Non-Magnetic WC-Ni Carbide Precision Mold Guide with 90-92 HRA Hardness and Customizable Dimensions
Our Non-Magnetic Alloy Ejector Pin Guide Bushings are engineered specifically to overcome these challenges. Manufactured from advanced WC-Ni (Tungsten Carbide-Nickel) alloy—a specialized non-magnetic cemented carbide—these precision components deliver the essential combination of absolute magnetic neutrality, exceptional wear resistance, and micron-level precision for the most demanding injection molding applications
With a hardness of 90-92 HRA, WC-Ni alloy provides wear resistance that exceeds tool steel by a factor of 50-100x . Key mechanical properties include:
| Property | Typical Value |
|---|---|
| Hardness | 90-92 HRA (1,700-1,900 HV) |
| Density | 14.5-15.0 g/cm³ |
| Elastic Modulus | 530-700 GPa |
| Compressive Strength | >4,000 MPa |
| Flexural Strength | 2,000-2,900 MPa |
This exceptional hardness ensures consistent precision over millions of cycles without bushing wear, eliminates play or slop that develops in steel bushings over time, and significantly reduces maintenance intervals and total cost of ownership.
Proper support of ejector pins is critical for preventing pin deflection, bending, and premature failure. Our bushings feature:
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Precision-matched clearances of 0.005-0.015mm for optimal pin guidance
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Balanced wall thickness for uniform thermal expansion and mechanical strength
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Optional lubrication features including spiral grooves, axial oil channels, and grease pockets
| Property | Our WC-Ni Guide Bushing | Hardened Steel Bushing (SKD61/SUJ2) | Standard WC-Co Carbide Bushing |
|---|---|---|---|
| Magnetic Permeability (µ) | < 1.002 (Non-Magnetic) | > 100 (Highly Magnetic) | 1.5-2.0 (Magnetic) |
| Hardness | 90-92 HRA | 50-55 HRC (SUJ2: 60-64 HRC) | 90-92 HRA |
| Wear Life | Millions of cycles (50-100x steel) | Moderate | Exceptional |
| Corrosion Resistance | Excellent (Ni binder) | Good | Good |
| Thermal Stability | Excellent (low thermal expansion) | Moderate | Excellent |
| Load Capacity | >4,000 MPa compressive | Moderate | Very High |
| Ideal Application | Medical, electronics, ferrite molding | General purpose | Not suitable for magnetic-sensitive uses |
Ejector pin guide bushings serve four essential functions in precision injection molds:
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Connect and Align: Provide precise connection between ejector plates and the mold base, ensuring accurate pin alignment
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Maintain Proper Clearance: Preserve optimal pin-to-bushing clearance to prevent binding or excessive wear
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Withstand Lateral Forces: Resist side loading that can cause pin deflection, bending, or breakage
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Extend Mold Life: Reduce wear on ejector pins and mold plates, prolonging overall mold service life
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