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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Maximum Torque Maximum Torque |
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Torque Limiter Type Torque Limiter Type |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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About Shaft Couplings
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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 | |||
2 9/16" | 2 13/32" | 4" | Continuous | 0000000 | 000000 | 5,000 | 1,355 | 0.012" | 2° | 40-2 | ANSI | 0000000 | 000000 | 0000000 | 0000000 | |
2 9/16" | 3 3/64" | 4" | Continuous | 0000000 | 00000 | 5,000 | 2,410 | 0.012" | 2° | 40-2 | ANSI | 0000000 | 00000 | 0000000 | 000000 | |
2 29/32" | 3 25/32" | 5 1/8" | Continuous | 0000000 | 00000 | 4,000 | 4,610 | 0.012" | 2° | 50-2 | ANSI | 0000000 | 00000 | 0000000 | 000000 | |
3 29/64" | 5" | 6 3/8" | Continuous | 0000000 | 00000 | 3,000 | 10,900 | 0.012" | 1.5° | 60-2 | ANSI | 0000000 | 00000 | 0000000 | 000000 |
Torque-Limiting Flexible Shaft Couplings



Protect shafts, motors, and gear boxes from damage that’s caused by torque overload from machine jams and emergency stops. If your set torque is exceeded, these couplings will disengage and then automatically re-engage once the torque is back within range. They handle more than five times as much torque as our other torque-limiting flexible shaft couplings. Connect them to your shafts with the included set screws, which bite into the shaft or shaft and key for a secure hold.
Single-spring couplings let you make finer torque adjustments than the double-spring couplings, but can only withstand half as much torque.
Double-spring couplings handle twice as much torque as the single-spring couplings, but are not the best for making precise adjustments at low torques.
Couplings for keyed shafts have keyways that are cut to standard ANSI dimensions, so they’ll fit snugly on ANSI keyed shafts to eliminate slipping during starts and stops.
For technical drawings and 3-D models, click on a part number.
Misalignment Capability | Roller Chain | ||||||||||||
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For Shaft Dia. | Max. Torque, ft.-lbs. | Max. Speed, rpm | Parallel | Angular | OD | Overall Lg. | Keyway Wd. × Keyway Dp. | Hub Material | Torque-Limiting Direction | Standard | Trade Size | Each | |
Single Spring | |||||||||||||
For Keyed Shafts | |||||||||||||
5/8" × 5/8" | 25 | 1,800 | 0.01" | 3° | 2 3/4" | 2 1/4" | 3/16" × 3/32" 3/16" × 3/32" | Steel | Clockwise and Counterclockwise | ANSI | 35-2 | 00000000 | 0000000 |
5/8" × 3/4" | 25 | 1,800 | 0.01" | 3° | 2 3/4" | 2 1/4" | 3/16" × 3/32" 3/16" × 3/32" | Steel | Clockwise and Counterclockwise | ANSI | 35-2 | 00000000 | 000000 |
3/4" × 3/4" | 25 | 1,800 | 0.01" | 3° | 2 3/4" | 2 1/4" | 3/16" × 3/32" 3/16" × 3/32" | Steel | Clockwise and Counterclockwise | ANSI | 35-2 | 00000000 | 000000 |
1" × 1" | 75 | 1,800 | 0.01" | 3° | 3 11/16" | 2 13/16" | 1/4" × 1/8" 1/4" × 1/8" | Steel | Clockwise and Counterclockwise | ANSI | 40-2 | 00000000 | 000000 |
12mm × 12mm | 25 | 1,800 | 0.01" | 3° | 2 3/4" | 2 1/4" | 4mm × 2mm 4mm × 2mm | Steel | Clockwise and Counterclockwise | ANSI | 35-2 | 00000000 | 000000 |
12mm × 15mm | 25 | 1,800 | 0.01" | 3° | 2 3/4" | 2 1/4" | 4mm × 2mm 5mm × 2.5mm | Steel | Clockwise and Counterclockwise | ANSI | 35-2 | 00000000 | 000000 |
15mm × 15mm | 25 | 1,800 | 0.01" | 3° | 2 3/4" | 2 1/4" | 5mm × 2.5mm 5mm × 2.5mm | Steel | Clockwise and Counterclockwise | ANSI | 35-2 | 00000000 | 000000 |
15mm × 20mm | 75 | 1,800 | 0.01" | 3° | 3 11/16" | 2 13/16" | 5mm × 2.5mm 6mm × 3mm | Steel | Clockwise and Counterclockwise | ANSI | 40-2 | 00000000 | 000000 |
20mm × 20mm | 75 | 1,800 | 0.01" | 3° | 3 11/16" | 2 13/16" | 6mm × 3mm 6mm × 3mm | Steel | Clockwise and Counterclockwise | ANSI | 40-2 | 00000000 | 000000 |
20mm × 25mm | 75 | 1,800 | 0.01" | 3° | 3 11/16" | 2 13/16" | 6mm × 3mm 8mm × 4mm | Steel | Clockwise and Counterclockwise | ANSI | 40-2 | 00000000 | 000000 |
25mm × 25mm | 75 | 1,800 | 0.01" | 3° | 3 11/16" | 2 13/16" | 8mm × 4mm 8mm × 4mm | Steel | Clockwise and Counterclockwise | ANSI | 40-2 | 00000000 | 000000 |
For Round Shaft × For Keyed Shaft | |||||||||||||
1/2" × 5/8" | 25 | 1,800 | 0.01" | 3° | 2 3/4" | 2 1/4" | 3/16" × 3/32" | Steel | Clockwise and Counterclockwise | ANSI | 35-2 | 00000000 | 000000 |
1/2" × 3/4" | 25 | 1,800 | 0.01" | 3° | 2 3/4" | 2 1/4" | 3/16" × 3/32" | Steel | Clockwise and Counterclockwise | ANSI | 35-2 | 00000000 | 000000 |
For Round Shafts | |||||||||||||
1/2" × 1/2" | 25 | 1,800 | 0.01" | 3° | 2 3/4" | 2 1/4" | __ | Steel | Clockwise and Counterclockwise | ANSI | 35-2 | 00000000 | 000000 |
Double Spring | |||||||||||||
For Keyed Shafts | |||||||||||||
5/8" × 5/8" | 50 | 1,800 | 0.01" | 3° | 2 3/4" | 2 1/4" | 3/16" × 3/32" 3/16" × 3/32" | Steel | Clockwise and Counterclockwise | ANSI | 35-2 | 00000000 | 000000 |
5/8" × 3/4" | 50 | 1,800 | 0.01" | 3° | 2 3/4" | 2 1/4" | 3/16" × 3/32" 3/16" × 3/32" | Steel | Clockwise and Counterclockwise | ANSI | 35-2 | 00000000 | 000000 |
3/4" × 3/4" | 50 | 1,800 | 0.01" | 3° | 2 3/4" | 2 1/4" | 3/16" × 3/32" 3/16" × 3/32" | Steel | Clockwise and Counterclockwise | ANSI | 35-2 | 00000000 | 000000 |
1" × 1" | 150 | 1,800 | 0.01" | 3° | 3 11/16" | 2 13/16" | 1/4" × 1/8" 1/4" × 1/8" | Steel | Clockwise and Counterclockwise | ANSI | 40-2 | 00000000 | 000000 |
12mm × 12mm | 50 | 1,800 | 0.01" | 3° | 2 3/4" | 2 1/4" | 4mm × 2mm 4mm × 2mm | Steel | Clockwise and Counterclockwise | ANSI | 35-2 | 00000000 | 000000 |
12mm × 15mm | 50 | 1,800 | 0.01" | 3° | 2 3/4" | 2 1/4" | 4mm × 2mm 5mm × 2.5mm | Steel | Clockwise and Counterclockwise | ANSI | 35-2 | 00000000 | 000000 |
15mm × 15mm | 50 | 1,800 | 0.01" | 3° | 2 3/4" | 2 1/4" | 5mm × 2.5mm 5mm × 2.5mm | Steel | Clockwise and Counterclockwise | ANSI | 35-2 | 00000000 | 000000 |
15mm × 20mm | 150 | 1,800 | 0.01" | 3° | 3 11/16" | 2 13/16" | 5mm × 2.5mm 6mm × 3mm | Steel | Clockwise and Counterclockwise | ANSI | 40-2 | 00000000 | 000000 |
20mm × 20mm | 150 | 1,800 | 0.01" | 3° | 3 11/16" | 2 13/16" | 6mm × 3mm 6mm × 3mm | Steel | Clockwise and Counterclockwise | ANSI | 40-2 | 00000000 | 000000 |
20mm × 25mm | 150 | 1,800 | 0.01" | 3° | 3 11/16" | 2 13/16" | 6mm × 3mm 8mm × 4mm | Steel | Clockwise and Counterclockwise | ANSI | 40-2 | 00000000 | 000000 |
25mm × 25mm | 150 | 1,800 | 0.01" | 3° | 3 11/16" | 2 13/16" | 8mm × 4mm 8mm × 4mm | Steel | Clockwise and Counterclockwise | ANSI | 40-2 | 00000000 | 000000 |
For Round Shaft × For Keyed Shaft | |||||||||||||
1/2" × 5/8" | 50 | 1,800 | 0.01" | 3° | 2 3/4" | 2 1/4" | 3/16" × 3/32" | Steel | Clockwise and Counterclockwise | ANSI | 35-2 | 00000000 | 000000 |
1/2" × 3/4" | 50 | 1,800 | 0.01" | 3° | 2 3/4" | 2 1/4" | 3/16" × 3/32" | Steel | Clockwise and Counterclockwise | ANSI | 35-2 | 00000000 | 000000 |
For Round Shafts | |||||||||||||
1/2" × 1/2" | 50 | 1,800 | 0.01" | 3° | 2 3/4" | 2 1/4" | __ | Steel | Clockwise and Counterclockwise | ANSI | 35-2 | 00000000 | 000000 |