NSK RAA25GMK6Z Roller Linear Guide
The NSK RAA25GMK6Z is a high-performance, flanged long-type roller linear guide from the RA series, engineered for heavy-duty, high-precision machinery. Featuring a 4-row roller circuit design, it delivers equal load capacity & rigidity in 4 directions (radial, reverse-radial, lateral) with superior rigidity vs. ball-type guides. Integrated NSK K1™ lubrication system ensures long-term, low-maintenance operation.
1. Product Overview
The NSK RAA25GMK6Z is a high-performance, flanged long-type roller linear guide from the RA series, engineered for heavy-duty, high-precision machinery. Featuring a 4-row roller circuit design, it delivers equal load capacity & rigidity in 4 directions (radial, reverse-radial, lateral) with superior rigidity vs. ball-type guides. Integrated NSK K1™ lubrication system ensures long-term, low-maintenance operation. Optimized for machine tools, injection molding machines, and heavy automation requiring ultra-high stiffness, accuracy, and load capacity.
2. Core Official Specifications (NSK RA Series Catalog E3334C)
2.1 Dimensional Parameters (mm)
| Parameter | Value |
|---|---|
| Rail Width (W1) | 23 |
| Rail Height (H1) | 24 |
| Assembly Height (H) | 36 |
| Slider Width (W) | 70 |
| Slider Length (L) | 115.5 |
| Slider Mounting Hole Pitch (B×C) | 65.5×57 |
| Slider Mounting Hole | M6×1×10 (depth) |
| Rail Hole Pitch (F) | 30 |
| Rail Mounting Hole | 7×11×9 |
| Standard Rail Length | 100–3000 mm (customizable) |
2.2 Load & Performance Ratings
- Basic Dynamic Load Rating (C): 45.3 kN
- Basic Static Load Rating (C₀): 112.0 kN
- Static Moment Ratings (Mr0/Mp0/My0): 970 / 760 / 760 Nm
- Material: High-carbon chrome bearing steel (NSK standard)
- Accuracy Grade: P6 (Precision)
- Preload: Standard (Z)
- Operating Temperature: -20°C to +80°C
- Slider Weight: 0.989 kg
- Max. Travel Speed: Up to 2 m/s
- Lubrication: NSK K1™ lubrication unit (K6)
- Seal Configuration: Standard end seals + side seals
3. Key Official Features
- 4-Way Equal Load: 4-row roller design provides uniform rigidity & load capacity in all directions.
- Ultra-High Rigidity: Roller elements deliver ~2–3x higher rigidity than ball guides of equivalent size.
- K1™ Self-Lubrication: Integrated NSK K1 system enables 5-year / 10,000 km maintenance-free operation.
- Low Vibration: Optimized roller recirculation minimizes passage vibration for smooth, quiet motion.
- Flanged Long Carriage: GM type offers enhanced moment rigidity & stability for heavy-duty setups.
- Interchangeability: Rails & sliders are interchangeable (P6 grade) for flexible assembly & inventory.
- Dust Resistance: Standard multi-labyrinth seals prevent contaminant ingress.
- High Precision: P6 accuracy grade ensures tight dimensional tolerances & positioning accuracy.
4. Applications
Ideal for: CNC machine tools, machining centers, injection molding machines, press machines, heavy industrial robots, precision measuring equipment, and large automation systems requiring maximum rigidity, load capacity, and long-term reliability.
