automotive electrical components and electronic parts.

2. Cemented Carbide
Characterized by high hardness, wear resistance, and long-term precision retention. Suitable for applications requiring micro-hole formation, such as inkjet printer head machining.

3. Zirconia Ceramics
Excellent heat resistance and non-magnetic properties make it ideal for molding resin parts for semiconductors and medical applications. Maintains stable shape even when resin temperatures rise during molding.

◇Product Specifications
- Material: SKH51, cemented carbide, zirconia ceramics
- Precision: 1/1000 mm or less
- Dimensions: Outer diameter φ0.01 to φ20, total length up to 240L
- Lot size: 1 to unlimited
- Shape Capabilities: Irregular shapes (elliptical, stepped), LAP machining possible

We can accommodate special shapes, including multiple stepped profiles and elliptical pins. Custom manufacturing to your desired dimensions is available, enabling tailored solutions for specific applications.

◇Core Pin Features
1. High-Precision Machining
Utilizing centerless grinding technology, we achieve outer diameter tolerances of ±0.1μm and roundness of 0.06μm. Dimensional accuracy is maintained even for complex shapes.

2. Heat Resistance & Wear Resistance
Using materials like SKH51 steel and zirconia ceramics ensures minimal shape change and long service life even in high-temperature environments. They withstand temperature fluctuations during resin molding, supporting stable processing.

3. High Customizability
We can accommodate elliptical, stepped, and LAP finishes according to shape, enabling the production of core pins optimized for specific applications.

◇Applications and Use Cases
Core pins are widely utilized in the following fields:

- Molding connectors for automotive electrical components
- Hollow molding of electronic components
- Precision hole formation in semiconductor components
- Precision machining of inkjet printer heads
- Hollow forming of medical resin components

Particularly in automotive electrical components and electronic parts, the high precision of core pins is indispensable for the precise molding of connectors. Furthermore, in the semiconductor field, ultra-fine-diameter core pins are utilized for micro-hole formation.