THK LMF30 Linear Bushing
The LMF30 is a high-precision round flange linear bushing from THK's LMF series, designed for smooth, low-friction linear motion. Its integrated flange enables direct bolting to the housing for easy, secure installation, making it ideal for industrial automation, precision machinery, and motion control systems requiring high rigidity and accurate positioningTHK.
The LMF30 is a high-precision round flange linear bushing from THK’s LMF series, designed for smooth, low-friction linear motion. Its integrated flange enables direct bolting to the housing for easy, secure installation, making it ideal for industrial automation, precision machinery, and motion control systems requiring high rigidity and accurate positioning.
Official Specifications
| Parameter | Value | Unit |
|---|---|---|
| Inscribed Bore Diameter (dr) | 30 | mm |
| Bore Diameter Tolerance | 0 / –0.010 | mm |
| Outer Diameter (D) | 45 | mm |
| Outer Diameter Tolerance | 0 / –0.016 | mm |
| Overall Length (L) | 64 | mm |
| Length Tolerance | ±0.3 | mm |
| Flange Diameter (D₁) | 74 | mm |
| Flange Diameter Tolerance | 0 / –0.2 | mm |
| Ball Rows | 6 | — |
| Basic Dynamic Load Rating (C) | 1570 | N |
| Basic Static Load Rating (C₀) | 2750 | N |
| Mass | 460 | g |
| PCD (Mounting Hole Circle) | 60 | mm |
| Mounting Hole Size (d₁×d₂×h) | 6.6×11×6.5 | mm |
| Max Flange Perpendicularity | 15 | μm |
| Max Eccentricity | 15 | μm |
| Radial Clearance Tolerance | –9 | μm |
| Retainer Material | Synthetic Resin | — |
| Outer Sleeve Material | High-carbon Chromium Bearing Steel (SUJ2) | — |
| Ball Material | Hardened Steel | — |
| Operating Temperature Range | –10°C to +80°C | °C |
| Lubrication | Pre-lubricated; lithium-based grease recommended | — |
Key Features (Official Description)
- Easy Installation: Integrated round flange allows direct bolting to the housing, simplifying setup.
- High Precision: Strict dimensional tolerances ensure smooth, accurate linear motion.
- High Load Capacity: Six-row ball design delivers excellent dynamic and static load performance.
- High Rigidity: Stable ball guidance for reliable operation in high-demand applications.
- Standard Interchangeability: Fully compatible with THK LMF-series shafts and standard linear systems.
Official Notes
- For linear motion only; not suitable for pure rotational or moment loads.
- Operating temperature must not exceed 80°C to preserve performance and lifespan.
- Shaft requirements: Surface hardness ≥58 HRC, surface roughness Ra ≤0.4 μm.
- Recommended lubrication: Lithium-based grease; periodic re-lubrication advised for long life.
