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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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.
Parallel couplings have short, intermittent cuts that make them more rigid and able to handle more torque and speed than spiral couplings, but they’re worse at correcting misalignment. Use them in high-torque applications, such as linear test systems and scientific instruments. They’re sometimes called slit couplings.
Aluminum couplings are lightweight with good corrosion resistance. Stainless steel couplings offer excellent 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  | ||||||||||
| 7mm × 1/4" | 30mm | 25mm | 6,000 | 27 | 0.38mm | 3° | 0.25mm | Forward/Reverse, Start/Stop | 0000000 | 000000 |
| 7mm × 3/8" | 30mm | 25mm | 6,000 | 27 | 0.38mm | 3° | 0.25mm | Forward/Reverse, Start/Stop | 0000000 | 00000 |
| 7mm × 6mm | 30mm | 25mm | 6,000 | 27 | 0.38mm | 3° | 0.25mm | Forward/Reverse, Start/Stop | 0000000 | 00000 |
| 7mm × 7mm | 30mm | 25mm | 6,000 | 27 | 0.38mm | 3° | 0.25mm | Forward/Reverse, Start/Stop | 0000000 | 00000 |
| 8mm × 7mm | 30mm | 25mm | 6,000 | 27 | 0.38mm | 3° | 0.25mm | Forward/Reverse, Start/Stop | 0000000 | 00000 |
| 9mm × 7mm | 30mm | 25mm | 6,000 | 27 | 0.38mm | 3° | 0.25mm | Forward/Reverse, Start/Stop | 0000000 | 00000 |
| 10mm × 7mm | 30mm | 25mm | 6,000 | 27 | 0.38mm | 3° | 0.25mm | Forward/Reverse, Start/Stop | 0000000 | 00000 |
303 Stainless Steel | ||||||||||
| 7mm × 10mm | 30mm | 25mm | 6,000 | 40 | 0.38mm | 3° | 0.25mm | Forward/Reverse, Start/Stop | 00000000 | 000000 |
Parallel Cut | ||||||||||
7075 Aluminum | ||||||||||
| 7mm × 5mm | 19.8mm | 16mm | 10,000 | 11.1 | 0.1mm | 2.5° | 0.4mm | Forward/Reverse, Start/Stop | 00000000 | 000000 |
| 7mm × 5mm | 21.5mm | 20mm | 7,500 | 21.7 | 0.12mm | 3° | 0.5mm | Forward/Reverse, Start/Stop | 00000000 | 000000 |
| 7mm × 7mm | 19.8mm | 16mm | 10,000 | 11.1 | 0.1mm | 2.5° | 0.4mm | Forward/Reverse, Start/Stop | 0000000 | 000000 |
| 10mm × 7mm | 34mm | 25mm | 5,000 | 34.5 | 0.4mm | 3° | 0.7mm | Forward/Reverse, Start/Stop | 00000000 | 000000 |
Clamping Vibration-Damping 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. Good for precision motor and pump applications, the spider-shaped cushion reduces shock and compensates for minor shaft misalignment. Couplings allow zero backlash (no play).
A complete coupling consists of two hubs and one spider (each component sold separately). Hubs are lightweight, corrosion-resistant aluminum. Spiders are polyurethane for fair vibration damping and good chemical resistance.
For technical drawings and 3-D models, click on a part number.
Durometer 98A Polyurethane Spiders | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2024 Aluminum 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 7/64" | 3/4" | Round | Forward/Reverse, Start/Stop | 7mm | 000000 | 000000 | 8,000 | 30 | 0.003" | 0.8° | 0° to 180° | 0000000 | 000000 |
| 1 13/32" | 1" | Round | Forward/Reverse, Start/Stop | 7mm | 000000 | 00000 | 8,000 | 150 | 0.003" | 0.8° | 0° to 180° | 0000000 | 00000 |
Durometer 92A Polyurethane Spiders | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2024 Aluminum 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 7/64" | 3/4" | Round | Forward/Reverse, Start/Stop | 7mm | 000000 | 000000 | 8,000 | 18 | 0.004" | 0.9° | 0° to 180° | 0000000 | 000000 |
| 1 13/32" | 1" | Round | Forward/Reverse, Start/Stop | 7mm | 000000 | 00000 | 8,000 | 58 | 0.005" | 0.9° | 0° to 180° | 0000000 | 00000 |
Durometer 85A Polyurethane Spiders | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2024 Aluminum 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 7/64" | 3/4" | Round | Forward/Reverse, Start/Stop | 7mm | 000000 | 000000 | 8,000 | 10 | 0.005" | 1° | 0° to 180° | 0000000 | 000000 |
| 1 13/32" | 1" | Round | Forward/Reverse, Start/Stop | 7mm | 000000 | 00000 | 8,000 | 30 | 0.006" | 1° | 0° to 180° | 0000000 | 00000 |
Set Screw Vibration-Damping Precision Flexible Shaft Couplings
The included set screw holds the coupling in place. Good for precision motor and pump applications, the spider-shaped cushion reduces shock and compensates for minor shaft misalignment. Couplings allow zero backlash (no play).
A complete coupling consists of two hubs and one spider (each component sold separately). Hubs are lightweight, corrosion-resistant aluminum. Spiders are polyurethane for fair vibration damping and good chemical resistance.
For technical drawings and 3-D models, click on a part number.
Durometer 98A Polyurethane Spiders | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2024 Aluminum 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 | ||
| 27mm | 19mm | Round | Continuous, Forward/Reverse, Start/Stop | 7mm | 0000000 | 000000 | 8,000 | 30 | 0.003" | 0.8° | 0° to 180° | 0000000 | 000000 |
Durometer 92A Polyurethane Spiders | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2024 Aluminum 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 | ||
| 27mm | 19mm | Round | Continuous, Forward/Reverse, Start/Stop | 7mm | 0000000 | 000000 | 8,000 | 18 | 0.004" | 0.9° | 0° to 180° | 0000000 | 000000 |
Durometer 85A Polyurethane Spiders | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2024 Aluminum 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 | ||
| 27mm | 19mm | Round | Continuous, Forward/Reverse, Start/Stop | 7mm | 0000000 | 000000 | 8,000 | 10 | 0.005" | 1° | 0° to 180° | 0000000 | 000000 |
High-Speed Servomotor Precision Flexible Shaft Couplings
Connect shafts and ball screws to high-speed servomotors and stepper motors—these shaft couplings handle four times more speed than standard servomotor couplings. They’re often found on high-torque motors that frequently start and stop, such as those used with packaging machines, press brakes, and semiconductor manufacturing equipment.
With aluminum hubs joined by a flexible fluoroelastomer or nitrile rubber core, these shaft couplings dampen vibration and adjust for misalignment. When machines accelerate and decelerate quickly, these couplings remain stiff to maintain accuracy and repeatability, which prevents equipment from moving out of place. They also resist backlash, meaning all of the turning force from the motor is passed on to the connected shaft. The core resists water, petroleum-based chemicals, and inorganic acids while also insulating bearings, encoders, and other shaft components from stray electric current. Clamping screws provide hold without marring shafts; they’re useful in applications where shafts are frequently assembled and disassembled.
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 | |
2017 Aluminum with Fluoroelastomer Rubber Center | ||||||||||
| 5mm × 7mm | 1 1/32" | 3/4" | 30,000 | 18 | 0.006" | 1.5° | 0.008" | Forward/Reverse, Start/Stop | 0000000 | 000000 |
| 6mm × 7mm | 1 1/32" | 3/4" | 30,000 | 18 | 0.006" | 1.5° | 0.008" | 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.
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 | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Steel Hubs | Misalignment Capability | ||||||||||||
| Overall Lg., mm | OD, mm | For Shaft Type | For Motion Type | For Shaft Dia., mm | Each | Max. Speed, rpm | Max. Torque, in.-lbs. | Parallel | Angular | Temp. Range, °F | Each | ||
| *Not drilled or tapped for set screw. Set screw not included. | |||||||||||||
| 44 | 27 | Round | Forward/Reverse, Start/Stop | 7 | 00000000 | 00000 | 18,000 | 26 | 0.015" | 1° | -40° to 212° | 0000000 | 00000 |
Hytrel Rubber Spiders | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Steel Hubs | Misalignment Capability | ||||||||||||
| Overall Lg., mm | OD, mm | For Shaft Type | For Motion Type | For Shaft Dia., mm | Each | Max. Speed, rpm | Max. Torque, in.-lbs. | Parallel | Angular | Temp. Range, °F | Each | ||
| *Not drilled or tapped for set screw. Set screw not included. | |||||||||||||
| 44 | 27 | Round | Forward/Reverse, Start/Stop | 7 | 00000000 | 00000 | 18,000 | 50 | 0.015" | 0.5° | -55° to 245° | 0000000 | 000000 |
Clamping High-Parallel-Misalignment 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. Also known as Oldham couplings, they have a slotted disc that allows hubs to slide independently—good for applications with parallel shaft misalignment. They also allow zero backlash (no play) and never need lubrication.
A complete coupling consists of two hubs and one disc (each component sold separately).
Aluminum hubs are lightweight and have good corrosion resistance. Stainless steel hubs offer excellent corrosion resistance.
Acetal discs stand up to high twisting forces. Nylon discs have excellent vibration and shock absorption. PEEK discs have excellent impact resistance and the chemical resistance to withstand a variety of acids and other harsh substances.
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. 303 stainless steel collars have excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.
Washdown Clamping Shaft Collars
Suitable for use in washdown applications, these plastic collars also offer good chemical resistance. 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.
Acetal collars have a naturally slippery surface and resist swelling when exposed to moisture.
For technical drawings and 3-D models, click on a part number.
Clamping Screw | White Acetal Plastic | |||||
|---|---|---|---|---|---|---|
| For Shaft Dia., mm | OD, mm | Wd., mm | Type | No. Included | Each | |
| 7 | 18 | 9 | Socket Head Screw | 1 | 00000000 | 000000 |
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 that are blue make it easy to identify metric collars at a glance. They’re tinted to match other blue metric fasteners.
303 stainless steel collars are corrosion resistant and highly machinable.
DIN 705 collars meet an international standard for shaft collar dimensions.
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. In addition to the benefits of aluminum, anodized aluminum collars have extra corrosion resistance, and you can tighten the clamping screw with more torque, so they stay in place. 316 stainless steel collars have excellent corrosion and chemical resistance.
For technical drawings and 3-D models, click on a part number.
Washdown Clamping Two-Piece Shaft Collars
Suitable for use in washdown applications, these plastic collars also offer good chemical resistance. 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.
Acetal collars have a naturally slippery surface and resist swelling when exposed to moisture.
For technical drawings and 3-D models, click on a part number.
Clamping Screw | White Acetal Plastic | |||||
|---|---|---|---|---|---|---|
| For Shaft Dia., mm | OD, mm | Wd., mm | Type | No. Included | Each | |
| 7 | 18 | 9 | Socket Head Screw | 2 | 0000000 | 000000 |