THK LM38GA Linear Bushing
The LM38GA is a standard‑type linear ball bushing from THK’s LM‑GA series, featuring a metal retainer for enhanced high‑temperature and heavy‑duty performance. It enables infinite linear motion with low friction and high precision, utilizing 6 rows of recirculating steel balls for stable radial load support. Designed for industrial automation, precision machinery, and high‑temperature environments, it comes with a standard lubrication hole for easy maintenance.
The LM38GA is a standard‑type linear ball bushing from THK’s LM‑GA series, featuring a metal retainer for enhanced high‑temperature and heavy‑duty performance. It enables infinite linear motion with low friction and high precision, utilizing 6 rows of recirculating steel balls for stable radial load support. Designed for industrial automation, precision machinery, and high‑temperature environments, it comes with a standard lubrication hole for easy maintenance.
Official Specifications
| Parameter | Value | Unit |
|---|---|---|
| Inscribed bore diameter (dr) | 38 | mm |
| Outer diameter (D) | 57 | mm |
| Overall length (L) | 76 | mm |
| Number of ball rows | 6 | — |
| Basic dynamic load rating (C) | 2,160 | N |
| Basic static load rating (C₀) | 4,020 | N |
| Mass | 590 | g |
| Bore diameter tolerance (High grade) | 0 / –0.012 | mm |
| Outer diameter tolerance (High grade) | 0 / –0.019 | mm |
| Length tolerance | ±0.3 | mm |
| Max eccentricity | 13 | μm |
| Radial clearance tolerance (High grade) | –13 | μm |
| Retainer material | Metal | — |
| Outer sleeve material | High‑carbon chromium bearing steel | — |
| Ball material | Hardened steel | — |
| Operating temperature range | –15°C to +120°C | °C |
| Lubrication hole (d₀) | 3 | mm |
| Seal type | None (standard; UU seals optional) | — |
Key Features
- Metal retainer construction: Delivers superior heat resistance (up to 120°C) and durability compared to resin‑retainer models, suitable for harsh operating conditions.
- 6‑row ball design: Ensures uniform load distribution, smooth motion, and high rigidity under radial loads.
- Standard lubrication hole: Facilitates easy grease replenishment for extended service life.
- High precision tolerances: Strict dimensional accuracy guarantees stable performance and interchangeability with standard LM series bushings.
- Flange‑less design: Compact and versatile for space‑constrained installations.
Official Notes
- Not intended for pure rotational or moment loads; use two or more bushings on a single shaft with sufficient spacing to resist moment loads.
- For applications requiring dust protection, specify the sealed variant (LM38GAUU), with a maximum operating temperature of 80°C.
- Recommended lubrication: THK AFB‑L grease or equivalent.
