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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About Plain Bearings
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Oil-Embedded Thrust Bearings
Startup friction causes these porous bronze bearings to release a thin layer of oil on the bearing’s surface. They are also known as Oilite® bearings.
Note: Dynamic load capacity is the maximum load a bearing can withstand at a given shaft speed. If your application’s load and speed requirements are below the values listed, the bearing will work.
For technical drawings and 3-D models, click on a part number.
| OD | Thick. | Dynamic Thrust Load Capacity | Lubrication | Lubricant | Temperature Range, °F | Each | |
For 2 1/8" Shaft Dia. | |||||||
|---|---|---|---|---|---|---|---|
| 4" | 1/8" | 14,000 lbs. @ 30 rpm | Lubricated | SAE 30 Oil | -35° to 300° | 0000000 | 000000 |
High-Load Dry-Running Thrust Bearings
A steel backing adds strength to these slippery PTFE bearings.
Note: Dynamic load capacity is the maximum load a bearing can withstand at a given shaft speed. If your application’s load and speed requirements are below the values listed, the bearing will work.
For technical drawings and 3-D models, click on a part number.
| OD | Thick. | Dynamic Thrust Load Capacity | Temperature Range, °F | Each | |
Steel-Backed PTFE Plastic Bearings | |||||
|---|---|---|---|---|---|
For 2 1/8" Shaft Dia. | |||||
| 3 1/8" | 3/32" | 17,100 lbs. @ 30 rpm | -320° to 530° F° | 0000000 | 000000 |
Quick-Disconnect (QD) Bushings
The screw connections on these bushings easily mate to compatible quick-disconnect sprockets and pulleys. Bushings fit quick-disconnect (QD) sprockets and pulleys of the same bushing style. As you tighten the included screws, the bushing grips the shaft and pulls it into the sprocket or pulley.
For technical drawings and 3-D models, click on a part number.
Taper-Lock Bushings
Mount these hubless bushings flush into your sprocket or pulley for a slim profile with no protruding screws. They are for use with taper-lock sprockets of the same bushing style. As you tighten the included set screws, the bushing grips the shaft and pulls it into your sprocket or pulley.
For technical drawings and 3-D models, click on a part number.
Keyway | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| For Shaft Dia. | Overall Wd. | Wd. | Dp. | Taper | Fastener Tightening Torque, in.-lbs. | Material | Includes | Each | |
2012 Style Bushing | |||||||||
| 2 1/8" | 1 1/4" | 1/2" | 3/16" | 8° | 280 | Steel | Machine Key, Set Screws | 000000000 | 000000 |
2517 Style Bushing | |||||||||
| 2 1/8" | 1 3/4" | 1/2" | 1/4" | 8° | 430 | Steel | Set Screws | 000000000 | 00000 |
3020 Style Bushing | |||||||||
| 2 1/8" | 2" | 1/2" | 1/4" | 8° | 800 | Steel | Set Screws | 000000000 | 00000 |
Hub-Mount Screw-Clamp Bushings
Transfer torque directly from a shaft to a hub. These bushings install over your hub to mount a sprocket, pulley, or gear to a shaft at the same time. Common in industrial gearbox applications, they can also connect a hollow shaft over a solid shaft. As screw-clamp bushings, they're good for shock loads. When you tighten the included clamping screws, the outer rings compress against a sprocket, pulley, or gear in between them, causing the inner rings to tighten around the shaft.
For technical drawings and 3-D models, click on a part number.
| For Shaft Dia. | OD | Overall Wd. | Max. Torque, in.-lbs. | Fastener Tightening Torque, in.-lbs. | Material | Each | |
| 2 1/8" | 3 15/16" | 1 5/16" | 12,150 | 100 | Zinc-Plated Steel | 0000000 | 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 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 |
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 |
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 |
Shaft Grounding Rings
Prevent motor downtime by protecting bearings from stray currents generated by variable frequency drives. These grounding rings create a path for stray currents, so they won't damage bearing surfaces. Use them on AC motors.
One-piece rings slide on from the end of the shaft. Two-piece rings simplify installation when motors are connected to equipment.
Use epoxies to install rings without having to drill or tap into motor frames.
Apply shaft coatings to motor shafts before installing the rings to improve the conductivity of the steel shaft surface that touches the grounding ring.
For technical drawings and 3-D models, click on a part number.
