THK SRS12S Linear Guide
The THK SRS12S is a compact, short-block miniature linear guide featuring a 2-row, dual-raceway structure with ball retainers. Designed for space-constrained precision applications, it delivers 4-way equal load capacity (radial, reverse-radial, and lateral) in a low-profile, lightweight package. The ball retainer system eliminates inter-ball friction, enabling smooth, low-noise motion with long-term maintenance-free operation and low dust generation.
1. Product Overview
The THK SRS12S is a compact, short-block miniature linear guide featuring a 2-row, dual-raceway structure with ball retainers. Designed for space-constrained precision applications, it delivers 4-way equal load capacity (radial, reverse-radial, and lateral) in a low-profile, lightweight package. The ball retainer system eliminates inter-ball friction, enabling smooth, low-noise motion with long-term maintenance-free operation and low dust generation. The block incorporates resin components via insert molding, further reducing inertia for high-speed automation tasks.
2. Core Specifications
Basic Load Ratings
| Parameter | Value |
|---|---|
| Dynamic Load Rating (C, Radial) | 2.70 kN |
| Static Load Rating (C₀, Radial) | 2.10 kN |
| Allowable Moment Loads (Single Block) | Mx=4.62 N·m, My=4.17 N·m, Mz=11.0 N·m |
| Max Rail Length | 2000 mm |
| Standard Rail Lengths | 55–2000 mm (increments of 50 mm) |
Block Dimensions (mm)
| Parameter | SRS12S |
|---|---|
| Height (M) | 13 |
| Width (W) | 27 |
| Total Length (L) | 25 |
| Mounting Hole Thread (d₁) | M3 × 3.2 |
| Mounting Pitch (F) | 20 |
| Bolt Hole Depth (h) | 11 |
| Head Height (H3) | 3 |
| Width Across Bolts (W2) | 2 |
| Weight | 0.30 kg |
Rail Specifications (mm)
| Parameter | Value |
|---|---|
| Rail Width (W1) | 6 |
| Rail Height (H) | 4.5 |
| Pitch (S) | 3.5 |
| Weight | 0.65 kg/m |
| Mounting Hole Pattern | 2×M3 (tapped) |
| Mounting Pitch | 25 mm |
| Material | Stainless Steel (standard) |
| Preload Class | C0 (Standard Clearance), C1 (Slight Preload) |
| Mounting Torque (M2 Bolts) | ≤ 0.4 N·m |
3. Key Features
- 4-Way Equal Load: Balanced load distribution across radial, reverse-radial, and lateral directions for versatile positioning.
- Ball Retainer System: Eliminates inter-ball friction, reduces noise, and enhances lubricant retention for low-dust operation.
- Compact & Lightweight: Low-profile rail (4.5 mm height) and short block (25 mm length) minimize space and inertia.
- Maintenance-Free: Sealed design with long-life grease for extended operation without relubrication.
- High Precision: Gothic-arch groove structure ensures stable accuracy; recommended for mounting surfaces with flatness ≤ 0.050/200 mm.
- Corrosion-Resistant: Stainless steel construction for harsh environments.
4. Standard Variants
- SRS12S: Standard short block, top-mounted, stainless steel.
- SRS12GS: Stainless steel short block with alternative end seals (for enhanced dust protection).
- SRS12M: Long-block variant (34.4 mm length) for longer stroke applications.
- SRS12N: Extra-long block (47.1 mm length) for increased load capacity.
5. Typical Applications
- Medical Devices: Diagnostic equipment, sample handling systems.
- Semiconductor Tools: Wafer handlers, inspection machinery.
- Automation: Compact actuators, robotic end-effectors.
- Consumer Electronics: High-precision stages, camera lens drives.
- Laboratory Instruments: Microscopy stages, liquid handling robots.
