THK SHW12CRM Wide-Rail LM Guide Block
The THK SHW12CRM is a compact, wide-rail type linear motion guide from THK's SHW series (CR/CRM/HRM lineup). It features a low-profile, low-center-of-gravity design, 4-way equal load capacity, caged-ball technology, and top-mount tapped holes, delivering high rigidity, smooth motion, and long-term maintenance-free performance for precision, space-constrained applications.
The THK SHW12CRM is a compact, wide-rail type linear motion guide from THK's SHW series (CR/CRM/HRM lineup). It features a low-profile, low-center-of-gravity design, 4-way equal load capacity, caged-ball technology, and top-mount tapped holes, delivering high rigidity, smooth motion, and long-term maintenance-free performance for precision, space-constrained applications.
Official Specifications
1. LM Block Dimensions (SHW12CRM)
| Parameter | Value (CRM Type) |
|---|---|
| Model Number | SHW12CRM (Top-mount tapped hole type) |
| Block Height (M) | 12 mm |
| Block Width (W) | 30 mm |
| Block Length (L) | 37 mm |
| Mounting Bolt Size | M3 × 3.5 (4 holes) |
| Bolt Pitch (F) | 27 mm |
| Number of Mounting Holes | 4 |
| Standard Seal | UU (Non-contact side seal) |
| Grease Nipple | None (Standard) |
| Material | High-carbon chromium bearing steel (Rail/Balls), Cast Iron (Block) |
| Operating Temperature | -15°C to +80°C |
2. Rail Specifications (SHW12 Series)
| Parameter | Value |
|---|---|
| Rail Height (H3) | 12 mm |
| Rail Width (W1) | 21 mm |
| Number of Ball Rows | 4 rows (2 rows per side) |
| Contact Angle | 45° (4-way equal load) |
| Precision Grade | Normal (Standard), H, P, SP available |
| Preload Options | Normal (no symbol), Light preload (C1) |
3. Load & Performance Ratings
| Parameter | Value |
|---|---|
| Basic Dynamic Load Rating (C) | 4.31 kN |
| Basic Static Load Rating (C0) | 5.66 kN |
| Static Permissible Moment (Ma) | 0.0228 kN·m |
| Static Permissible Moment (Mb) | 0.0228 kN·m |
| Static Permissible Moment (Mc) | 0.0405 kN·m |
| Net Weight (Block only) | Approx. 0.08 kg |
| Rail Weight | Approx. 0.8 kg/m |
Key Features
- Wide, Low-Profile & Low Center of GravityThe wide rail and low-height design provide superior rigidity and high Mc moment resistance in a compact footprint, ideal for single-axis, space-saving setups.
- 4-Way Equal Load Capacity45° contact angle delivers identical load ratings in radial, reverse-radial, and lateral directions, enabling universal mounting in any orientationTHK.
- Caged Ball TechnologyIntegrated ball cages eliminate metal-to-metal ball friction, ensuring low noise, high-speed travel, excellent lubricant retention, and long-term maintenance-free operation.
- Self-Adjusting (Auto-Aligning) CapabilityTHK’s proprietary DF circular-arc groove configuration absorbs mounting surface errors while maintaining smooth, backlash-free motion under preload.
- Top-Mount Tapped Holes (CRM Type)Features internal tapped holes for top-surface mounting, offering flexible installation for compact equipment designs.
- Low Dust GenerationBall cages reduce particle emission, making it suitable for clean environment and precision instrument applications.
Typical Applications
- Precision measuring equipment
- Semiconductor / FPD manufacturing machinery
- Optical alignment & inspection systems
- Compact automation modules
- Medical diagnostic devices
- Robotics & miniature positioning stages
- Office automation equipment
