THK LMK10 Linear Bushing
The LMK10 is a square-flange linear bushing from THK's LMK series, engineered for smooth, low-friction linear motion. Its square-flange design offers a lower core height than round-flange models, enabling more compact equipment assembly. Ideal for precision instruments, semiconductor manufacturing equipment, and automated machinery requiring stable linear guidance and easy mounting.
The LMK10 is a square-flange linear bushing from THK’s LMK series, engineered for smooth, low-friction linear motion. Its square-flange design offers a lower core height than round-flange models, enabling more compact equipment assembly. Ideal for precision instruments, semiconductor manufacturing equipment, and automated machinery requiring stable linear guidance and easy mounting.
Official Specifications
| Parameter | Value | Unit |
|---|---|---|
| Inscribed Bore Diameter (dr) | 10 | mm |
| Bore Diameter Tolerance | 0 / –0.013 | mm |
| Outer Diameter (D) | 19 | mm |
| Outer Diameter Tolerance | 0 / –0.009 | mm |
| Overall Length (L) | 29 | mm |
| Length Tolerance | ±0.3 | mm |
| Flange Diameter (D₁) | 39 | mm |
| Flange Diameter Tolerance | 0 / –0.2 | mm |
| Number of Ball Rows | 4 | — |
| Basic Dynamic Load Rating (C) | 206 | N |
| Basic Static Load Rating (C₀) | 265 | N |
| Mass | 30 | g |
| PCD (Mounting Hole Circle) | 32 | mm |
| Mounting Hole (d₁×d₂×h) | 5×9×5.5 | mm |
| Max Flange Perpendicularity | 15 | μm |
| Max Eccentricity | 15 | μm |
| Radial Clearance Tolerance | –5 | 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 |
| Standard Lubrication | Pre-lubricated with anti-rust oil | — |
| Seal Type (UU Option) | Double contact seals (both ends) | — |
Key Features
- Square Flange Compact Design: Four-sided flattened flange for lower profile installation and space-efficient designs.
- High Precision & Stability: Strict dimensional tolerances ensure ultra-smooth linear motion and minimal radial clearance.
- 4-Row Ball Configuration: Balanced radial load capacity and stable operation under moderate loads.
- Resin Retainer: Lightweight, low-noise ball circulation with consistent performance.
- Easy Mounting: Direct bolting via square flange without additional fixtures; interchangeable with standard LMK series shafts.
Official Notes
- Designed exclusively for linear motion; not intended for pure rotational or moment loads.
- LMK10UU variant includes double UU seals for enhanced dust protection and lubrication retention.
- Recommended shaft: Surface hardness ≥58 HRC, surface roughness Ra ≤0.4 μm.
- Operating temperature must not exceed 80°C to prevent retainer deformation and performance degradation.
- Re-lubricate with lithium-based grease periodically for extended service life.
