Product Overview
Our Machined Aluminum Alloy Spider Coupling (also known as a flexible jaw coupling, three-piece shaft coupling, or elastomeric insert coupling) is a precision-engineered power transmission component designed to connect driver and driven shafts while accommodating misalignment and dampening vibration. This zero-backlash flexible coupling consists of two precision CNC machined aluminum alloy hubs and a high-performance polyurethane spider insert (elastomer element), offering an optimal balance of lightweight construction, high torque density, and maintenance-free operation.
The star-shaped spider coupling design features curved jaw profiles that press-fit with the convex spider lobes, creating a pre-stressed assembly that ensures backlash-free torque transmission while providing electrical isolation between connected equipment . Ideal for precision motion control applications, these aluminum flexible couplings deliver reliable performance in servo systems, stepper motors, and automated machinery.
Key Specifications
| Parameter | Details |
| Material | High-strength Aluminum Alloy (6061-T6 / 7075-T6) |
| Spider Material | Polyurethane (available in 80A, 92A, 98A Shore hardness) |
| Manufacturing Process | Precision CNC Turning & Milling |
| Bore Tolerance | H7 standard (custom tolerances available) |
| Surface Finish | Passivated / Natural / Anodized |
| Temperature Range | -40°C to +120°C (depending on spider material) |
| Backlash | Zero (under proper pre-load) |
| Lubrication | Maintenance-free / No lubrication required |
| Max Speed | Up to 28,000 RPM (size-dependent) |
| Torque Capacity | 1.8 Nm to 685 Nm (depending on size and spider durometer) |
Products Description
| Hardness | Color | Material | Application Characteristics |
| 80 Shore A | Blue | Polyurethane | Low torque, maximum misalignment absorption, high dampening |
| 92 Shore A | Yellow | Polyurethane | Medium torque, balanced performance, general-purpose |
| 98 Shore A | Red | Polyurethane | High torque, maximum torsional stiffness, minimal misalignment |
Products Description
| Size | Max Bore (mm) | Outer Dia. (mm) | Total Length (mm) | Rated Torque (Nm) @ 98A | Max RPM |
| 14 | 16 | 30 | 35 | 12.5 | 15,900 |
| 19 | 24 | 40 | 66 | 17 | 11,900 |
| 24 | 32 | 55 | 78 | 60 | 8,850 |
| 28 | 38 | 65 | 90 | 160 | 7,350 |
| 38 | 48 | 80 | 114 | 325 | 5,950 |
| 42 | 55 | 95 | 126 | 450 | 5,000 |
| 48 | 62 | 105 | 140 | 525 | 4,550 |
Why Choose Our Machined Aluminum Spider Couplings?
Superior Material Selection
We use only high-grade aluminum alloy bar stock (2024, 6061-T6, 7075-T6) sourced from certified mills . This ensures consistent mechanical properties, excellent machinability, and long-term dimensional stability.
Advanced Manufacturing Capabilities
Our ISO 9001:2015 certified facility features:
- Multi-axis CNC turning centers and milling machines .
- In-process inspection with CMM equipment
- Dynamic balancing available for high-speed applications
- Strict quality control at every production stage
Engineering Expertise
With decades of combined experience in power transmission and precision machining, our engineering team understands the demands of modern automation . We offer:
- Application engineering support
- Custom bore and keyway configurations
- Special spider durometer selection
- Prototyping services for new designs
Customization Options
Every application is unique. We provide:
- Custom bore sizes (from 3 mm to 62 mm+)
- Keyways and set screw configurations
- Clamp-style hubs for gentle shaft retention
- Step bores for connecting different shaft diameters
- Anodized finishes for enhanced corrosion protection
- Non-standard materials upon request
Quality Assurance
Each coupling undergoes rigorous inspection to verify:
- Bore diameter tolerance (H7 standard)
- Concentricity and runout
- Jaw profile geometry
- Spider fit and pre-load
- Dynamic balance (when specified)
Competitive Lead Times
We understand that downtime is costly. Our streamlined production process and inventory management ensure:
- Fast turnaround on standard sizes
- Rapid prototyping for custom requirements
- Reliable on-time delivery for production orders
Ordering Information
When ordering, please specify:
- Coupling size (based on shaft diameters)
- Bore diameters (D1 and D2)
- Spider hardness (80A, 92A, or 98A)
- Hub style (set screw or clamp-type)
- Keyway requirements (if any)
- Quantity
faq
What is the difference between a spider coupling and a jaw coupling?
They refer to the same product family. "Spider coupling" emphasizes the elastomeric insert (spider), while "jaw coupling" describes the hub geometry. Both terms are used interchangeably in the industry.
Can these couplings handle high-speed applications?
Yes. Depending on size, our aluminum spider couplings operate at speeds up to 28,000 RPM . For very high speeds, we recommend balanced clamp-style hubs and 98A spiders.
How do I know which spider hardness to choose?
Consider your application priorities:
- High torque / precision positioning → 98A (Red)
- General purpose / moderate damping → 92A (Yellow)
- Maximum vibration isolation / misalignment → 80A (Blue)
Are these couplings electrically insulating?
Yes. The polyurethane spider provides complete electrical isolation between shafts, preventing stray current damage.
What is the typical lead time?
Standard sizes with standard bores ship within 15 business days. Custom bores and keyways typically add 25 days. Contact us for current lead times.
Do you offer samples for testing?
Yes. We support engineering validation with prototype quantities. Contact our sales team to discuss your requirements.
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