THK LMH20LUU Linear Bushing (Long Type, Oval Cut Flange)
THK LMH20LUU is a long‑type, oval‑cut flange linear bushing with double‑lip seals (UU), designed for high‑rigidity linear motion with excellent moment load capacity. It features an integrated oval flange for compact installation and dual retainers for extended support, ideal for light‑to‑medium load systems requiring stable guidance.
THK LMH20LUU is a long‑type, oval‑cut flange linear bushing with double‑lip seals (UU), designed for high‑rigidity linear motion with excellent moment load capacity. It features an integrated oval flange for compact installation and dual retainers for extended support, ideal for light‑to‑medium load systems requiring stable guidance.
Official Specifications
| Parameter | Value |
|---|---|
| Inscribed Bore Diameter (dr) | 20 mm (0 / −0.010 mm) |
| Outer Diameter (D) | 32 mm (0 / −0.016 mm) |
| Overall Length (L) | 80 mm |
| Flange Diameter (D₁) | 54 mm |
| Flange Width (K) | 38 mm |
| Mounting Hole (d₁×d₂×h) | 5.5×9.2×5.4 mm |
| Ball Rows | 5 rows |
| Basic Dynamic Load Rating (C) | 1726 N |
| Basic Static Load Rating (C₀) | 2740 N |
| Permissible Static Moment (Mo) | 17.26 N·m |
| Mass | 279 g |
| Retainer Material | Synthetic resin |
| Seal Type | UU (double‑lip seals, both ends) |
| Outer Cylinder Material | Bearing steel (SUJ2) |
| Lubrication | Pre‑lubricated with anti‑rust oil |
| Operating Temperature | −15 °C to 80 °C |
| Accuracy Grade | Normal grade |
Key Features
- Oval‑cut flange design enables lower center height vs. square‑flange types, supporting compact machine layouts.
- Long‑type construction with dual retainers delivers superior moment load resistance and running stability.
- UU double‑lip seals provide reliable dust and contamination protection for harsh industrial environments.
- Synthetic resin retainer ensures smooth, low‑friction, and quiet linear movement.
- Optimized ball raceway alignment: two rows support loads from the flattened flange side, enhancing service life.
- Compatible with hardened precision LM shafts (recommended hardness ≥58 HRC).
Applications
Suitable for automation equipment, packaging machinery, measuring instruments, 3D printers, semiconductor manufacturing equipment, and light‑to‑medium load linear motion systems requiring high‑rigidity, moment‑resistant guidance with compact installation.
