THK SRG55 Linear Guide
The THK SRG55 is an ultra-high rigidity, ultra-heavy load linear guide utilizing caged rollers as rolling elements. It delivers approximately twice the rigidity of conventional ball-type LM guides, designed for heavy-duty precision machinery demanding exceptional stiffness and load capacity. Featuring a 4-row, 45° contact angle structure, it provides equal load capacity in radial, reverse-radial, and both lateral directions.
The THK SRG55 is an ultra-high rigidity, ultra-heavy load linear guide utilizing caged rollers as rolling elements. It delivers approximately twice the rigidity of conventional ball-type LM guides, designed for heavy-duty precision machinery demanding exceptional stiffness and load capacity. Featuring a 4-row, 45° contact angle structure, it provides equal load capacity in radial, reverse-radial, and both lateral directions. The integrated roller cage ensures smooth, stable motion and long-term maintenance-free operation, with global standard dimensions interchangeable with THK HSR series.THK
2. Core Specifications
Basic Load Ratings
| Parameter | SRG55R (Standard) | SRG55LR (Long) |
|---|---|---|
| Dynamic Load Rating (C) | 131 kN | 174 kN |
| Static Load Rating (C₀) | 266 kN | 355 kN |
| Permissible Moment (MA/Roll) | 5.82 kN·m | 7.73 kN·m |
| Permissible Moment (MB/Yaw) | 5.82 kN·m | 7.73 kN·m |
| Permissible Moment (MC/Pitch) | 8.19 kN·m | 10.9 kN·m |
Block Dimensions (mm)
| Parameter | SRG55R | SRG55LR |
|---|---|---|
| Height (M) | 80 | 80 |
| Width (W) | 100 | 100 |
| Length (L) | 185 | 235 |
| Mounting Hole | M12 x 18 | M12 x 18 |
| Weight | 5.0 kg | 6.4 kg |
Rail Specifications
- Rail Width (W1): 53 mm
- Rail Height (H): 30 mm
- Standard Lengths: 200 to 3060 mm
- Weight: 15.8 kg/m
- Contact Angle: 45° (4-row)
- Standard Preload: C0 (Clearance), C1 (Slight), C2 (Medium)
- Operating Temperature: -20°C to 80°C
- Lubrication: B-PT1/8 grease nipple
3. Key Features (THK Official)
- Ultra-High Rigidity: Rollers with length >1.5x diameter provide double the rigidity of ball-type guides.
- 4-Way Equal Load: Uniform load capacity in all four directions (radial, reverse-radial, lateral).
- Smooth & Stable Motion: Roller cage prevents roller skewing, minimizing friction fluctuation.
- Long-Term Maintenance-Free: Eliminates roller-to-roller friction and enhances grease retention.
- Global Standard Dimensions: Direct interchangeability with THK HSR series (ISO 12090-1 compliant).
- Superior Sealing: Equipped with end seals, side seals, LaCS scrapers, and FS fluorine seals.
4. Standard Variants
- SRG55R: Standard block type (mount from side).
- SRG55LR: Long block type (higher load/rigidity, extended length).
- SRG55SLR: Super-long block type (maximum load/rigidity).
5. Typical Applications
- Large-scale precision machine tools & machining centers
- Heavy-duty industrial robots & automation systems
- Press machinery & injection molding machines
- Large measuring instruments & semiconductor manufacturing equipment
- Construction machinery & high-load precision stages
