IKO OR 6820 A/M3 Linear Ball Bushing
The OR 6820 A/M3 is a high‑precision closed‑type linear ball bushing from IKO's OR series. It features a precision‑ground outer sleeve, steel retainer, and multi‑row steel balls, delivering ultra‑smooth, low‑friction linear motion with excellent radial load capacity. The M3 suffix indicates integrated M3 mounting holes for secure installation. It is widely used in semiconductor equipment, precision measuring instruments, and miniature automation systems requiring compact size and high accuracy.
The OR 6820 A/M3 is a high‑precision closed‑type linear ball bushing from IKO’s OR series. It features a precision‑ground outer sleeve, steel retainer, and multi‑row steel balls, delivering ultra‑smooth, low‑friction linear motion with excellent radial load capacity. The M3 suffix indicates integrated M3 mounting holes for secure installation. It is widely used in semiconductor equipment, precision measuring instruments, and miniature automation systems requiring compact size and high accuracy.
Official Specifications
| Parameter | Value | Unit |
|---|---|---|
| Inner bore diameter (dr) | 6 | mm |
| Outer diameter (D) | 8 | mm |
| Overall length (L) | 20 | mm |
| Number of ball rows | 4 | — |
| Basic dynamic load rating (C) | 245 | N |
| Basic static load rating (C₀) | 392 | N |
| Mass | 2.3 | g |
| Bore diameter tolerance (High grade) | 0 / –0.005 | mm |
| Outer diameter tolerance (High grade) | 0 / –0.012 | mm |
| Length tolerance | ±0.15 | mm |
| Max eccentricity | 12 | μm |
| Radial clearance (High grade) | –5 | μm |
| Retainer material | Steel | — |
| Outer sleeve material | High‑carbon chromium bearing steel (SUJ2) | — |
| Ball material | Hardened steel | — |
| Operating temperature range | –10°C to +80°C | °C |
| Mounting thread | M3 (2 holes) | — |
| Lubrication | Pre‑lubricated with rust‑preventive oil; lithium‑based grease recommended | — |
Key Features (Official Description)
- Compact & High‑precision: Miniature size with strict dimensional tolerances for ultra‑smooth linear motion.
- Steel retainer: High rigidity and stable ball guidance, suitable for high‑speed operation.
- Integrated M3 mounting: Convenient and secure installation without additional fixtures.
- Multi‑row ball design: Enhanced radial load capacity and running stability.
- Standard dimensions: Fully interchangeable with IKO OR‑series shafts and miniature linear motion systems.
Official Notes
- Designed exclusively for linear motion; not for pure rotational or moment loads.
- Recommended lubrication: IKO AFB‑L grease or equivalent lithium‑based grease.
- Shaft requirements: Surface hardness ≥58 HRC, surface roughness Ra ≤0.4 μm.
- Operating temperature must not exceed 80°C to ensure performance and service life.
