THK SRG15 Linear Guide Block
The THK SRG15 is an ultra-high rigidity, compact heavy-duty linear guide featuring caged roller rolling elements. It delivers approximately twice the rigidity of conventional ball-type LM guides, making it ideal for space-constrained precision machinery requiring high stiffness and load capacity. Designed with 4-row, 45° contact angle geometry, it ensures equal load capacity in radial, reverse-radial, and lateral directions.
1. Product Overview
The THK SRG15 is an ultra-high rigidity, compact heavy-duty linear guide featuring caged roller rolling elements. It delivers approximately twice the rigidity of conventional ball-type LM guides, making it ideal for space-constrained precision machinery requiring high stiffness and load capacity. Designed with 4-row, 45° contact angle geometry, it ensures equal load capacity in radial, reverse-radial, and lateral directions. Equipped with a roller cage for smooth motion and long-term maintenance-free operation, it aligns with global standard dimensions (interchangeable with THK HSR series) for seamless integration.
2. Core Specifications
Basic Load Ratings
| Parameter | SRG15XA (Standard) | SRG15XV (Narrow) |
|---|---|---|
| Dynamic Load Rating (C) | 11.3 kN | 11.3 kN |
| Static Load Rating (C₀) | 25.8 kN | 25.8 kN |
| Permissible Moment (M₁/Roll) | 0.21 kN·m | 0.21 kN·m |
| Permissible Moment (M₂/Yaw) | 0.21 kN·m | 0.21 kN·m |
| Permissible Moment (M₃/Pitch) | 0.24 kN·m | 0.24 kN·m |
Block Dimensions (mm)
| Parameter | SRG15XA | SRG15XV |
|---|---|---|
| Height (M) | 24 | 24 |
| Width (W) | 47 | 34 |
| Length (L) | 69.2 | 69.2 |
| Mounting Hole | M5 x 10 | M4 x 8 |
| Weight | 1.24 kg | 1.24 kg |
Rail Specifications
- Rail Width: 24 mm
- Rail Height: 15 mm
- Standard Lengths: 160 to 3000 mm
- Weight: 4.6 kg/m
- Contact Angle: 45° (4-row)
- Standard Preload: C0 (Clearance), C1 (Slight), C2 (Medium)
- Operating Temperature: -20°C to 80°C
3. Key Features
- Ultra-High Rigidity: Rollers (length >1.5x diameter) deliver exceptional rigidity, double that 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 improves grease retention.
- Global Standard Dimensions: Direct interchangeability with THK HSR series (ISO 12090-1 compliant).
- Superior Sealing Options: End seals, side seals, LaCS scrapers, and FS fluorine seals available.
4. Standard Variants
- SRG15XA: Standard flange type (top/bottom mount, M5 mounting).
- SRG15XV: Narrow-width flange (space-saving, top-mount only, M4 mounting).
5. Typical Applications
- Compact precision machine tools & machining centers
- Small-scale industrial robots & automation systems
- Medical equipment & analytical instruments
- Semiconductor handling equipment
- Laser marking & 3D printing systems
- Injection molding & press machinery
