About Shaft Couplings
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About Shaft Collars
Shaft collars are useful for holding and positioning components on a shaft. They can also serve as mechanical stops and stroke limiters.
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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 | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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 1/8" | 0000000 | 0000000 | 5,000 | 1,725 | 0.015" | 1° | -40° to 212° | 0000000 | 000000 |
| 5 11/32" | 5" | Keyed | Forward/Reverse, Start/Stop | 2 1/8" | 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 1/8" | 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 1/8" | 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 | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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 1/8" | 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 1/8" | 000000 | 000000 | 6,000 | 7,065 | 0.038" | 2° | -60° to 212° | Red | 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 1/8" | 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 1/8" | 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 1/8" | 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 1/8" | 000000 | 000000 | 6,000 | 14,000 | 0.038" | 2° | -60° to 350° | White | 0000000 | 000000 | 0000000 | 000000 |
Shock-Absorbing Flexible Shaft Couplings
A strip of flexible spring steel wraps around the teeth of both hubs to absorb sharp, momentary load increases that can come from motor startups, emergency braking, or sudden impact with hard objects. When the shock load hits, the strip of spring steel (known as a grid) flexes to spread out the load. After the load passes, the grid straightens back out. They're commonly found in wire drawing and cutting machines, pulverizers, and mixers. Compared to spider couplings, jaw couplings, and other flexible shaft couplings, these handle higher torque while taking up less space. All have keyed bores to work with keyed shafts, which transmit higher torque with less slippage than round shafts.
A complete coupling consists of two hubs as well as a grid and cover assembly (all sold separately). The grid and cover assembly includes a spring steel grid, aluminum cover, rubber seals, and grease for lubrication. When ordering, please choose components that have the same manufacturer series number, otherwise the grid will not fit.
For technical drawings and 3-D models, click on a part number.
Grid and Cover Assemblies | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Hubs | Misalignment Capability | Replacement Grids | Replacement Seal Kits | |||||||||||||
| O'all Lg. | OD | For Motion Type | Mfr. Series | For Shaft Dia. | Each | Parallel | Angular | Max. Speed, rpm | Max. Torque, in.-lbs. | Each | Each | Each | ||||
Black-Oxide Steel | ||||||||||||||||
For Keyed Shaft | ||||||||||||||||
| 5 1/8" | 4 3/32" | Continuous, Forward/Reverse, Start/Stop | Martin (1060T) | 2 1/8" | 000000 | 0000000 | 0.016" | 0.25° | 4,350 | 6,050 | 00000000 | 0000000 | 00000000 | 0000000 | 00000000 | 000000 |
| Additional Grease (14 fl. oz. Grease Gun Cartridge) | 0000000 | Each | 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 | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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 1/8" | 0000000 | 000000 | 4,500 | 1,135 | 0.02" | 1° | 0.125" | -30° to 275° | TPE Rubber | 0000000 | 000000 |
| 5 1/16" | 6 23/64" | Continuous | Cast Iron | 2 1/8" | 000000 | 000000 | 3,750 | 1,800 | 0.025" | 1° | 0.125" | -30° to 275° | TPE Rubber | 0000000 | 00000 |
| 5 11/16" | 7 1/2" | Continuous | Cast Iron | 2 1/8" | 000000 | 000000 | 3,600 | 2,875 | 0.025" | 1° | 0.125" | -30° to 275° | TPE Rubber | 0000000 | 000000 |
| 7 1/8" | 8 5/8" | Continuous | Cast Iron | 2 1/8" | 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 | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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 1/8" | 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 | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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 1/8" | 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 1/8" | 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 Collars
These metal collars are stronger than plastic shaft collars. They clamp evenly around the shaft to create a strong, mar-free hold. To use, slide onto your shaft and tighten the clamping screw to secure.
Black-oxide steel collars have some corrosion resistance. Aluminum collars are lightweight and have good corrosion resistance.
For technical drawings and 3-D models, click on a part number.
Quick-Release Clamping Shaft Collars
Installing and removing a collar is as easy as pushing down and lifting up a clamp lever. Collars clamp evenly around the shaft to create a strong, mar-free hold. All have a clamping screw to adjust lever tension. Made of anodized aluminum, they are lightweight with good corrosion resistance.
For technical drawings and 3-D models, click on a part number.
Clamping Screw | Black Anodized 6061 Aluminum | |||||
|---|---|---|---|---|---|---|
| For Shaft Dia. | OD | Wd. | Type | No. Included | Each | |
| 2 1/8" | 4 3/4" | 3/4" | Socket Head Screw | 1 | 00000000 | 0000000 |
Set Screw Shaft Collars
Keep these shaft collars in place by tightening their set screw into the shaft. The tip of the screw digs in for a secure hold, but will mar the shaft’s surface. For maximum holding power, make sure the set screw material is harder than your shaft material. Use these shaft collars to position and retain power transmission components such as sprockets, pulleys, and bearings. You can also use them to limit the movement of a shaft.
Carbon steel collars are strong and wear resistant. Collars with a black-oxide finish have some corrosion resistance, but only in dry environments. Their dark color can be useful for matching other parts in your system. Collars with a zinc-plated finish have an outer layer of zinc that protects the steel from rust and extends the life of the collar. 303 stainless steel collars are corrosion resistant and highly machinable.
Aluminum collars are lightweight and have good corrosion resistance.
For technical drawings and 3-D models, click on a part number.
Clamping Two-Piece Shaft Collars
These metal collars are stronger than plastic shaft collars. The two-piece design allows you to install them anywhere on a shaft without removing components or having access to the ends of the shaft. Collars clamp evenly around the shaft to create a strong, mar-free hold. Tighten the clamping screws to secure.
Black-oxide steel collars have some corrosion resistance. Zinc-plated steel and chrome-plated steel collars have moderate corrosion resistance with a bright finish. Aluminum collars are lightweight and have good corrosion resistance. 303 stainless steel collars have excellent corrosion resistance. 316 stainless steel collars have excellent corrosion and chemical resistance.
For technical drawings and 3-D models, click on a part number.
Clamping Screw | ||||||
|---|---|---|---|---|---|---|
| For Shaft Dia. | OD | Wd. | Type | No. Included | Each | |
Black-Oxide 1215 Carbon Steel | ||||||
| 2 1/8" | 3 1/4" | 3/4" | Socket Head Screw | 2 | 0000000 | 000000 |
Zinc-Plated 1215 Carbon Steel | ||||||
| 2 1/8" | 3 1/4" | 3/4" | Socket Head Screw | 2 | 0000000 | 00000 |
Chrome-Plated 1215 Carbon Steel | ||||||
| 2 1/8" | 3 1/4" | 3/4" | Socket Head Screw | 2 | 0000000 | 00000 |
2024 Aluminum | ||||||
| 2 1/8" | 3 1/4" | 3/4" | Socket Head Screw | 2 | 00000000 | 00000 |
303 Stainless Steel  | ||||||
| 2 1/8" | 3 1/4" | 3/4" | Socket Head Screw | 2 | 00000000 | 00000 |
316 Stainless Steel | ||||||
| 2 1/8" | 3 1/4" | 3/4" | Socket Head Screw | 2 | 0000000 | 000000 |
Keyway | Clamping Screw | |||||||
|---|---|---|---|---|---|---|---|---|
| For Shaft Dia. | OD | Wd. | Wd. | Dp. | Type | No. Included | Each | |
Black-Oxide 1215 Carbon Steel | ||||||||
| 2 1/8" | 3 1/4" | 3/4" | 1/2" | 7/32" | Socket Head Screw | 2 | 0000000 | 000000 |
Set Screw Two-Piece Shaft Collars
Tighten the set screw to bite into an unhardened shaft for a secure hold. The two-piece design allows you to install these collars anywhere on a shaft without removing components or having access to the ends of the shaft. Clamping screws provide extra grip.
Carbon steel collars are strong and wear resistant. Their black-oxide finish is somewhat corrosion resistant, but only in dry environments. Their dark color can be useful for matching other parts in your system.
For technical drawings and 3-D models, click on a part number.
Set Screw | Clamping Screw | |||||||
|---|---|---|---|---|---|---|---|---|
| For Shaft Dia. | OD | Wd. | Type | No. Included | Type | No. Included | Each | |
Black-Oxide 1215 Carbon Steel | ||||||||
| 2 1/8" | 3 1/4" | 3/4" | Hex Socket | 1 | Socket Head Screw | 2 | 0000000 | 000000 |