THK NSR20TBC Self-Aligning LM Guide (Linear Guide Block)
The THK NSR20TBC is a unique, self-aligning linear motion (LM) guide block from THK's NSR-TBC series. It features a two-piece cast iron casing with a 120° cylindrical spline nut mechanism, enabling exceptional self-alignment capability for forgiving installation and stable performance.
The THK NSR20TBC is a unique, self-aligning linear motion (LM) guide block from THK's NSR-TBC series. It features a two-piece cast iron casing with a 120° cylindrical spline nut mechanism, enabling exceptional self-alignment capability for forgiving installation and stable performance.
Official Specifications (NSR20TBC Block)
| Parameter | Value |
|---|---|
| Model Number | NSR20TBC |
| Type | Self-Aligning LM Guide Block (Two-piece casing) |
| Rail Height (Nominal) | 20 mm |
| Block Height (M) | 40 mm |
| Block Width (W) | 70 mm |
| Block Length (L) | 67 mm |
| Number of Ball Rows | 4 rows (2 rows per side) |
| Basic Dynamic Load Rating (C) | 9.41 kN |
| Basic Static Load Rating (C0) | 18.6 kN |
| Static Permissible Moment (Ma) | 0.31 kN·m |
| Static Permissible Moment (Mb) | 0.27 kN·m |
| Material | Cast Iron (Casing), High-carbon chromium bearing steel (Rail/Ball) |
| Net Weight (Block) | Approx. 0.62 kg |
| Lubrication | Standard grease nipple (A-M6F) |
| Operating Temperature | Standard range: -15°C to +80°C |
Key Features (from THK Official)
- Exclusive Two-Piece Self-Aligning StructureThe only THK LM guide with a split casing. The 120° cut cylindrical spline nut allows the block to self-align with the rail, drastically reducing required mounting accuracy and absorbing installation errors.
- Four-Way Equal Load CapacityFour rows of precision balls bear loads equally in radial, reverse-radial, and both lateral directions, making it suitable for complex force applications. Note: Moment loads (Mc) are not recommended for single-rail setups.
- Rigid Cast Iron ConstructionHigh rigidity cast iron casing provides excellent damping, vibration resistance, and stability for heavy-duty machining tools and precision equipment.
- Easy InstallationThe self-adjusting mechanism eliminates the need for high-precision rail parallelism, simplifying assembly and reducing setup time.
- Standardized MountingFeatures bottom-mounted bolt holes for straightforward installation into various machine frames.
Typical Applications
- Machine tools (milling machines, lathes)
- Precision measuring equipment
- Industrial automation machinery
- Packaging and printing machines
- General industrial machinery requiring robust linear motion
