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Machinable-Bore Clamping Shaft Couplings



When one of your shafts is undersized from wear, oversized from coatings, or uncommonly sized, machine one end of these couplings to fit. They clamp around your shafts for a secure hold that won’t cause damage. But, you’ll need access to the end of each shaft to slide them into place. Since they’re rigid, they prevent movement between the shafts, making them good for high-torque applications. This also means your shafts must align to connect.
Couplings for keyed shafts grip the shaft’s key to eliminate slipping. They handle higher torque than couplings for round shafts.
Steel couplings resist corrosion in dry environments. 303 stainless steel couplings resist rusting from water. But, they won’t stand up to salt water or chloride.
For technical drawings and 3-D models, click on a part number.
For Shaft Dia. | Overall Lg. | OD | Max. Speed | Max. Torque, in.-lbs. | For Motion Type | Each | |
Steel | |||||||
---|---|---|---|---|---|---|---|
For Keyed Shafts | |||||||
1/2" × 0.235"-0.500" | 1 7/8" | 1 1/4" | Not Rated | 380 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 000000 |
5/8" × 0.235"-0.625" | 2 1/4" | 1 1/2" | Not Rated | 785 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
3/4" × 0.235"-0.750" | 2 5/8" | 1 3/4" | Not Rated | 1,505 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
7/8" × 0.235"-0.875" | 2 7/8" | 1 7/8" | Not Rated | 1,760 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
1" × 0.360"-1.000" | 3" | 2" | Not Rated | 2,010 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
1 1/8" × 0.360"-1.125" | 3 1/4" | 2 1/8" | Not Rated | 2,260 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
1 1/4" × 0.360"-1.250" | 3 3/8" | 2 1/4" | Not Rated | 2,510 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
1 3/8" × 0.360"-1.375" | 3 5/8" | 2 3/8" | Not Rated | 2,770 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
1 1/2" × 0.485"-1.500" | 3 3/4" | 2 1/2" | Not Rated | 3,020 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
1 3/4" × 0.485"-1.750" | 4 1/2" | 3" | Not Rated | 5,625 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 000000 |
2" × 0.485"-2.000" | 4 7/8" | 3 1/4" | Not Rated | 6,430 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 000000 |
8mm × 6.000mm-8.000mm | 30mm | 18mm | Not Rated | 225 | Forward/Reverse, Start/Stop, Continuous | 00000000 | 00000 |
10mm × 6.000mm-10.000mm | 35mm | 24mm | Not Rated | 285 | Forward/Reverse, Start/Stop, Continuous | 00000000 | 00000 |
12mm × 6.000mm-12.000mm | 45mm | 28mm | Not Rated | 545 | Forward/Reverse, Start/Stop, Continuous | 00000000 | 00000 |
16mm × 6.000mm-16.000mm | 50mm | 34mm | Not Rated | 1,095 | Forward/Reverse, Start/Stop, Continuous | 00000000 | 00000 |
20mm × 6.000mm-20.000mm | 65mm | 40mm | Not Rated | 2,025 | Forward/Reverse, Start/Stop, Continuous | 00000000 | 00000 |
25mm × 9.500mm-25.000mm | 65mm | 45mm | Not Rated | 2,535 | Forward/Reverse, Start/Stop, Continuous | 00000000 | 00000 |
30mm × 9.500mm-30.000mm | 75mm | 54mm | Not Rated | 5,420 | Forward/Reverse, Start/Stop, Continuous | 00000000 | 000000 |
35mm × 9.500mm-35.000mm | 80mm | 57mm | Not Rated | 3,550 | Forward/Reverse, Start/Stop, Continuous | 00000000 | 000000 |
40mm × 12.500mm-40.000mm | 90mm | 60mm | Not Rated | 4,055 | Forward/Reverse, Start/Stop, Continuous | 00000000 | 000000 |
For Round Shafts | |||||||
1/2" × 0.235"-0.500" | 1 7/8" | 1 1/4" | Not Rated | 285 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
5/8" × 0.235"-0.625" | 2 1/4" | 1 1/2" | Not Rated | 490 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
3/4" × 0.235"-0.750" | 2 5/8" | 1 3/4" | Not Rated | 1,130 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
7/8" × 0.235"-0.875" | 2 7/8" | 1 7/8" | Not Rated | 1,320 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
1" × 0.360"-1.000" | 3" | 2" | Not Rated | 1,510 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
1 1/8" × 0.360"-1.125" | 3 1/4" | 2 1/8" | Not Rated | 1,695 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
1 1/4" × 0.360"-1.250" | 3 3/8" | 2 1/4" | Not Rated | 1,885 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
1 3/8" × 0.360"-1.375" | 3 5/8" | 2 3/8" | Not Rated | 2,080 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
1 1/2" × 0.485"-1.500" | 3 3/4" | 2 1/2" | Not Rated | 2,265 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
1 3/4" × 0.485"-1.750" | 4 1/2" | 3" | Not Rated | 4,220 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
2" × 0.485"-2.000" | 4 7/8" | 3 1/4" | Not Rated | 4,825 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 000000 |
8mm × 6.000mm-8.000mm | 30mm | 18mm | Not Rated | 170 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
10mm × 6.000mm-10.000mm | 35mm | 24mm | Not Rated | 210 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
12mm × 6.000mm-12.000mm | 45mm | 28mm | Not Rated | 405 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
16mm × 6.000mm-16.000mm | 50mm | 34mm | Not Rated | 820 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
20mm × 6.000mm-20.000mm | 65mm | 40mm | Not Rated | 1,520 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
25mm × 9.500mm-25.000mm | 65mm | 45mm | Not Rated | 1,900 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
30mm × 9.500mm-30.000mm | 75mm | 54mm | Not Rated | 4,065 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
35mm × 9.500mm-35.000mm | 80mm | 57mm | Not Rated | 2,660 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 000000 |
40mm × 12.500mm-40.000mm | 90mm | 60mm | Not Rated | 3,040 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 000000 |
303 Stainless Steel | |||||||
For Keyed Shafts | |||||||
1/2" × 0.235"-0.500" | 1 7/8" | 1 1/4" | Not Rated | 260 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
5/8" × 0.235"-0.625" | 2 1/4" | 1 1/2" | Not Rated | 540 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
3/4" × 0.235"-0.750" | 2 5/8" | 1 3/4" | Not Rated | 1,035 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 000000 |
1" × 0.360"-1.000" | 3" | 2" | Not Rated | 1,380 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 000000 |
1 1/8" × 0.360"-1.125" | 3 1/4" | 2 1/8" | Not Rated | 1,550 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 000000 |
1 1/4" × 0.360"-1.250" | 3 3/8" | 2 1/4" | Not Rated | 1,725 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 000000 |
1 1/2" × 0.485"-1.500" | 3 3/4" | 2 1/2" | Not Rated | 2,075 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 000000 |
10mm × 6.000mm-10.000mm | 35mm | 24mm | Not Rated | 65 | Forward/Reverse, Start/Stop, Continuous | 00000000 | 00000 |
12mm × 6.000mm-12.000mm | 45mm | 28mm | Not Rated | 240 | Forward/Reverse, Start/Stop, Continuous | 00000000 | 00000 |
16mm × 6.000mm-16.000mm | 50mm | 34mm | Not Rated | 485 | Forward/Reverse, Start/Stop, Continuous | 00000000 | 00000 |
20mm × 6.000mm-20.000mm | 65mm | 40mm | Not Rated | 900 | Forward/Reverse, Start/Stop, Continuous | 00000000 | 000000 |
For Round Shafts | |||||||
1/2" × 0.235"-0.500" | 1 7/8" | 1 1/4" | Not Rated | 195 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
5/8" × 0.235"-0.625" | 2 1/4" | 1 1/2" | Not Rated | 405 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
3/4" × 0.235"-0.750" | 2 5/8" | 1 3/4" | Not Rated | 775 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 00000 |
7/8" × 0.235"-0.875" | 2 7/8" | 1 7/8" | Not Rated | 905 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 000000 |
1" × 0.360"-1.000" | 3" | 2" | Not Rated | 1,035 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 000000 |
1 1/4" × 0.360"-1.250" | 3 3/8" | 2 1/4" | Not Rated | 1,295 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 000000 |
1 1/2" × 0.485"-1.500" | 3 3/4" | 2 1/2" | Not Rated | 1,555 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 000000 |
1 3/4" × 0.485"-1.750" | 4 1/2" | 3" | Not Rated | 2,900 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 000000 |
8mm × 6.000mm-8.000mm | 30mm | 18mm | Not Rated | 35 | Forward/Reverse, Start/Stop, Continuous | 00000000 | 00000 |
10mm × 6.000mm-10.000mm | 35mm | 24mm | Not Rated | 45 | Forward/Reverse, Start/Stop, Continuous | 00000000 | 00000 |
12mm × 6.000mm-12.000mm | 45mm | 28mm | Not Rated | 180 | Forward/Reverse, Start/Stop, Continuous | 00000000 | 00000 |
16mm × 6.000mm-16.000mm | 50mm | 34mm | Not Rated | 365 | Forward/Reverse, Start/Stop, Continuous | 00000000 | 00000 |
20mm × 6.000mm-20.000mm | 65mm | 40mm | Not Rated | 675 | Forward/Reverse, Start/Stop, Continuous | 00000000 | 00000 |
Machinable-Bore Flexible Shaft Couplings


Customize the bore of these flexible couplings to align uncommon shaft sizes as well as shafts that have become undersized from wear or oversized from coatings. 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 (all components sold separately). Fasten to your shaft with set screws (not included), which bite into the shaft for a secure hold. If the spider fails, the hubs will lock together, giving you time to shut down your equipment to prevent component damage and replace the spider. These couplings do not need lubrication.
Buna-N spiders are the most commonly used because they damp the most vibration, making them best for forward/reverse and start/stop motion. They resist oil and chemicals.
Polyurethane spiders can run at a higher torque than Buna-N spiders, but do not offer as much vibration damping. Use them for continuous motion. Similar to Buna-N, they resist oil and chemicals.
Hytrel spiders operate at the highest torque, but are less flexible than Buna-N and polyurethane spiders so they have less misalignment and vibration damping capabilities. Use them for continuous motion. Compared to Buna-N and polyurethane, these have the best oil and chemical resistance.
For technical drawings and 3-D models, click on a part number.
Iron Hubs | Buna-N Spiders | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Set Screw | Misalignment Capability | ||||||||||||||
For Shaft Dia. | Overall Lg. | OD | For Motion Type | Material | Type | Thread Size | Each | Max. Speed, rpm | Max. Torque, in.-lbs. | Parallel | Angular | Temp. Range, °F | Each | ||
1/4"-5/8" | 1 23/32" | 1 5/64" | Forward/Reverse, Start/Stop | Sintered Iron | Cup Point | 1/4"-20 | 00000000 | 00000 | 18,000 | 26 | 0.015" | 1° | -40° to 212° | 0000000 | 00000 |
1/4"-3/4" | 1 63/64" | 1 23/64" | Forward/Reverse, Start/Stop | Sintered Iron | Cup Point | 1/4"-20 | 00000000 | 00000 | 14,000 | 43 | 0.015" | 1° | -40° to 212° | 0000000 | 0000 |
1/4"-7/8" | 2 1/8" | 1 3/4" | Forward/Reverse, Start/Stop | Sintered Iron | Cup Point | 1/4"-20 | 00000000 | 00000 | 11,000 | 90 | 0.015" | 1° | -40° to 212° | 0000000 | 00000 |
1/4"-1" | 2 5/32" | 2 7/64" | Forward/Reverse, Start/Stop | Sintered Iron | Cup Point | 1/4"-20 | 00000000 | 00000 | 9,000 | 140 | 0.015" | 1° | -40° to 212° | 0000000 | 00000 |
7/16"-1 1/8" | 2 1/2" | 2 7/64" | Forward/Reverse, Start/Stop | Sintered Iron | Cup Point | 5/16"-18 | 00000000 | 00000 | 9,000 | 140 | 0.015" | 1° | -40° to 212° | 0000000 | 00000 |
7/16"-1 3/16" | 2 27/32" | 2 35/64" | Forward/Reverse, Start/Stop | Sintered Iron | Cup Point | 5/16"-18 | 00000000 | 00000 | 7,000 | 315 | 0.015" | 1° | -40° to 212° | 0000000 | 00000 |
7/16"-1 3/8" | 3 31/64" | 2 35/64" | Forward/Reverse, Start/Stop | Sintered Iron | Cup Point | 5/16"-18 | 00000000 | 00000 | 7,000 | 315 | 0.015" | 1° | -40° to 212° | 0000000 | 00000 |
5/8"-1 5/8" | 4 7/32" | 3 21/64" | Forward/Reverse, Start/Stop | Sintered Iron | Cup Point | 5/16"-18 | 00000000 | 00000 | 5,000 | 790 | 0.015" | 1° | -40° to 212° | 0000000 | 00000 |
5/8"-1 7/8" | 4 1/2" | 3 3/4" | Forward/Reverse, Start/Stop | Sintered Iron | Cup Point | 3/8"-16 | 00000000 | 000000 | 5,000 | 1,240 | 0.015" | 1° | -40° to 212° | 0000000 | 00000 |
3/4"-2 1/8" | 4 7/8" | 4 1/2" | Forward/Reverse, Start/Stop | Sintered Iron | Cup Point | 1/2"-13 | 00000000 | 000000 | 5,000 | 1,725 | 0.015" | 1° | -40° to 212° | 0000000 | 00000 |
3/4"-2 5/8" | 5 11/32" | 5" | Forward/Reverse, Start/Stop | Cast Iron | Cup Point | 1/2"-13 | 00000000 | 000000 | 4,200 | 2,340 | 0.015" | 1° | -40° to 212° | 0000000 | 00000 |
Iron Hubs | Polyurethane Spiders | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Set Screw | Misalignment Capability | ||||||||||||||
For Shaft Dia. | Overall Lg. | OD | For Motion Type | Material | Type | Thread Size | Each | Max. Speed, rpm | Max. Torque, in.-lbs. | Parallel | Angular | Temp. Range, °F | Each | ||
1/4"-7/8" | 2 1/8" | 1 3/4" | Continuous | Sintered Iron | Cup Point | 1/4"-20 | 00000000 | 000000 | 3,600 | 135 | 0.015" | 1° | -30° to 160° | 0000000 | 000000 |
1/4"-1" | 2 5/32" | 2 7/64" | Continuous | Sintered Iron | Cup Point | 1/4"-20 | 00000000 | 00000 | 3,600 | 210 | 0.015" | 1° | -30° to 160° | 0000000 | 00000 |
7/16"-1 1/8" | 2 1/2" | 2 7/64" | Continuous | Sintered Iron | Cup Point | 5/16"-18 | 00000000 | 00000 | 3,600 | 210 | 0.015" | 1° | -30° to 160° | 0000000 | 00000 |
7/16"-1 3/16" | 2 27/32" | 2 35/64" | Continuous | Sintered Iron | Cup Point | 5/16"-18 | 00000000 | 00000 | 3,600 | 475 | 0.015" | 1° | -30° to 160° | 0000000 | 00000 |
7/16"-1 3/8" | 3 31/64" | 2 35/64" | Continuous | Sintered Iron | Cup Point | 5/16"-18 | 00000000 | 00000 | 3,600 | 475 | 0.015" | 1° | -30° to 160° | 0000000 | 00000 |
5/8"-1 5/8" | 4 7/32" | 3 21/64" | Continuous | Sintered Iron | Cup Point | 5/16"-18 | 00000000 | 00000 | 3,600 | 1,185 | 0.015" | 1° | -30° to 160° | 0000000 | 000000 |
5/8"-1 7/8" | 4 1/2" | 3 3/4" | Continuous | Sintered Iron | Cup Point | 3/8"-16 | 00000000 | 000000 | 3,600 | 1,860 | 0.015" | 1° | -30° to 160° | 0000000 | 000000 |
Iron Hubs | Hytrel Spiders | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Set Screw | Misalignment Capability | ||||||||||||||
For Shaft Dia. | Overall Lg. | OD | For Motion Type | Material | Type | Thread Size | Each | Max. Speed, rpm | Max. Torque, in.-lbs. | Parallel | Angular | Temp. Range, °F | Each | ||
1/4"-5/8" | 1 23/32" | 1 5/64" | Continuous | Sintered Iron | Cup Point | 1/4"-20 | 00000000 | 00000 | 18,000 | 50 | 0.015" | 0.5° | -55° to 245° | 0000000 | 000000 |
1/4"-3/4" | 1 63/64" | 1 23/64" | Continuous | Sintered Iron | Cup Point | 1/4"-20 | 00000000 | 00000 | 3,600 | 110 | 0.015" | 0.5° | -55° to 245° | 0000000 | 00000 |
1/4"-7/8" | 2 1/8" | 1 3/4" | Continuous | Sintered Iron | Cup Point | 1/4"-20 | 00000000 | 00000 | 3,600 | 225 | 0.015" | 0.5° | -55° to 245° | 0000000 | 00000 |
1/4"-1" | 2 5/32" | 2 7/64" | Continuous | Sintered Iron | Cup Point | 1/4"-20 | 00000000 | 00000 | 3,600 | 400 | 0.015" | 0.5° | -55° to 245° | 0000000 | 00000 |
7/16"-1 1/8" | 2 1/2" | 2 7/64" | Continuous | Sintered Iron | Cup Point | 5/16"-18 | 00000000 | 00000 | 3,600 | 400 | 0.015" | 0.5° | -55° to 245° | 0000000 | 00000 |
7/16"-1 3/16" | 2 27/32" | 2 35/64" | Continuous | Sintered Iron | Cup Point | 5/16"-18 | 00000000 | 00000 | 3,600 | 790 | 0.015" | 0.5° | -55° to 245° | 0000000 | 000000 |
7/16"-1 3/8" | 3 31/64" | 2 35/64" | Continuous | Sintered Iron | Cup Point | 5/16"-18 | 00000000 | 00000 | 3,600 | 790 | 0.015" | 0.5° | -55° to 245° | 0000000 | 000000 |
5/8"-1 5/8" | 4 7/32" | 3 21/64" | Continuous | Sintered Iron | Cup Point | 5/16"-18 | 00000000 | 00000 | 3,600 | 2,265 | 0.015" | 0.5° | -55° to 245° | 0000000 | 000000 |
5/8"-1 7/8" | 4 1/2" | 3 3/4" | Continuous | Sintered Iron | Cup Point | 3/8"-16 | 00000000 | 000000 | 3,600 | 3,705 | 0.015" | 0.5° | -55° to 245° | 0000000 | 000000 |
3/4"-2 1/8" | 4 7/8" | 4 1/2" | Continuous | Sintered Iron | Cup Point | 1/2"-13 | 00000000 | 000000 | 5,000 | 4,680 | 0.015" | 0.5° | -55° to 245° | 0000000 | 000000 |
3/4"-2 5/8" | 5 11/32" | 5" | Continuous | Cast Iron | Cup Point | 1/2"-13 | 00000000 | 000000 | 4,200 | 6,225 | 0.015" | 0.5° | -55° to 245° | 0000000 | 000000 |
Machinable-Bore Single U-Joints


Customize the bores of these U-joints to fit the exact dimensions of your shafts. To make drilling easy, they come apart and have a small, centered starter hole on each end. They’re single U-joints, so they connect and transfer torque between two shafts that are misaligned at an angle. A good choice for most applications, all have a pin-and-block joint that handles higher torque at lower speeds than other joint types, such as those with needle bearings. Made of steel, they’re strong and handle a good amount of torque.
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). Drill holes through the U-joint and your shafts and then connect using spring pins.
Your shafts' misalignment will affect the speed and torque the U-joint will be able to transmit. The more the shafts are misaligned, the less speed and torque the U-joint will be able to transmit.
For technical drawings and 3-D models, click on a part number.
Torque | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
For Max. Shaft Dia. | For Max. Shaft Dp. | Joint Dia. | Overall Lg. | Max. Operating Angle | Max. Speed, rpm | Max. Torque, in.-lbs. | 3° Operating Angle | 10° Operating Angle | Joint Type | Each | |
Steel | |||||||||||
3/8" | 5/8" | 1/2" | 2" | 25° | 1,750 | 375 | 150 in.-lbs. @ 300 rpm | 51 in.-lbs. @ 300 rpm | Pin and Block | 0000000 | 0000000 |
1/2" | 11/16" | 5/8" | 2 1/4" | 25° | 1,750 | 540 | 245 in.-lbs. @ 300 rpm | 83 in.-lbs. @ 300 rpm | Pin and Block | 0000000 | 000000 |
5/8" | 7/8" | 3/4" | 2 11/16" | 25° | 1,750 | 765 | 330 in.-lbs. @ 300 rpm | 110 in.-lbs. @ 300 rpm | Pin and Block | 0000000 | 000000 |
Machinable-Bore Double U-Joints


Drill custom bore sizes to connect shafts that are either parallel to each other or are misaligned at an angle. These double U-joints come apart and have a small, centered hole on each end to make drilling easy. Besides transferring torque, they keep parallel shafts moving in sync by making the output shaft move at the same rate as the input shaft. They have a pin-and-block joint, so they handle higher torque at lower speeds than other joint types such as those with needle bearings, making them a good choice for most applications. Made of steel, they’re strong and handle a good amount of torque.
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). Drill holes through the U-joint and your shafts and then connect using spring pins.
Your shafts' misalignment will affect the speed and torque the U-joint will be able to transmit. The more the shafts are misaligned, the less speed and torque the U-joint will be able to transmit.
For technical drawings and 3-D models, click on a part number.
Torque | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
For Max. Shaft Dia. | For Max. Shaft Dp. | Joint Dia. | Overall Lg. | Max. Operating Angle | Max. Speed, rpm | Max. Torque, in.-lbs. | 3° Operating Angle | 10° Operating Angle | Parallel Misalignment Capability | Joint Type | Each | |
Steel | ||||||||||||
3/8" | 5/8" | 1/2" | 4" | 25° | 1,750 | 375 | 150 in.-lbs. @ 300 rpm | 51 in.-lbs. @ 300 rpm | 0.845" | Pin and Block | 0000000 | 0000000 |
1/2" | 11/16" | 5/8" | 4 1/2" | 25° | 1,750 | 540 | 245 in.-lbs. @ 300 rpm | 83 in.-lbs. @ 300 rpm | 0.951" | Pin and Block | 0000000 | 000000 |
5/8" | 7/8" | 3/4" | 5 3/8" | 25° | 1,750 | 765 | 330 in.-lbs. @ 300 rpm | 110 in.-lbs. @ 300 rpm | 1.133" | Pin and Block | 0000000 | 000000 |
3/4" | 1" | 1" | 6 3/4" | 25° | 1,750 | 1,560 | 595 in.-lbs. @ 300 rpm | 200 in.-lbs. @ 300 rpm | 1.428" | Pin and Block | 0000000 | 000000 |
1" | 1 1/16" | 1 1/4" | 7 1/2" | 25° | 1,750 | 5,220 | 980 in.-lbs. @ 300 rpm | 330 in.-lbs. @ 300 rpm | 1.585" | Pin and Block | 0000000 | 000000 |
1 1/8" | 1 3/16" | 1 1/2" | 8 1/2" | 25° | 1,750 | 7,920 | 1,425 in.-lbs. @ 300 rpm | 480 in.-lbs. @ 300 rpm | 1.796" | Pin and Block | 0000000 | 000000 |
Machinable Shaft Ends
One side is unfinished for milling custom pulleys, threaded hubs, sprockets, collars, knobs, sensor targets, or just about anything imaginable; the other side is a one-piece clamping coupling for mounting whatever you’ve created to your shaft. Slide these ends onto your shaft and tighten the clamping screws for a secure hold that won’t damage your shaft.
Use flanged ends to make objects with larger ODs than straight ends, or add mounting holes to create a custom mounting flange for connecting components.
Ends for keyed shafts have keyways that firmly grip the shaft’s key to eliminate slipping. They handle higher torque than ends for round shafts.
Carbon steel ends are easier to machine than stainless steel. They have a black-oxide finish that adds a layer of rust resistance but should be used in primarily dry environments.
Stainless steel ends provide the most corrosion resistance but are more difficult to machine than steel.
For technical drawings and 3-D models, click on a part number.




For Shaft Dia. | Overall Lg. | OD | For Motion Type | Each | |
Black-Oxide 1215 Carbon Steel | |||||
---|---|---|---|---|---|
For Keyed Shafts | |||||
1/2" | 2 3/4" | 1 1/4" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
5/8" | 3 1/4" | 1 1/2" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
3/4" | 4 1/4" | 1 3/4" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
7/8" | 4 3/8" | 1 7/8" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
1" | 4 3/4" | 2" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
1 1/8" | 4 3/4" | 2 1/8" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
1 1/4" | 5" | 2 1/4" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
1 3/8" | 5" | 2 3/8" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
1 1/2" | 5 3/8" | 2 1/2" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
1 3/4" | 6" | 3" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
2" | 6 3/4" | 3 1/4" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
For Round Shafts | |||||
1/2" | 2 3/4" | 1 1/4" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
5/8" | 3 1/4" | 1 1/2" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
3/4" | 4 1/4" | 1 3/4" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
7/8" | 4 3/8" | 1 7/8" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
1" | 4 3/4" | 2" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
1 1/8" | 4 3/4" | 2 1/8" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
1 1/4" | 5" | 2 1/4" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
1 3/8" | 5" | 2 3/8" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
1 1/2" | 5 3/8" | 2 1/2" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
1 3/4" | 6" | 3" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
2" | 6 3/4" | 3 1/4" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
303 Stainless Steel | |||||
For Keyed Shafts | |||||
1/2" | 2 3/4" | 1 1/4" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
5/8" | 3 1/4" | 1 1/2" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
3/4" | 4 1/4" | 1 3/4" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
7/8" | 4 3/8" | 1 7/8" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
1" | 4 3/4" | 2" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
1 1/8" | 4 3/4" | 2 1/8" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
1 1/4" | 5" | 2 1/4" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
1 3/8" | 5" | 2 3/8" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
1 1/2" | 5 3/8" | 2 1/2" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
1 3/4" | 6" | 3" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
2" | 6 3/4" | 3 1/4" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
For Round Shafts | |||||
1/2" | 2 3/4" | 1 1/4" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
5/8" | 3 1/4" | 1 1/2" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
3/4" | 4 1/4" | 1 3/4" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
7/8" | 4 3/8" | 1 7/8" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
1" | 4 3/4" | 2" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
1 1/8" | 4 3/4" | 2 1/8" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
1 1/4" | 5" | 2 1/4" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
1 3/8" | 5" | 2 3/8" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
1 1/2" | 5 3/8" | 2 1/2" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
1 3/4" | 6" | 3" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
2" | 6 3/4" | 3 1/4" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |



For Shaft Dia. | Overall Lg. | OD | Flange OD | For Motion Type | Each | |
Black-Oxide 1117 Carbon Steel | ||||||
---|---|---|---|---|---|---|
For Keyed Shafts | ||||||
1/2" | 1 11/16" | 1 1/4" | 2 15/64" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
3/4" | 2 1/16" | 1 3/4" | 2 63/64" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
1" | 2 1/4" | 2" | 3 15/64" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
For Round Shafts | ||||||
1/2" | 1 11/16" | 1 1/4" | 2 15/64" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
3/4" | 2 1/16" | 1 3/4" | 2 63/64" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
1" | 2 1/4" | 2" | 3 15/64" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
303 Stainless Steel | ||||||
For Keyed Shafts | ||||||
1/2" | 1 11/16" | 1 1/4" | 2 15/64" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
3/4" | 2 1/16" | 1 3/4" | 2 63/64" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
1" | 2 1/4" | 2" | 3 15/64" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
For Round Shafts | ||||||
1/2" | 1 11/16" | 1 1/4" | 2 15/64" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 00000 |
3/4" | 2 1/16" | 1 3/4" | 2 63/64" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
1" | 2 1/4" | 2" | 3 15/64" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |