Description
The XL4 jaw shaft coupling is designed for compact power transmission applications requiring vibration damping and misalignment compensation. It features precision-machined 45 carbon steel hubs combined with a high-elastic polyurethane spider, ensuring stable torque transfer and reduced shock loads. With a 78mm outer diameter and an overall length of 114mm, this coupling is ideal for CNC machines, servo motor systems, and light-duty industrial automation equipment.
Key Features
- Precision machined 45 carbon steel hubs
- High-elastic polyurethane spider for vibration damping and shock absorption
- Compensates for angular, radial, and axial misalignment
- Bore tolerance H7 for precise shaft fit
- Compact structure for space-limited installations
- Suitable for high-speed rotation up to 9,500 RPM
- Operating temperature range: -35°C to 80°C
⚠ Important Notice – Blind Bore Version
This product is supplied with an unmachined blind bore.
The coupling hub is delivered as a semi-finished component. Final bore machining, drilling, and keyway processing must be completed by the customer after receiving the product. Please ensure you have suitable machining capabilities before placing an order. Blind bore products are not eligible for return due to machining-related issues.
Technical Specifications
| Model | XL4 |
| Coupling Type | Jaw Coupling (Spider Coupling) |
| Outer Diameter (D) | 78 mm |
| Overall Length (L0) | 114 mm |
| Bore Diameter Range | 12 – 38 mm / 40 – 48 mm |
| Hub Pilot Diameter (D1, D2) | 66 mm / 78 mm |
| Single Bore Length (L) | 45 mm |
| Rated Torque | 380 Nm |
| Maximum Speed | 9,500 RPM |
| Hub Material | 45 Carbon Steel |
| Spider Material | Polyurethane |
| Operating Temperature | -35°C to 80°C |
| Bore Tolerance | H7 |
| Keyway Tolerance | JS9 |
| Blind Bore Status | Unmachined (Customer secondary processing required) |
Design Notes
- XL4 model uses a 4-jaw spider configuration
- Default configuration without stepped bore
- Bore tolerance H7 and keyway tolerance JS9 for reliable fit and transmission
- Custom bore sizes, stepped bores, and keyways are available upon request
Typical Applications
- CNC machine drive systems
- Servo motor and stepper motor connections
- Automation and positioning equipment
- Packaging machinery
- Light-duty industrial transmission systems
Spider (Elastomer Insert) Information
The jaw coupling uses a replaceable polyurethane spider to reduce vibration and shock loads.
- Standard spider: Red polyurethane elastomer
- Wear-resistant and oil-resistant for industrial use
- Replaceable design for easy maintenance
- Compatible spider model: GR38 (for XL4)
Selection & Installation Tips
- Ensure shaft dimensions match your required bore machining plan (H7 tolerance)
- Confirm the required torque does not exceed the rated torque
- Blind bore versions are delivered without internal machining — final machining is required by the customer
- For high-speed applications, ensure proper alignment during installation
- Contact us for custom bore combinations, special keyways, or stepped bore requirements
FAQ
Q: What is the difference between XL4 and other XL series sizes?
A: XL4 offers higher torque capacity and larger bore ranges than smaller XL sizes, making it suitable for more demanding compact transmission applications while still providing shock absorption.
Q: Is this coupling suitable for reversing rotation?
A: Yes. Jaw couplings are suitable for bidirectional and reversing applications when properly installed and aligned.
Q: Can you provide custom bores and keyways?
A: Yes. We can provide custom bore sizes, stepped bores, and keyways upon request. Please share your shaft specifications when contacting us.
Explore Other Sizes
Looking for other sizes? Browse our XL Jaw Coupling Series to compare different outer diameters, torque ratings, and speed limits.