A Jaw Coupling is a flexible power transmission coupling designed to connect two rotating shafts while accommodating misalignment and absorbing shock loads. It consists of two aluminum or stainless steel hubs with interlocking jaws, separated by an elastomeric spider that provides flexibility and damping. Commonly used in applications such as pumps, compressors, conveyors, and industrial machinery, jaw couplings offer easy installation, maintenance-free operation, and reliable performance in various environments.
Our jaw couplings are manufactured to high standards, with detailed specifications provided below. Use the tables to select the right coupling for your application based on torque capacity, bore size, and environmental conditions.
| Size | Max Torque (Nm) | Max RPM | Bore Range (mm) | Spider Material Options |
|---|---|---|---|---|
| JC-25 | 5.2 | 10,000 | 6-14 | NBR, Urethane |
| JC-38 | 18.5 | 8,000 | 10-20 | NBR, Urethane, Hytrel |
| JC-50 | 45.0 | 6,000 | 12-25 | NBR, Urethane, Hytrel |
| JC-75 | 120.0 | 4,500 | 18-35 | NBR, Urethane, Hytrel |
| JC-100 | 250.0 | 3,600 | 25-45 | NBR, Urethane, Hytrel |
| Material | Temperature Range (°C) | Chemical Resistance | Typical Applications |
|---|---|---|---|
| NBR Spider | -30 to +100 | Good for oils, fuels, water | General purpose, automotive, pumps |
| Urethane Spider | -40 to +85 | Excellent for abrasion, ozone | High-torque, heavy-duty machinery |
| Hytrel Spider | -50 to +150 | Superior for chemicals, high temps | Food processing, chemical industries |
| Aluminum Hubs | -50 to +120 | Lightweight, corrosion-resistant | Most industrial applications |
| Stainless Steel Hubs | -50 to +200 | High corrosion resistance | Marine, pharmaceutical, washdown environments |
What types of misalignment can a jaw coupling handle?
Jaw couplings can handle angular misalignment up to 1-2 degrees, parallel misalignment up to 0.5-1 mm, and axial misalignment (end float) depending on the size and design. The elastomeric spider flexes to accommodate these deviations without significant loss of torque transmission.
How do I select the right jaw coupling size for my application?
To select the appropriate size, calculate the required torque based on your application's power and speed, consider the shaft sizes (bore range), and account for environmental factors like temperature and exposure to chemicals. Refer to our torque tables and material guides for matching specifications.
What maintenance is required for jaw couplings?
Jaw couplings are generally maintenance-free. Periodically inspect the spider for wear, cracks, or hardening, especially in high-stress environments. Replace the spider if signs of degradation appear, as it is the wear component. No lubrication is needed for the hubs or spider.
Can jaw couplings be used in high-temperature applications?
Yes, but the spider material must be chosen carefully. Standard NBR spiders are suitable up to 100°C, while Hytrel spiders can handle temperatures up to 150°C. For higher temperatures, consult special material options or alternative coupling types.
What are the advantages of jaw couplings over other coupling types?
Jaw couplings offer simplicity, cost-effectiveness, and excellent shock absorption. They are easier to install and maintain compared to gear or grid couplings, and provide zero backlash, making them ideal for applications requiring precise motion control without frequent realignment.
How do I install a jaw coupling properly?
Ensure shafts are clean and free of burrs. Slide the hubs onto the shafts and align them within specified misalignment limits. Insert the spider between the jaws, making sure it seats properly. Tighten set screws or clamping mechanisms securely, but avoid over-torquing to prevent hub damage.
What causes jaw coupling failure, and how can it be prevented?
Common failure causes include excessive misalignment, overloading, improper installation, and spider degradation due to heat or chemicals. Prevent failure by selecting the correct size and material, maintaining within misalignment limits, and conducting regular inspections for wear.
Are jaw couplings suitable for reverse motion or high-cyclic applications?
Yes, jaw couplings handle reverse motion effectively due to their symmetrical design. For high-cyclic applications, ensure the spider material has good fatigue resistance (e.g., urethane or Hytrel) and monitor wear more frequently to avoid unexpected downtime.
