About Shaft Couplings
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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.
Buna-N spiders provide good vibration damping and chemical resistance. Hytrel spiders provide fair vibration damping and excellent chemical resistance.
For technical drawings and 3-D models, click on a part number.
Buna-N Rubber Spiders | |||||||||||||
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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 | ||
4 7/8" | 4 1/2" | Keyed | Forward/Reverse, Start/Stop | 2" | 0000000 | 0000000 | 5,000 | 1,725 | 0.015" | 1° | -40° to 212° | 0000000 | 000000 |
5 11/32" | 5" | Keyed | Forward/Reverse, Start/Stop | 2" | 0000000 | 000000 | 4,200 | 2,340 | 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 | ||
4 7/8" | 4 1/2" | Keyed | Forward/Reverse, Start/Stop | 2" | 0000000 | 0000000 | 5,000 | 4,680 | 0.015" | 0.5° | -55° to 245° | 0000000 | 0000000 |
5 11/32" | 5" | Keyed | Forward/Reverse, Start/Stop | 2" | 0000000 | 000000 | 4,200 | 6,225 | 0.015" | 0.5° | -55° to 245° | 0000000 | 000000 |
High-Torque Set Screw Flexible Shaft Couplings


The thick split spider on these couplings takes on twice as much torque as standard split spiders, while a set screw holds the hubs in place on your shaft. Also known as jaw couplings, use them to connect motors to pumps, mixers, and other high-torque equipment. You don’t need to lubricate them.
For a complete coupling, you’ll need two hubs, one split spider, and a split spider cover (all sold separately).
Hubs attach to the end of your shaft.
Split spiders cushion between the two hubs to dampen vibration, reduce shocks, and handle shaft misalignment, extending the life of bearings, seals, and motors. You can replace them without having to remove the hubs or move your shaft and equipment around, which reduces the risk of needing to realign the shaft. Spiders with medium-soft hardness are the most commonly used and are good for applications that start, stop, and reverse often. Those with medium hardness handle higher torque than those with medium-soft hardness, but they don’t reduce vibration as well.
Split spider covers hold the spider in place.
For technical drawings and 3-D models, click on a part number.
Urethane Split Spiders | |||||||||||||||
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Steel Hubs | Misalignment Capability | Steel Split Spider Covers | |||||||||||||
Overall Lg. | OD | For Motion Type | For Shaft Dia. | Each | Max. Speed, rpm | Max. Torque, in.-lbs. | Parallel | Angular | Temp. Range, °F | Color | Each | Each | |||
4 29/32" | 3 3/16" | Forward/Reverse, Start/Stop | 2" | 000000 | 0000000 | 7,000 | 3,425 | 0.039" | 2° | -60° to 212° | Red | 0000000 | 000000 | 0000000 | 000000 |
6 1/16" | 3 33/64" | Forward/Reverse, Start/Stop | 2" | 000000 | 000000 | 6,000 | 7,065 | 0.038" | 2° | -60° to 212° | Red | 0000000 | 00000 | 0000000 | 000000 |
Urethane Split Spiders | |||||||||||||||
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Steel Hubs | Misalignment Capability | Steel Split Spider Covers | |||||||||||||
Overall Lg. | OD | For Motion Type | For Shaft Dia. | Each | Max. Speed, rpm | Max. Torque, in.-lbs. | Parallel | Angular | Temp. Range, °F | Color | Each | Each | |||
4 29/32" | 3 3/16" | Forward/Reverse, Start/Stop | 2" | 000000 | 0000000 | 7,000 | 6,460 | 0.039" | 2° | -60° to 212° | Blue | 0000000 | 000000 | 0000000 | 000000 |
6 1/16" | 3 33/64" | Forward/Reverse, Start/Stop | 2" | 000000 | 000000 | 6,000 | 14,000 | 0.038" | 2° | -60° to 212° | Blue | 0000000 | 00000 | 0000000 | 000000 |
Urethane Split Spiders | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Steel Hubs | Misalignment Capability | Steel Split Spider Covers | |||||||||||||
Overall Lg. | OD | For Motion Type | For Shaft Dia. | Each | Max. Speed, rpm | Max. Torque, in.-lbs. | Parallel | Angular | Temp. Range, °F | Color | Each | Each | |||
4 29/32" | 3 3/16" | Forward/Reverse, Start/Stop | 2" | 000000 | 0000000 | 7,000 | 6,460 | 0.039" | 2° | -60° to 350° | White | 0000000 | 0000000 | 0000000 | 000000 |
6 1/16" | 3 33/64" | Forward/Reverse, Start/Stop | 2" | 000000 | 000000 | 6,000 | 14,000 | 0.038" | 2° | -60° to 350° | White | 0000000 | 000000 | 0000000 | 000000 |
High-Speed Vibration-Damping Flexible Shaft Couplings


Use these gear-shaped couplings for high-speed and high-torque applications. A rubber center allows flexing so couplings can take on multiple types of misalignment while damping vibration and shock. With no metal-to-metal contact, there’s no need for lubrication. 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 center (each component sold separately).
Hubs have a keyway, except hubs for 1/4" and 3/8" shaft dia. do not have a keyway.
For technical drawings and 3-D models, click on a part number.
Centers | |||||||||||||||
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Hubs | Misalignment Capability | ||||||||||||||
O'all Lg. | OD | For Motion Type | Material | For Shaft Dia. | Each | Max. Speed, rpm | Max. Torque, in.-lbs. | Parallel | Angular | Axial | Temp. Range, °F | Material | Each | ||
4 7/16" | 5 29/64" | Continuous | Cast Iron | 2" | 0000000 | 000000 | 4,500 | 1,135 | 0.02" | 1° | 0.125" | -30° to 275° | TPE Rubber | 0000000 | 000000 |
5 11/16" | 7 1/2" | Continuous | Cast Iron | 2" | 000000 | 000000 | 3,600 | 2,875 | 0.025" | 1° | 0.125" | -30° to 275° | TPE Rubber | 0000000 | 00000 |
7 1/8" | 8 5/8" | Continuous | Cast Iron | 2" | 000000 | 000000 | 3,600 | 4,530 | 0.032" | 1° | 0.125" | -30° to 275° | EPDM Rubber | 0000000 | 000000 |
High-Torque Flexible Shaft Couplings


With a rugged roller-chain design, these couplings provide excellent torque and angular misalignment capacities. Lubrication is required. Fasten to your shaft by tightening the set screws, which bite into the shaft to hold it.
A complete coupling consists of two hubs and one roller chain (each component sold separately). Complete couplings meet ANSI B29.23M-1995.
Optional covers retain grease lubrication and provide protection from abrasion and corrosion.
For technical drawings and 3-D models, click on a part number.
Steel Roller Chain | ||||||||||||||||
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Steel Hubs | Misalignment Capability | Roller Chain | Orange Nylon Plastic Covers | |||||||||||||
O'all Lg. | OD | OD with Cover | For Motion Type | For Shaft Dia. | Each | Max. Speed, rpm | Max. Torque, in.-lbs. | Parallel | Angular | No. | Standard | Each | Each | |||
3 29/64" | 5" | 6 3/8" | Continuous | 2" | 0000000 | 000000 | 3,000 | 10,900 | 0.012" | 1.5° | 60-2 | ANSI | 0000000 | 000000 | 0000000 | 0000000 |
Ultra-High-Torque Flexible Shaft Couplings


With a rigid gear design, these steel couplings transmit more torque than other couplings of the same size. Lubrication is required. To install, heat the hubs to expand them slightly and fit them onto the shaft. When they cool, hubs shrink to fit the shaft tightly.
A complete coupling consists of two hubs, one sleeve, and one seal kit (each component sold separately).
For technical drawings and 3-D models, click on a part number.
Steel Sleeves | |||||||||||||||
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Steel Hubs | Misalignment Capability | Seal Kits | |||||||||||||
O'all Lg. | OD | For Motion Type | For Shaft Dia. | Each | Max. Speed, rpm | Max. Torque, in.-lbs. | Parallel | Angular | Axial | Each | Includes | Each | |||
4 1/4" | 4 3/4" | Continuous | 2" | 0000000 | 0000000 | 4,200 | 20,200 | 0.007" | 1° | 0.03" | 0000000 | 0000000 | Two Buna-N Rubber Lubrication Seals, Two Steel Snap Rings | 0000000 | 000000 |
4 3/4" | 5 1/2" | Continuous | 2" | 0000000 | 000000 | 3,750 | 30,200 | 0.007" | 1° | 0.05" | 0000000 | 000000 | Two Buna-N Rubber Lubrication Seals, Two Steel Snap Rings | 0000000 | 000000 |
Clamping Shaft Couplings


Designed to grip evenly around your shaft, clamping couplings provide more holding power than set screw couplings without marring the shaft. Slide onto the end of your shaft and tighten the clamping screws to secure. Good for high-torque applications, rigid couplings connect two shafts that are aligned, allowing for no relative movement between the shafts.
Stainless steel couplings have excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.
For Shaft Dia. | Overall Lg. | OD | Max. Speed, rpm | Max. Torque, in.-lbs. | For Motion Type | Each | |
Steel | |||||||
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For Keyed Shafts | |||||||
2" × 2" | 4 7/8" | 3 3/8" | 4,000 | 20,250 | Forward/Reverse, Start/Stop, Continuous | 000000000 | 0000000 |
For Round Shafts | |||||||
2" × 2" | 4 7/8" | 3 3/8" | 4,000 | 20,250 | Forward/Reverse, Start/Stop, Continuous | 000000000 | 000000 |
303 Stainless Steel | |||||||
For Keyed Shafts | |||||||
2" × 2" | 4 7/8" | 3 3/8" | 4,000 | 6,100 | Forward/Reverse, Start/Stop, Continuous | 000000000 | 000000 |
For Round Shafts | |||||||
2" × 2" | 4 7/8" | 3 3/8" | 4,000 | 6,100 | Forward/Reverse, Start/Stop, Continuous | 000000000 | 000000 |
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.
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 | |||||||
2" × 0.485"-2.000" | 4 7/8" | 3 1/4" | Not Rated | 6,430 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 0000000 |
For Round Shafts | |||||||
2" × 0.485"-2.000" | 4 7/8" | 3 1/4" | Not Rated | 4,825 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 000000 |
High-Grip Clamping Shaft Couplings

These couplings have the gripping strength to handle higher torque than most other couplings. Couplings clamp evenly around the shaft to create a mar-free hold. Slide onto the end of your shaft and tighten the clamping screws to secure. Good for high-torque applications, rigid couplings connect two shafts that are aligned, allowing for no relative movement between the shafts.
For technical drawings and 3-D models, click on a part number.
For Shaft Dia. | Overall Lg. | OD | Max. Speed, rpm | Max. Torque, in.-lbs. | For Motion Type | Each | |
Steel | |||||||
---|---|---|---|---|---|---|---|
For Round Shafts | |||||||
2" | 6" | 3 1/2" | 3,500 | 10,955 | Forward/Reverse, Start/Stop, Continuous | 000000 | 0000000 |
Two-Piece Shaft Couplings
Install and remove these shaft couplings without disconnecting the shafts, motors, and other attached components—they’re made in two pieces so you don’t need to slide them onto shaft ends. They’re also useful when you have limited access to the ends of the shafts. These couplings clamp onto the shafts, creating a secure hold that won’t mar them. Good for high-torque applications, they have a rigid construction. However, their rigidity means these couplings can only connect shafts that are well aligned.
Couplings for keyed shafts have keyways that are cut to standard ANSI dimensions, so they fit snugly on ANSI keyed shafts to eliminate slipping during starts and stops.
Steel couplings are stronger and handle higher torque loads than aluminum and stainless steel couplings.
303 stainless steel couplings resist corrosion, so they’re often used in wet conditions, such as with mixers and pumps.
For technical drawings and 3-D models, click on a part number.


For Shaft Dia. | Overall Lg. | OD | Max. Speed, rpm | Max. Torque, in.-lbs. | For Motion Type | Each | |
Black-Oxide Steel | |||||||
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For Keyed Shafts | |||||||
2" × 2" | 4 7/8" | 3 3/8" | 4,000 | 13,600 | Forward/Reverse, Start/Stop, Continuous | 00000000 | 0000000 |
For Round Shafts | |||||||
2" × 2" | 4 7/8" | 3 3/8" | 4,000 | 13,600 | Forward/Reverse, Start/Stop, Continuous | 00000000 | 000000 |
303 Stainless Steel | |||||||
For Keyed Shafts | |||||||
2" × 2" | 4 7/8" | 3 3/8" | 4,000 | 6,100 | Forward/Reverse, Start/Stop, Continuous | 00000000 | 000000 |
For Round Shafts | |||||||
2" × 2" | 4 7/8" | 3 3/8" | 4,000 | 6,100 | Forward/Reverse, Start/Stop, Continuous | 00000000 | 000000 |
Two-Piece Shaft Coupling Bridges

When your shafts are not close enough to use standard couplings, these have the length to bridge the gap. Install them anywhere on a shaft without removing components or having access to the ends of the shaft. Tighten the clamping screws to secure. Good for high-torque applications, rigid couplings connect two shafts that are aligned, allowing for no relative movement between the shafts.
For technical drawings and 3-D models, click on a part number.
For Shaft Dia. | Overall Lg. | OD | Max. Speed, rpm | Max. Torque, in.-lbs. | For Motion Type | Each | |
Cast Iron | |||||||
---|---|---|---|---|---|---|---|
For Keyed Shafts | |||||||
2" | 8 5/8" | 5 1/2" | 3,635 | 8,500 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 0000000 |
High-Grip Two-Piece Shaft Couplings

These couplings have the gripping strength to handle higher torque than most other couplings. Install them anywhere on a shaft without removing components or having access to the ends of the shaft. Tighten the clamping screws to secure. Good for high-torque applications, rigid couplings connect two shafts that are aligned, allowing for no relative movement between the shafts.
For technical drawings and 3-D models, click on a part number.
For Shaft Dia. | Overall Lg. | OD | Max. Speed, rpm | Max. Torque, in.-lbs. | For Motion Type | Each | |
Steel | |||||||
---|---|---|---|---|---|---|---|
For Round Shafts | |||||||
2" | 6" | 3 1/2" | 3,500 | 13,150 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 0000000 |
Keyless Locking Shaft Couplings for Overhung Loads

Support the weight of a motor and transfer torque to another shaft at the same time with these couplings. Often used to hang motors from conveyor belts and other driven equipment, or to connect long sections of shafts, these couplings eliminate the need for support brackets. Use a torque arm to prevent hanging motors from spinning.
The clamping screws on the coupling face squeeze two outer collars against an inner ring, pressing it tight against shafts to lock them together. This ring-locking mechanism leaves no room for backlash, meaning that all of the turning force created by the motor is passed on to the second shaft. These couplings grip shafts of any shape, so you can install them onto existing keyways and splines without using a key.
To install these couplings, use a torque wrench to tighten each screw to the fastener tightening torque listed for each coupling size. To remove, gradually loosen each screw in sequence until you can slide the coupling on the shaft. Warning: Do not remove any clamping screws from the coupling until the outer collars are separated from the inner ring. The ring is under tension, and a sudden release of the collars can cause serious injury.
Overhung load capacity is the amount of downward force that a coupling can withstand from a motor or other object that it is supporting. To calculate the overhung load, measure the distance from the center of the coupling to the center of gravity of the motor. Multiply that distance by the combined weight of the motor and the portion of the shaft between the coupling and the motor. Do not exceed the overhung load capacity for a coupling.
For technical drawings and 3-D models, click on a part number.
For Shaft Dia. | Overall Lg. | OD | Max. Speed, rpm | Max. Torque, in.-lbs. | Fastener Tightening Torque, in.-lbs. | Overhung Load Cap., in.-lbs. | For Motion Type | Each | |
Steel | |||||||||
---|---|---|---|---|---|---|---|---|---|
2" | 2 11/16" | 4 7/16" | 7,700 | 32,685 | 264 | 8,170 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 0000000 |
Three-Piece Shaft Couplings

Access one shaft without disconnecting the other. These rigid couplings have a solid bottom that connects the shafts and two top pieces that clamp the shafts independently.
Black-oxide steel couplings are stronger than stainless steel couplings but should be used in primarily dry environments since they may rust.
For technical drawings and 3-D models, click on a part number.
For Shaft Dia. | Overall Lg. | OD | Max. Speed, rpm | Max. Torque, in.-lbs. | For Motion Type | Each | |
Black-Oxide Steel | |||||||
---|---|---|---|---|---|---|---|
For Keyed Shafts | |||||||
2" × 2" | 4 7/8" | 3 1/4" | 4,000 | 12,360 | Forward/Reverse, Start/Stop, Continuous | 0000000 | 0000000 |
Shaft Coupling Covers

Extend the life of your rigid shaft couplings by blocking out dirt, water, lubricants, and other contaminants. These two-piece covers twist together to form a shell around the coupling. Viton® fluoroelastomer O-rings on the threads and around each shaft complete the seal. The outer surface is knurled for a good grip when tightening by hand. Covers are only for use with round, unkeyed shafts.
For Shaft Dia. | Overall Lg. | OD | For Motion Type | Each | |
Acetal Plastic | |||||
---|---|---|---|---|---|
For Round Shafts | |||||
2" × 2" | 5 3/16" | 3 3/4" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 0000000 |
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.
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 | |||||
2" | 6 3/4" | 3 1/4" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 0000000 |
For Round Shafts | |||||
2" | 6 3/4" | 3 1/4" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
303 Stainless Steel | |||||
For Keyed Shafts | |||||
2" | 6 3/4" | 3 1/4" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |
For Round Shafts | |||||
2" | 6 3/4" | 3 1/4" | Continuous, Forward/Reverse, Start/Stop | 0000000 | 000000 |