THK SR30 Linear Guide
The THK SR30 is a compact, low-profile radial load linear guide featuring a 4-row, 90° contact angle ball raceway structureTHK. Optimized for horizontal guidance applications, it delivers exceptional radial load capacity and high rigidity in a space-saving designTHK. Equipped with precision-ground raceways and a self-aligning capability, it easily absorbs installation errors while maintaining stable, high-precision motion.
1. Product Overview
The THK SR30 is a compact, low-profile radial load linear guide featuring a 4-row, 90° contact angle ball raceway structure. Optimized for horizontal guidance applications, it delivers exceptional radial load capacity and high rigidity in a space-saving design. Equipped with precision-ground raceways and a self-aligning capability, it easily absorbs installation errors while maintaining stable, high-precision motion. The ball retainer prevents steel balls from falling out when the block is separated from the rail, enhancing assembly convenience.
2. Core Specifications
Basic Load Ratings
| Parameter | SR30W (Standard) | SR30V (Short) |
|---|---|---|
| Dynamic Load Rating (C) | 40.9 kN | 29.5 kN |
| Static Load Rating (C₀) | 64.4 kN | 34.4 kN |
Block Dimensions (mm)
| Parameter | SR30W | SR30V |
|---|---|---|
| Height (M) | 42 | 42 |
| Width (W) | 60 | 60 |
| Length (L) | 91.6 | 67.9 |
| Mounting Hole | M8 x 12 | M8 x 12 |
| Mounting Pitch (F) | 60 | 40 |
| Weight | 2.1 kg | 1.5 kg |
Rail Specifications
- Rail Width: 28 mm
- Rail Height: 24 mm
- Standard Lengths: 220–3000 mm
- Weight: 7.2 kg/m
- Number of Races: 4 rows
- Contact Angle: 90° (Radial)
- Standard Preload: C0 (Clearance), C1 (Slight), C2 (Medium)
- Operating Temperature: -20°C to 80°C
- Material: Bearing steel (standard), Stainless steel (WM/VM variants)
3. Key Features
- Compact & Low Profile: Optimized height design for space-constrained installations.
- Superior Radial Load: 90° contact angle maximizes load capacity in vertical (radial) direction.
- Self-Aligning Capability: Absorbs parallelism errors between axes for stable precision.
- Ball Retainer System: Prevents ball drop-out during assembly/maintenance.
- Smooth & Quiet Motion: Optimized end cap design for silent ball circulation.
- High Durability: Minimizes differential slip, extending wear life and accuracy.
- Corrosion-Resistant Options: WM/VM models offer stainless steel construction.
4. Standard Variants
- SR30W: Standard block, top mounting, bearing steel.
- SR30WM: Standard block, stainless steel (corrosion-resistant).
- SR30V: Short block (space-saving), top mounting.
- SR30VM: Short block, stainless steel.
- SR30TB/TBM: Flange type, bottom mounting (for vertical applications).
5. Typical Applications
- Horizontal machining centers & CNC lathes
- Semiconductor manufacturing equipment
- Precision measuring instruments
- Automation & robotic systems
- Packaging & printing machinery
- Medical diagnostic equipment
