About Shaft Couplings
More
Clamping Precision Flexible Shaft Couplings
Designed to grip evenly around your shaft, these couplings provide more holding power than set screw couplings without marring the shaft. Tighten the clamping screws to secure.
Spiral couplings have long cuts in their body for flexibility to handle parallel, axial, and angular misalignment better than parallel couplings. However, they’re not as rigid. Often used for light duty encoder and stepper drive applications, they allow zero backlash (no play) and never need lubrication. They’re also known as helical beam couplings.
Aluminum couplings are lightweight with good corrosion resistance.
For technical drawings and 3-D models, click on a part number.
Misalignment Capability | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Shaft Dia. | Overall Lg. | OD | Max. Speed, rpm | Max. Torque, in.-lbs. | Parallel | Angular | Axial | For Motion Type | Each | |
Spiral Cut | ||||||||||
7075 Aluminum | ||||||||||
| 1/4" × 7/16" | 1 1/4" | 1 1/4" | 10,000 | 84 | 0.006" | 3° | 0.006" | Forward/Reverse, Start/Stop | 00000000 | 000000 |
| 5/16" × 7/16" | 2" | 1 1/4" | 10,000 | 115 | 0.015" | 5° | 0.01" | Forward/Reverse, Start/Stop | 00000000 | 000000 |
| 3/8" × 7/16" | 1 1/4" | 1 1/4" | 10,000 | 84 | 0.006" | 3° | 0.006" | Forward/Reverse, Start/Stop | 00000000 | 00000 |
| 3/8" × 7/16" | 2" | 1 1/4" | 10,000 | 115 | 0.015" | 5° | 0.01" | Forward/Reverse, Start/Stop | 00000000 | 000000 |
| 3/8" × 7/16" | 2 3/8" | 1 1/2" | 10,000 | 155 | 0.015" | 5° | 0.01" | Forward/Reverse, Start/Stop | 00000000 | 000000 |
| 7/16" × 1/4" | 2" | 1 1/4" | 10,000 | 115 | 0.015" | 5° | 0.01" | Forward/Reverse, Start/Stop | 00000000 | 000000 |
| 7/16" × 5/16" | 1 1/4" | 1 1/4" | 10,000 | 84 | 0.006" | 3° | 0.006" | Forward/Reverse, Start/Stop | 00000000 | 00000 |
| 7/16" × 7/16" | 1 1/4" | 1 1/4" | 10,000 | 84 | 0.006" | 3° | 0.006" | Forward/Reverse, Start/Stop | 00000000 | 00000 |
| 7/16" × 7/16" | 2" | 1 1/4" | 10,000 | 115 | 0.015" | 5° | 0.01" | Forward/Reverse, Start/Stop | 00000000 | 000000 |
| 7/16" × 7/16" | 2 3/8" | 1 1/2" | 10,000 | 155 | 0.015" | 5° | 0.01" | Forward/Reverse, Start/Stop | 00000000 | 000000 |
| 7/16" × 7/16" | 2 1/2" | 1 5/8" | 10,000 | 215 | 0.015" | 5° | 0.01" | Forward/Reverse, Start/Stop | 00000000 | 000000 |
| 7/16" × 1/2" | 1 1/4" | 1 1/4" | 10,000 | 84 | 0.006" | 3° | 0.006" | Forward/Reverse, Start/Stop | 00000000 | 00000 |
| 7/16" × 1/2" | 2" | 1 1/4" | 10,000 | 115 | 0.015" | 5° | 0.01" | Forward/Reverse, Start/Stop | 00000000 | 000000 |
| 7/16" × 1/2" | 2 3/8" | 1 1/2" | 10,000 | 155 | 0.015" | 5° | 0.01" | Forward/Reverse, Start/Stop | 00000000 | 000000 |
| 3/4" × 7/16" | 2 3/4" | 1 3/4" | 10,000 | 250 | 0.015" | 5° | 0.01" | Forward/Reverse, Start/Stop | 00000000 | 000000 |
Set Screw Precision Flexible Shaft Couplings
Tighten the set screws to fasten these couplings to your shaft. Set screws bite into the shaft to hold the couplings in place. All are lightweight, corrosion-resistant aluminum.
Spiral couplings have long, continuous cuts in the body, making them flexible enough to handle parallel, axial, and angular misalignment. Often used for light duty encoder and stepper drive applications, they allow zero backlash (no play) and never need lubrication. They’re also known as helical beam couplings. Spiral couplings are less rigid than parallel couplings.
For technical drawings and 3-D models, click on a part number.
Misalignment Capability | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Shaft Dia. | Overall Lg. | OD | Max. Speed, rpm | Max. Torque, in.-lbs. | Parallel | Angular | Axial | For Motion Type | Each | |
Spiral Cut | ||||||||||
7075 Aluminum | ||||||||||
| 7/16" × 5/16" | 1 1/4" | 1 1/4" | 10,000 | 84 | 0.006" | 3° | 0.006" | Forward/Reverse, Start/Stop | 00000000 | 000000 |
| 7/16" × 3/8" | 1 1/4" | 1 1/4" | 10,000 | 84 | 0.006" | 3° | 0.006" | Forward/Reverse, Start/Stop | 00000000 | 00000 |
| 1/2" × 7/16" | 1 1/4" | 1 1/4" | 10,000 | 84 | 0.006" | 3° | 0.006" | Forward/Reverse, Start/Stop | 00000000 | 00000 |
Set Screw Flexible Shaft Couplings
Each hub includes a set screw (unless noted), which bites into your shaft to hold the coupling in place. Also known as Lovejoy® couplings, these three-piece couplings have a spider-shaped cushion between two hubs to reduce shock and handle minor shaft misalignment.
A complete coupling consists of two hubs and one spider, or two hubs, one split spider, and one retaining ring (all components sold separately). Split spiders are easier to install and replace than standard spiders because there’s no need for tools or removing your hubs. Twist-lock them in place using a retaining ring.
Buna-N spiders provide good vibration damping and chemical resistance. Hytrel spiders provide fair vibration damping and excellent chemical resistance. Polyurethane spiders and split spiders provide fair vibration damping and good chemical resistance.
For technical drawings and 3-D models, click on a part number.
Buna-N Rubber Spiders | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Iron Hubs | Misalignment Capability | ||||||||||||
| Overall Lg. | OD | For Shaft Type | For Motion Type | For Shaft Dia. | Each | Max. Speed, rpm | Max. Torque, in.-lbs. | Parallel | Angular | Temp. Range, °F | Each | ||
| 1 23/32" | 1 5/64" | Round | Forward/Reverse, Start/Stop | 7/16" | 0000000 | 00000 | 18,000 | 26 | 0.015" | 1° | -40° to 212° | 0000000 | 00000 |
| 1 63/64" | 1 23/64" | Round | Forward/Reverse, Start/Stop | 7/16" | 00000000 | 00000 | 14,000 | 43 | 0.015" | 1° | -40° to 212° | 0000000 | 0000 |
| 2 1/8" | 1 3/4" | Round | Forward/Reverse, Start/Stop | 7/16" | 00000000 | 00000 | 11,000 | 90 | 0.015" | 1° | -40° to 212° | 0000000 | 00000 |
| 2 5/32" | 2 7/64" | Round | Forward/Reverse, Start/Stop | 7/16" | 0000000 | 00000 | 9,000 | 140 | 0.015" | 1° | -40° to 212° | 0000000 | 00000 |
| 2 1/2" | 2 7/64" | Round | Forward/Reverse, Start/Stop | 7/16" | 00000000 | 00000 | 9,000 | 140 | 0.015" | 1° | -40° to 212° | 0000000 | 00000 |
| 2 27/32" | 2 35/64" | Round | Forward/Reverse, Start/Stop | 7/16" | 00000000 | 00000 | 7,000 | 315 | 0.015" | 1° | -40° to 212° | 0000000 | 00000 |
| 3 31/64" | 2 35/64" | Round | Forward/Reverse, Start/Stop | 7/16" | 00000000 | 00000 | 7,000 | 315 | 0.015" | 1° | -40° to 212° | 0000000 | 00000 |
Hytrel Rubber Spiders | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Iron Hubs | Misalignment Capability | ||||||||||||
| Overall Lg. | OD | For Shaft Type | For Motion Type | For Shaft Dia. | Each | Max. Speed, rpm | Max. Torque, in.-lbs. | Parallel | Angular | Temp. Range, °F | Each | ||
| 1 23/32" | 1 5/64" | Round | Forward/Reverse, Start/Stop | 7/16" | 0000000 | 00000 | 18,000 | 50 | 0.015" | 0.5° | -55° to 245° | 0000000 | 000000 |
| 1 63/64" | 1 23/64" | Round | Forward/Reverse, Start/Stop | 7/16" | 00000000 | 00000 | 3,600 | 110 | 0.015" | 0.5° | -55° to 245° | 0000000 | 00000 |
| 2 1/8" | 1 3/4" | Round | Forward/Reverse, Start/Stop | 7/16" | 00000000 | 00000 | 3,600 | 225 | 0.015" | 0.5° | -55° to 245° | 0000000 | 00000 |
| 2 5/32" | 2 7/64" | Round | Forward/Reverse, Start/Stop | 7/16" | 0000000 | 00000 | 3,600 | 225 | 0.015" | 0.5° | -55° to 245° | 0000000 | 00000 |
| 2 1/2" | 2 7/64" | Round | Forward/Reverse, Start/Stop | 7/16" | 00000000 | 00000 | 3,600 | 400 | 0.015" | 0.5° | -55° to 245° | 0000000 | 00000 |
| 2 27/32" | 2 35/64" | Round | Forward/Reverse, Start/Stop | 7/16" | 00000000 | 00000 | 3,600 | 790 | 0.015" | 0.5° | -55° to 245° | 0000000 | 000000 |
| 3 31/64" | 2 35/64" | Round | Forward/Reverse, Start/Stop | 7/16" | 00000000 | 00000 | 3,600 | 790 | 0.015" | 0.5° | -55° to 245° | 0000000 | 000000 |
Polyurethane Spiders | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Iron Hubs | Misalignment Capability | ||||||||||||
| Overall Lg. | OD | For Shaft Type | For Motion Type | For Shaft Dia. | Each | Max. Speed, rpm | Max. Torque, in.-lbs. | Parallel | Angular | Temp. Range, °F | Each | ||
| 2 1/8" | 1 3/4" | Round | Forward/Reverse, Start/Stop | 7/16" | 00000000 | 000000 | 3,600 | 135 | 0.015" | 1° | -30° to 160° | 0000000 | 000000 |
| 2 5/32" | 2 7/64" | Round | Forward/Reverse, Start/Stop | 7/16" | 0000000 | 00000 | 3,600 | 210 | 0.015" | 1° | -30° to 160° | 0000000 | 00000 |
| 2 1/2" | 2 7/64" | Round | Forward/Reverse, Start/Stop | 7/16" | 00000000 | 00000 | 3,600 | 210 | 0.015" | 1° | -30° to 160° | 0000000 | 00000 |
| 2 27/32" | 2 35/64" | Round | Forward/Reverse, Start/Stop | 7/16" | 00000000 | 00000 | 3,600 | 475 | 0.015" | 1° | -30° to 160° | 0000000 | 00000 |
| 3 31/64" | 2 35/64" | Round | Forward/Reverse, Start/Stop | 7/16" | 00000000 | 00000 | 3,600 | 475 | 0.015" | 1° | -30° to 160° | 0000000 | 00000 |
Polyurethane Split Spiders | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Iron Hubs | Misalignment Capability | 347 Stainless Steel Retaining Rings | |||||||||||||
| Overall Lg. | OD | For Shaft Type | For Motion Type | For Shaft Dia. | Each | Max. Speed, rpm | Max. Torque, in.-lbs. | Parallel | Angular | Temp. Range, °F | Each | Each | |||
| 2 5/32" | 2 7/64" | Round | Forward/Reverse, Start/Stop | 7/16" | 0000000 | 000000 | 9,200 | 670 | 0.03" | 2° | -30° to 200° | 0000000 | 000000 | 0000000 | 000000 |
| 2 1/2" | 2 7/64" | Round | Forward/Reverse, Start/Stop | 7/16" | 00000000 | 00000 | 9,200 | 670 | 0.03" | 2° | -30° to 200° | 0000000 | 00000 | 0000000 | 00000 |
| 2 27/32" | 2 35/64" | Round | Forward/Reverse, Start/Stop | 7/16" | 00000000 | 00000 | 7,700 | 1,110 | 0.03" | 2° | -30° to 200° | 0000000 | 00000 | 0000000 | 00000 |
| 3 31/64" | 2 35/64" | Round | Forward/Reverse, Start/Stop | 7/16" | 00000000 | 00000 | 7,700 | 1,110 | 0.03" | 2° | -30° to 200° | 0000000 | 00000 | 0000000 | 00000 |
Clamping Flexible Shaft Couplings
Designed to grip evenly around your shaft, these couplings provide more holding power than set screw couplings without marring the shaft. Tighten the clamping screw to secure. Also known as Lovejoy® couplings, they have a spider-shaped cushion between two hubs to reduce shock and handle minor shaft misalignment.
A complete coupling consists of two hubs and one spider (each component sold separately). Hubs are aluminum for light weight and good corrosion resistance.
Hytrel spiders provide fair vibration damping and excellent chemical resistance. Polyurethane spiders provide fair vibration damping and good chemical resistance.
For technical drawings and 3-D models, click on a part number.
Lightweight Flexible Shaft Couplings
Made with lightweight nylon sleeves, these gear couplings require less energy to move than other high-torque flexible couplings. They compensate for parallel, angular, and axial misalignment. Fasten to your shafts by tightening the set screws, which bite into the shaft to hold it.
A complete coupling consists of two hubs and one sleeve (each component sold separately).
For technical drawings and 3-D models, click on a part number.
Nylon Plastic Sleeves | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Steel Hubs | Misalignment Capability | ||||||||||||
| O'all Lg. | OD | For Motion Type | For Shaft Dia. | Each | Max. Speed, rpm | Max. Torque, in.-lbs. | Parallel | Angular | Axial | Max. Temp., °F | Each | ||
| 1 25/32" | 1 37/64" | Continuous | 7/16" | 0000000 | 000000 | 14,000 | 255 | 0.016" | 1° | 0.04" | 180° | 0000000 | 000000 |
| 1 31/32" | 1 29/32" | Continuous | 7/16" | 0000000 | 00000 | 11,800 | 425 | 0.016" | 1° | 0.04" | 180° | 0000000 | 00000 |
Single U-Joints
Connect and transfer torque between two shafts that are misaligned at an angle. Your shafts’ misalignment will affect the speed and torque these U-joints will be able to transmit. The more the shafts are misaligned, the less speed and torque they’ll be able to transmit.
Pin-and-block U-joints handle higher torque at lower speeds than other joint types such as those with needle bearings, making them a good choice for most applications. To extend their life by keeping lubricant in and contaminants out, use the grooves on their body to add a cover (sometimes called bellows or boots).
Steel U-joints are strong and handle more torque than zinc U-joints. U-joints for round shafts connect to shafts with spring pins (included with some U-joints). U-joints without spring pins require you to drill holes through both the U-joint and your shafts.
For technical drawings and 3-D models, click on a part number.
For Shaft | Torque | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dia. | Dp. | Joint Dia. | Overall Lg. | Max. Operating Angle | Max. Speed, rpm | Max. Torque, in.-lbs. | 3° Operating Angle | 10° Operating Angle | Shaft Mount Type | Spring Pins Included | Each | |
Pin-and-Block Joint | ||||||||||||
Steel—For Round Shafts | ||||||||||||
| 7/16" | 7/8" | 7/8" | 3" | 25° | 1,750 | 1,175 | 445 in.-lbs. @ 300 rpm | 150 in.-lbs. @ 300 rpm | Spring Pin | No | 0000000 | 0000000 |
Extreme-Angle Geared Single U-Joints
The gears on these U-joints transmit rotary motion between shafts that are misaligned at angles up to 136°, the widest angle of all our U-joints. Use them in hand-powered, low-speed applications. Drill holes through the U-joint and your shafts and then connect using spring pins.
For technical drawings and 3-D models, click on a part number.
For Shaft | Overall | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dia. | Dp. | Joint Dia. | Ht. | Lg. | Max. Operating Angle | Speed Ratio | Max. Speed | Max. Torque | Joint Type | Each | |
Steel | |||||||||||
| 7/16" | 1 1/8" | 3/4" | 2 3/4" | 10 1/4" | 136° | 1:1 | Not Rated | Not Rated | Geared | 000000 | 0000000 |