IKO ST253745 Linear Bushing
The IKO ST253745 is a precision Stroke Rotary Bushing from the IKO ST Series, engineered to enable both linear reciprocation and rotational motion simultaneously on a single shaft. Featuring an ultra-compact, thin-walled design with minimal sectional height, it delivers exceptionally smooth, low-friction movement and high positional accuracy.
The IKO ST253745 is a precision Stroke Rotary Bushing from the IKO ST Series, engineered to enable both linear reciprocation and rotational motion simultaneously on a single shaft. Featuring an ultra-compact, thin-walled design with minimal sectional height, it delivers exceptionally smooth, low-friction movement and high positional accuracy. Ideal for use in precision instruments, semiconductor manufacturing equipment, measuring devices, and other compact machinery requiring dual linear and rotary functionality.
Official Specifications
| Parameter | Value | Unit |
|---|---|---|
| Bore Diameter (d) | 25 | mm |
| Outer Diameter (D) | 37 | mm |
| Overall Length (L) | 45 | mm |
| Basic Dynamic Load Rating (C) | 1450 | N |
| Basic Static Load Rating (C₀) | 1430 | N |
| Mass | 0.117 | kg |
| Maximum Stroke Length | 54 | mm |
| Retainer Material | Synthetic Resin | — |
| Outer Sleeve / Ball Material | High Carbon Chromium Steel (SUJ2) | — |
| Operating Temperature Range | -10°C to +120°C (100°C continuous) | °C |
| Preload | Zero or Minimal Preload | — |
| Type | Closed (Non-Open) | — |
| Self-Aligning | No | — |
| Standard Lubrication | Pre-lubricated | — |
Key Features (Official Description)
- Dual Linear & Rotary Motion: Uniquely designed to perform smooth linear stroke and 360° rotation concurrently on a single shaft.
- Ultra-Compact Design: Utilizes small-diameter steel balls within a thin-walled outer ring for an extremely low sectional height, ideal for space-constrained assemblies.
- High Precision & Smoothness: Precision-ground components and minimal preload ensure extremely accurate, stable movement with very low frictional resistance.
- Lightweight & Low Inertia: High-rigidity, lightweight resin retainer minimizes inertial forces, suitable for high-speed operation.
- High Durability: Constructed from hardened high-carbon chromium bearing steel (SUJ2) for excellent wear resistance and long service life.
Official Notes
- ST253745UU variant is available with double seals for enhanced dust protection and lubrication retention.
- Recommended shaft: Surface hardness of 60–64 HRC and surface roughness of Ra ≤ 0.8 μm.
- For continuous duty, do not exceed 100°C to maintain material integrity.
- Compatible with standard precision shafts; ensure proper alignment for optimal performance.
- Suitable for moderate load applications requiring combined linear and rotational guidance.
