THK LM50UU Linear Bushing
The LM50UU is a standard‑type linear ball bushing from THK’s LM series, designed for infinite linear motion with low friction and high precision. It features a precision‑ground steel outer sleeve, a synthetic resin retainer, and 6 rows of recirculating steel balls, optimized for radial loads and smooth reciprocating motion. It is widely used in automation equipment, semiconductor machinery, measuring instruments, and other precision linear motion systems.
The LM50UU is a standard‑type linear ball bushing from THK’s LM series, designed for infinite linear motion with low friction and high precision. It features a precision‑ground steel outer sleeve, a synthetic resin retainer, and 6 rows of recirculating steel balls, optimized for radial loads and smooth reciprocating motion. It is widely used in automation equipment, semiconductor machinery, measuring instruments, and other precision linear motion systems.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Inscribed bore diameter (dr) | 50 | mm |
| Outer diameter (D) | 80 | mm |
| Overall length (L) | 100 | mm |
| Number of ball rows | 6 | — |
| Basic dynamic load rating (C) | 3,820 | N |
| Basic static load rating (C₀) | 7,940 | N |
| Mass | 1,580 | g |
| Shaft diameter tolerance | g6 (0 / –0.022) | μm |
| Outer diameter tolerance | h5 (0 / –0.015) | μm |
| Length tolerance | ±0.3 | mm |
| Retainer material | Synthetic resin | — |
| Max operating temperature | 80 | °C |
| Seal type | Standard UU seals (both ends) | — |
Features
- Low friction & high precision: Uses hardened steel balls for rolling contact, enabling smooth, high‑accuracy linear motion with minimal resistance.
- Uniform load distribution: 6‑row ball design ensures even stress distribution along the shaft, enhancing stability under high‑speed or repetitive operation.
- Standardized interchangeability: Strict dimensional tolerances allow direct interchange with other standard LM50‑series bushings.
- Sealed construction: UU‑type seals at both ends prevent dust ingress and retain lubrication, extending service life.
- Synthetic resin retainer: Lightweight, low‑noise, and provides stable ball guidance for consistent performance.
Notes
- Not designed for pure rotational or moment loads; use multiple bushings on a single shaft to resist moment loads.
- For temperatures exceeding 80°C, use the metal‑retainer variant (LM50GA).
- Lubrication with grease (e.g., THK AFB‑L) is recommended for optimal performance.
