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Flexible Jaw Couplings
ISL Products International offers a premium selection of flexible jaw couplings designed to seamlessly connect continuous-duty electric motors with driven machinery, pumps, and gearboxes. Engineered to accommodate slight angular (up to 1°) and parallel (up to 0.015 in) shaft misalignments, these couplings are an ideal choice for applications demanding both precision and reliability.
Key Features & Benefits:
- Optimized Torque Transmission: Utilizing compression-type elastomeric elements, our flexible jaw couplings deliver higher load capacity and superior torque transmission compared to shear-type designs.
- Enhanced Torsional Stiffness: With reduced twist between hubs, these couplings minimize backlash, ensuring near-synchronous movement between the driving and driven shafts—perfect for precise operations in conveyors, pumps, and similar applications.
- Fail-Safe Operation: In the event of an elastomeric spider failure, the coupling continues to function by allowing the driving jaws to contact the driven jaws directly. This fail-safe design helps prevent unexpected downtime, giving maintenance teams the flexibility to schedule repairs conveniently.
- Easy Installation & Inspection: Featuring a simple three-piece assembly—metal hubs with an interposed, contoured elastomeric spider—our flexible jaw couplings are straightforward to install, even in confined spaces.
Discover the perfect balance of performance, safety, and ease-of-use with our flexible jaw couplings. Browse our selection of flexible jaw couplings or contact our experts for guidance in choosing the ideal coupling for your application.
| Name | Price (USD) | Shaft Bore Diameter A (mm) | Shaft Bore Diameter B (mm) | Overall Length | Overall Diameter | Coupler Material | Bushing Material | Max. Speed Rating (rpm) | Max. Torque Rating (rpm) | Clamping Screw Type | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| https://shop.islproducts.com/wp-content/uploads/2025/02/mtl-cplr-6x6_640px.png | 2500 | CPLR-FJ-8-10-30-25-AL-P | 8mm x 10mm Flexible Jaw Coupling | 17.55 | 8 | 10 | 30 | 25 | Aluminum | Polyurethane | 15000 | 1.0x10-6 kg.cm2 | M3 | Flexible Jaw Coupling | CPLR-FJ-8-10-30-25-AL-P | MTL-CPLR-8X10 |
| https://shop.islproducts.com/wp-content/uploads/2025/02/mtl-cplr-6x6_640px.png | 2501 | CPLR-FJ-6-12-30-25-AL-P | 6mm x 12mm Flexible Jaw Coupling | 17.55 | 6 | 12 | 30 | 25 | Aluminum | Polyurethane | 15000 | 1.0x10-6 kg.cm2 | M3 | Flexible Jaw Coupling | CPLR-FJ-6-12-30-25-AL-P | MTL-CPLR-6X12 |
| https://shop.islproducts.com/wp-content/uploads/2025/02/mtl-cplr-6x6_640px.png | 2502 | CPLR-FJ-8-8-30-25-AL-P | 8mm x 8mm Flexible Jaw Coupling | 17.55 | 8 | 8 | 30 | 25 | Aluminum | Polyurethane | 15000 | 1.0x10-6 kg.cm2 | M3 | Flexible Jaw Coupling | CPLR-FJ-8-8-30-25-AL-P | MTL-CPLR-8X8 |
| https://shop.islproducts.com/wp-content/uploads/2025/02/mtl-cplr-6x6_640px.png | 2503 | CPLR-FJ-6-10-30-25-AL-P | 6mm x 10mm Flexible Jaw Coupling | 17.55 | 6 | 10 | 30 | 25 | Aluminum | Polyurethane | 15000 | 1.0x10-6 kg.cm2 | M3 | Flexible Jaw Coupling | CPLR-FJ-6-10-30-25-AL-P | MTL-CPLR-6X10 |
| https://shop.islproducts.com/wp-content/uploads/2025/02/mtl-cplr-6x6_640px.png | 2504 | CPLR-FJ-6-8-30-25-AL-P | 6mm x 8mm Flexible Jaw Coupling | 17.55 | 6 | 8 | 30 | 25 | Aluminum | Polyurethane | 15000 | 1.0x10-6 kg.cm2 | M3 | Flexible Jaw Coupling | CPLR-FJ-6-8-30-25-AL-P | MTL-CPLR-6X8 |
| https://shop.islproducts.com/wp-content/uploads/2025/02/mtl-cplr-6x6_640px.png | 2505 | CPLR-FJ-8-12-30-25-AL-P | 8mm x 12mm Flexible Jaw Coupling | 17.55 | 8 | 14 | 30 | 25 | Aluminum | Polyurethane | 15000 | 1.0x10-6 kg.cm2 | M3 | Flexible Jaw Coupling | CPLR-FJ-8-12-30-25-AL-P | MTL-CPLR-8X12 |
| https://shop.islproducts.com/wp-content/uploads/2025/02/mtl-cplr-6x6_640px.png | 2506 | CPLR-FJ-10-10-30-25-AL-P | 10mm x 10mm Flexible Jaw Coupling | 17.55 | 10 | 10 | 30 | 25 | Aluminum | Polyurethane | 15000 | 1.0x10-6 kg.cm2 | M3 | Flexible Jaw Coupling | CPLR-FJ-10-10-30-25-AL-P | MTL-CPLR-10X10 |
| https://shop.islproducts.com/wp-content/uploads/2025/02/mtl-cplr-6x6_640px.png | 2507 | CPLR-FJ-12-12-30-25-AL-P | 12mm x 12mm Flexible Jaw Coupling | 17.55 | 12 | 12 | 30 | 25 | Aluminum | Polyurethane | 15000 | 1.0x10-6 kg.cm2 | M3 | Flexible Jaw Coupling | CPLR-FJ-12-12-30-25-AL-P | MTL-CPLR-12X12 |
| https://shop.islproducts.com/wp-content/uploads/2025/02/mtl-cplr-6x6_640px.png | 2508 | CPLR-FJ-6-6-30-25-AL-P | 6mm x 6mm Flexible Jaw Coupling | 17.55 | 6 | 6 | 30 | 25 | Aluminum | Polyurethane | 15000 | 1.0x10-6 kg.cm2 | M3 | Flexible Jaw Coupling | CPLR-FJ-6-6-30-25-AL-P | MTL-CPLR-6X6 |
| https://shop.islproducts.com/wp-content/uploads/2025/02/mtl-cplr-6x6_640px.png | 2509 | CPLR-FJ-10-12-30-25-AL-P | 10mm x 12mm Flexible Jaw Coupling | 17.55 | 10 | 12 | 30 | 25 | Aluminum | Polyurethane | 15000 | 1.0x10-6 kg.cm2 | M3 | Flexible Jaw Coupling | CPLR-FJ-10-12-30-25-AL-P | MTL-CPLR-10X12 |
Frequently Asked Questions
Flexible jaw couplings are used to connect the DC motor's shaft to another component, like a lead screw, sensor, or other moving axle. They are designed to transmit torque while accommodating misalignment, reducing vibration, and absorbing shock loads. This helps protect the motor and connected components from damage and improves system performance.
Flexible jaw couplings use an elastomeric insert (spider) between two metal hubs. This spider is designed to flex, allowing for angular, parallel, and axial misalignment between the motor and driven component. The material properties of the spider dictate the amount of misalignment it can handle.
Benefits include:
- Misalignment Compensation: Protects bearings and shafts from premature wear.
- Vibration Reduction: Minimizes noise and improves system stability.
- Shock Absorption: Reduces the impact of sudden loads, extending component life.
- Easy Installation: Typically a simple two-hub and spider assembly.
- Cost-Effective: Often a more affordable solution compared to other coupling types.
- Electrical Insulation: The elastomer spider often provides electrical insulation between shafts.
Common spider materials include:
- Urethane: Offers good torque capacity and damping.
- Hytrel: Provides a balance of flexibility and torque capacity, suitable for higher temperatures.
- NBR (Nitrile Rubber): Cost-effective, good for general-purpose applications.
- Various hardness ratings: Spiders are available in different durometers, which determine their stiffness and torque capacity. Softer spiders absorb more vibration and misalignment, while harder spiders handle higher torque.
Consider these factors:
- Motor Shaft Diameter: Ensure the coupling bore matches the motor shaft.
- Driven Component Shaft Diameter: The coupling bore must also match the driven component.
- Torque Requirements: Select a coupling with a torque rating that exceeds the maximum torque of the motor and application.
- Misalignment Requirements: Choose a spider that can accommodate the expected misalignment.
- Operating Speed: Ensure the coupling's maximum speed rating is sufficient.
- Environmental Conditions: Consider temperature, chemicals, and other factors that may affect the spider material.
Yes, but the torque capacity depends on the size and material of the coupling and spider. For high-torque applications, larger couplings with harder spiders or specialized materials like Hytrel are recommended. Always refer to the manufacturer's specifications.
Installation typically involves:
- Cleaning the shafts: Remove any debris or burrs.
- Sliding the hubs onto the shafts: Ensure proper alignment.
- Securing the hubs: Tighten the set screws or clamping screws to the manufacturer's torque specifications.
- Inserting the spider: Align the spider between the hubs.
Yes, flexible jaw couplings can be used with servo motors, but it's crucial to select a coupling with low backlash and high torsional stiffness for precise positioning. Spiders with higher durometer ratings are often chosen for servo applications.
The maximum operating temperature depends on the spider material. Refer to the manufacturer's specifications for the specific spider material being used.
Those terms are often used interchangeably. Jaw coupling refers to the whole assembly of two hubs and the elastomeric insert. Spider coupling often refers to just the elastomeric insert. So they are not different, but rather refer to different parts of the same assembly.
Regular inspection is crucial. The frequency depends on the application's severity. In general:
- For standard applications, inspect every 3 to 6 months.
- For high-speed or high-torque applications, inspect monthly or even weekly.
- Pay close attention after initial installation and during periods of increased load or vibration.
Look for:
- Cracks or tears in the spider.
- Excessive wear on the spider's lobes.
- Loose set screws or clamping screws.
- Signs of corrosion on the hubs.
- Unusual vibration or noise during operation.
- Excessive amounts of dust from the elastomer spider.
Yes, one of the key advantages of flexible jaw couplings is that the spider is a replaceable component. This makes maintenance cost-effective.
Generally, flexible jaw couplings do not require lubrication. The elastomeric spider provides inherent damping and flexibility. However it is always best to check the manufacturers specifications.
Failure can lead to:
- Loss of power transmission.
- Increased vibration and noise.
- Damage to the motor or driven equipment.
- In severe cases, complete system failure.
Yes. Temperature, chemicals, and humidity can affect the spider material.
- High temperatures can cause the spider to degrade.
- Certain chemicals can cause swelling or deterioration.
- Always select a spider material compatible with the operating environment.
Replace the coupling when:
- The spider shows signs of significant wear or damage.
- The hubs are corroded or damaged.
- You observe excessive vibration or noise that cannot be resolved by tightening fasteners.
- When the equipment that the coupling is installed on is being overhauled.
Yes. Hubs can be made from steel, stainless steel, or aluminum. Spiders are available in various elastomers to suit different needs.
Common applications include:
- Robotics.
- Automation equipment.
- Pumps.
- Conveyors.
- Machine tools.
- Lead screw drives.
Detailed information about flexible jaw coupling are available under the "Product Specifications" and "Technical Resources" tabs on the product pages. The "Technical Resources" section includes links to the drawing and datasheet, if available. If a specific resource is unavailable for download, you can submit a request to ISL Products' engineering team directly from the product page. Additionally, you may contact ISL Products directly at for further assistance or additional information.