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SUJ2 Bearing Steel Flange Guide Post & Bushing Assembly
This integrated mold guide assembly is precision CNC turned and ground for injection mold and automation equipment, composed of segmented multi-step polished guide pin and black nitrided flanged guide bushing. It acts as high-precision alignment component for mold clamping, fixture positioning and linear reciprocating automation stations.
- Material: SUJ2 High Carbon Bearing Steel
Hardness: HRC 60–64 after quenching & tempering
Tolerance: ±0.001 mm
Surface Finish: Mirror Polished Guide Shaft + Matte Black Gas Nitrided Bushing
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High-Precision Mold Alignment Engineering
Three segmented annular oil storage grooves on the guide pin evenly distribute lubricating grease to form a uniform oil film between shaft and bushing, effectively reducing dry friction and wear during frequent reciprocating sliding. Flanged base bushing with symmetrical mounting holes realizes flat fixed installation on mold plates and fixture frames, tight clearance fit between pin and bushing guarantees ultra-high parallelism and concentricity during mold closing to eliminate mold core offset and flash defects. Integrated monolithic structure without assembled gaps maintains stable alignment precision over millions of mold opening/closing cycles.
Ultra-High Hardness SUJ2 Bearing Steel Construction
SUJ2 bearing steel delivers superior wear resistance for long-cycle precision positioning:
- Full quenching heat treatment achieves ultra-high surface hardness, excellent anti-abrasion performance against long-term reciprocating friction, extending service life for high-volume mass production molds
- Uniform fine grain structure ensures stable dimensional consistency under repeated temperature cycling from mold heating and cooling
- Mirror grinding process eliminates surface micro unevenness, avoiding scratch galling between matching shaft and bushing surfaces
- Nitriding treatment on the outer bushing surface boosts anti-rust performance, adapting to humid workshop environments with cooling water splash Ideal for multi-cavity precision injection molds, stamping dies and high-speed automated linear positioning equipment.
Custom Guide Post Assembly Support
- Custom guide pin total length, segment groove spacing, flange outer diameter and inner bore fit clearance based on customer mold CAD drawings
- Optional surface upgrades: Hard Chrome Plating, DLC Low-Friction Coating, Anti-Rust Black Oxide
- DFM mold consultation: clearance tolerance matching, lubrication groove optimization, load-bearing rigidity design
- Fast single-set prototype sampling and mass batch mold guide component delivery
Key Features & Advantages
- Multi-Segment Lubrication Groove Design: Uniform oil storage grooves maintain continuous lubrication to reduce friction and component wear.
- Mirror Polished Precision Shaft: Ultra-smooth surface prevents galling and ensures smooth silent reciprocating sliding.
- Flanged Fixed Bushing Base: Symmetrical mounting holes for flat stable installation, preventing bushing displacement during high-pressure mold clamping.
- High Hardness Heat-Treated Bearing Steel: Extreme abrasion resistance for millions of high-cycle mold clamping operations.
- Fully Customizable Sizing: Adjust shaft length, groove layout and flange dimension to match unique mold and automation alignment demands.
Technical Specifications
| Parameter | Specification |
|---|---|
| Base Material | SUJ2 High Carbon Bearing Steel |
| Alternative Materials | Cr12MoV Wear Steel, 40Cr Alloy Steel |
| Hardness | HRC 60–64 (SUJ2 quenched) |
| Dimensional Tolerance | ±0.001mm for shaft outer diameter, bushing inner bore & flange flatness |
| Coaxiality of Guide Shaft | ≤0.001mm per 100mm shaft length |
| Surface Roughness | Ra ≤0.02μm mirror polished shaft; Ra ≤1.6μm nitrided matte bushing |
| Manufacturing Processes | CNC Turning, Precision Cylindrical Grinding, Heat Treatment, Gas Nitriding, Lubrication Groove Milling |
| Surface Treatments | Gas Nitriding, Hard Chrome Plating, DLC Anti-Friction Coating |
| Customization | 100% Fully Customized via CAD Drawings & Mold Samples |
Applications
Precision Multi-Cavity Injection Molds
Flange guide post assemblies for consumer electronics, cosmetic packaging multi-cavity molds. High-precision fit eliminates mold flash and core misalignment during high-speed mass production.
Automotive Component Stamping Dies
Heavy-duty guide pin sets for automotive metal stamping molds, high hardness bearing steel withstands continuous high-pressure clamping friction.
Automated Linear Assembly Equipment
Positioning guide assemblies for robotic feeding and battery component assembly lines, low-friction polished shaft ensures stable high-speed reciprocating positioning.
Household Appliance Plastic Molds
Mold alignment guide posts for air conditioner, washing machine shell molds, nitrided bushing resists rust from mold cooling water splash.
Medical Disposable Molding Tools
Custom small-size guide post units for medical plastic part precision molds, stable dimensional precision avoids burr defects on medical finished products.
