THK SR35 Linear Guide
The THK SR35 is a high-rigidity, radial-load optimized linear guide featuring a 4-row, 90° contact angle ball raceway structureTHK. Engineered for heavy-duty horizontal guidance applications, it delivers exceptional radial load capacity and rigidity in a compact, low-profile design. The self-aligning block geometry effectively absorbs installation errors, while the integrated ball retainer prevents ball loss during assembly or maintenance.
The THK SR35 is a high-rigidity, radial-load optimized linear guide featuring a 4-row, 90° contact angle ball raceway structure. Engineered for heavy-duty horizontal guidance applications, it delivers exceptional radial load capacity and rigidity in a compact, low-profile design. The self-aligning block geometry effectively absorbs installation errors, while the integrated ball retainer prevents ball loss during assembly or maintenance. Precision-ground raceways ensure smooth, stable, and high-precision linear motion for demanding industrial environments.
2. Core Specifications (THK Official)
Basic Load Ratings
| Parameter | SR35W (Standard) | SR35V (Short) |
|---|---|---|
| Dynamic Load Rating (C) | 60.4 kN | 46.7 kN |
| Static Load Rating (C₀) | 81.8 kN | 60.1 kN |
Block Dimensions (mm)
| Parameter | SR35W | SR35V |
|---|---|---|
| Height (M) | 48 | 48 |
| Width (W) | 70 | 70 |
| Length (L) | 111 | 77.6 |
| Mounting Hole | M8 x 12 | M8 x 12 |
| Mounting Pitch (F) | 79 | 45.7 |
| Weight | 3.2 kg | 2.4 kg |
Rail Specifications
- Rail Width (W1): 34 mm
- Rail Height (H): 28 mm
- Standard Lengths: 220 – 3000 mm
- Weight: 10.2 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
- Lubrication: B-M6F grease nipple
- Material: Bearing steel (standard), Stainless steel (WM/VM variants)
3. Key Features
- Superior Radial Load Performance: 90° contact angle design maximizes load capacity and rigidity in the vertical (radial) direction.
- Self-Aligning Capability: Automatically compensates for mounting surface errors, ensuring stable precision.
- Ball Retainer System: Secures balls in place when the block is removed from the rail, simplifying handling.
- Smooth & Quiet Operation: Optimized end-cap design for silent ball circulation and minimal friction.
- High Durability: Minimizes differential slip between balls, extending wear life and maintaining accuracy.
- Corrosion-Resistant Option: WM/VM models offer stainless steel construction for harsh environments.
- Compact & Low Profile: Space-saving design ideal for equipment with height constraints.
4. Standard Variants
- SR35W: Standard block, top mounting, bearing steel.
- SR35WM: Standard block, stainless steel (corrosion-resistant).
- SR35V: Short block (space-saving), top mounting.
- SR35VM: Short block, stainless steel.
- SR35TB/TBM: Flange type, bottom mounting (for vertical applications).
5. Typical Applications
- Heavy-duty CNC machine tools & machining centers
- Industrial automation & robotic systems
- Precision measuring instruments
- Packaging & printing machinery
- Semiconductor manufacturing equipment
- Medical diagnostic & surgical devices
