NSK Linear Guide LAW21ELZ
The NSK LAW21ELZ is a compact, wide-profile linear guide with a flanged-type slide block, engineered specifically for single-rail applications demanding high rolling moment rigidity and low-profile installation. Featuring NSK's offset Gothic arch ball groove (50° contact angle) and four-row ball configuration, it delivers exceptional vertical load capacity, impact resistance, and stability. The "Z" suffix denotes standard preload (Z1/Slight), ensuring high rigidity and precision.
1. Product Overview
The NSK LAW21ELZ is a compact, wide-profile linear guide with a flanged-type slide block, engineered specifically for single-rail applications demanding high rolling moment rigidity and low-profile installation. Featuring NSK's offset Gothic arch ball groove (50° contact angle) and four-row ball configuration, it delivers exceptional vertical load capacity, impact resistance, and stability. The "Z" suffix denotes standard preload (Z1/Slight), ensuring high rigidity and precision. Fully interchangeable rails/slides enable flexible assembly and fast delivery.
2. Key Dimensions (mm, Official)
| Parameter | Value |
|---|---|
| Nominal Rail Size | 21 |
| Assembly Height (H) | 18 |
| Rail Height (H1) | 10.5 |
| Rail Width (W1) | 37 |
| Slide Block Length (L) | 58.8 |
| Slide Block Width (W) | 68 |
| Slide Mounting Hole Pitch (L1×W1) | 60 × 29 |
| Slide Mounting Hole | M5 × 0.8 × 8 |
| Rail Mounting Hole Pitch | 50 |
| Rail Mounting Hole Size | 4.5 × 7.5 × 5.3 |
| Lubrication Port | — (Standard; K1-L Option Available) |
| Approx. Slide Weight | 0.3 kg |
3. Load Ratings (N, Official)
| Rating Type | Value |
|---|---|
| Basic Dynamic Load Rating (C) | 5,150 |
| Basic Static Load Rating (C₀) | 13,900 |
| Basic Static Moment (My₀) | 196 N·m |
| Basic Static Moment (Mr₀) | 433 N·m |
4. Performance Specifications (Official)
- Preload (Standard): Z1 (ZZ) – Slight Preload
- Preload Options: Z0 (Clearance), Z1 (Standard), Z3 (Medium, Not Available for 21)
- Max. Allowable Speed: 150 m/min (2.5 m/s)
- Operating Temperature: -10°C to +80°C
- Accuracy Grades: PN (Normal), P6, P5
- Material: High-Carbon Chromium Steel (Standard)
- Sealing: Dual End Seals + Side Seals + Bottom Seals (Standard)
- Ball Retention: Retainer-equipped; Balls do not fall out when slide is removed
- Lubrication: Standard relubrication; Optional NSK K1-L™ Maintenance-Free Unit
5. Core Features & Benefits (Official)
- Single-Rail Superiority: Wide rail design provides exceptional rigidity against rolling moments.
- 50° Contact Angle: Optimized for high vertical load capacity and rigidity.
- Four-Row Offset Grooves: Absorbs high impacts and ensures four-way equal load capability.
- Low-Profile Compactness: Ideal for space-constrained, precision equipment.
- Self-Aligning & Interchangeable: Absorbs mounting errors; random-match rails/slides.
- Low Noise & Smooth Motion: Refined ball recirculation path.
- Maintenance-Free Option: K1-L lubrication extends service intervals.
6. Typical Applications
Ideal for semiconductor manufacturing equipment, precision measuring instruments, LCD panel assembly lines, single-axis robots, automated pick-and-place systems, medical devices, printing machinery, and compact automation requiring wide, stable, low-profile linear motion.
