THK SRS5 Linear Guide
The THK SRS5 is the ultra-miniature, caged-ball linear guide in THK's SRS lineup, featuring a 2-row Gothic arch raceway structure engineered for extreme space constraints. It provides 4-way equal load capacity (radial, reverse-radial, and lateral) in an ultra-compact, lightweight form factor. The integrated ball retainer eliminates ball-to-ball friction, ensuring smooth, low-noise, low-dust operation with long-term maintenance-free performance.
THK SRS5 Linear Guide
Series: SRS (Miniature Caged Ball LM Guide)Standard Models: SRS5S (Short), SRS5M (Standard), SRS5N (Long), SRS5WM (Wide Standard)All specifications are strictly sourced from THK official technical documentation (EN-A01-154, SRS Series)
1. Product Overview
The THK SRS5 is the ultra-miniature, caged-ball linear guide in THK's SRS lineup, featuring a 2-row Gothic arch raceway structure engineered for extreme space constraints. It provides 4-way equal load capacity (radial, reverse-radial, and lateral) in an ultra-compact, lightweight form factor. The integrated ball retainer eliminates ball-to-ball friction, ensuring smooth, low-noise, low-dust operation with long-term maintenance-free performance. Constructed primarily from stainless steel, it offers excellent corrosion resistance. Its mounting dimensions are interchangeable with the legacy RSR5 series.
2. Core Specifications
Basic Load Ratings (SRS5M Standard Block)
| Parameter | Value |
|---|---|
| Dynamic Load Rating (C) | 0.439 kN |
| Static Load Rating (C₀) | 0.468 kN |
| Allowable Moment Loads (Single Block) | Mx=0.54 N·m, My=0.49 N·m, Mz=1.07 N·m |
| Max Rail Length | 1000 mm |
| Standard Rail Lengths | 18 – 1000 mm (5 mm increments) |
Block Dimensions (mm)
| Parameter | SRS5S (Short) | SRS5M (Standard) | SRS5N (Long) |
|---|---|---|---|
| Height (M) | 6 | 6 | 6 |
| Width (W) | 12 | 12 | 12 |
| Length (L) | 14.2 | 19.4 | 24.6 |
| Mounting Hole | M2 x 2.5 | M2 x 2.5 | M2 x 2.5 |
| Mounting Pitch (F) | 10 | 15 | 20 |
| Weight | 0.012 kg | 0.016 kg | 0.020 kg |
Rail Specifications (mm)
| Parameter | Value |
|---|---|
| Rail Width (W1) | 5 |
| Rail Height (H) | 3 |
| Mounting Hole Pitch | 10 mm (M1.6 tapped) |
| Weight | 0.14 kg/m |
| Number of Races | 2 rows |
| Contact Structure | Gothic arch (4-way equal load) |
| Standard Preload | C0 (Clearance), C1 (Slight) |
| Operating Temperature | -20°C to 80°C |
| Standard Lubrication | THK AFF Grease |
| Material | Stainless Steel (standard) |
| Accuracy Classes | Normal (standard), P (Precision) |
3. Key Features (THK Official)
- Ultra-Compact & Lightweight: The smallest caged-ball LM guide from THK, ideal for micro-precision equipment.
- 4-Way Equal Load: Balanced capacity in all directions for versatile, single-rail moment resistance.
- Ball Retainer (Cage): Eliminates ball collision, reduces noise, and maintains lubrication for low dust.
- Maintenance-Free: Sealed design with long-life grease for extended service intervals.
- Corrosion Resistant: Full stainless steel construction for harsh or cleanroom environments.
- High Precision: Ground raceways ensure stable, sub-micron level positioning accuracy.
- Interchangeable: Direct replacement for THK RSR5 series.
4. Standard Variants
- SRS5S: Short block (length 14.2 mm), top mounting, stainless steel.
- SRS5M: Standard block (length 19.4 mm), most common model.
- SRS5N: Long block (length 24.6 mm) for higher load/rigidity.
- SRS5WM: Wide rail variant (rail width 8 mm) for increased moment rigidity.
- SRS5GM: With enhanced side seals (UU/SS) for superior dust protection.
5. Typical Applications
- Medical Devices: Portable diagnostic tools, micro-pumps, endoscopy equipment.
- Semiconductor Equipment: Wafer probe stations, micro-handling, optical inspection.
- Precision Instruments: Microscopes, miniature stages, laboratory automation.
- Consumer Electronics: Camera auto-focus, smartphone mechanisms, optical drives.
- Robotics: Micro-robotic arms, wearable devices, precision actuators.
- Optical Equipment: Laser positioning, fiber alignment, lens assemblies.
