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SP-Series Spring Clutches

SP-Series Spring Clutch Group

SP-Series Spring Clutches:

SP-Series Tiny-Clutches are versatile line of wrap spring clutches available in the following configurations: Overrunning, On-Off, Indexing, Adjustable Indexing & Positive Stop Indexing. The various configurations allow great flexibility in application. The basic spring clutch consists of three parts: an input hub, an output hub, and a spring. The greater the force the tighter the spring grips the hubs. When the rotation is reversed, the spring loosens its grip and slips. In the free direction there is slight drag caused by the spring being slightly smaller than the drums.

SP-Series Tiny-Clutches are available for shafts up to 16mm & torque loads up to 250lbs-in | 28.2Nm. Special input or output hubs are available upon request to suit customers' needs.  We will design & build special or modified clutches for your application using stock components.  Clutches can be supplied with gears, sprockets, pullies or as complete mechanical assemblies consisting of clutch, shaft and adjacent parts.

Standard SP-Series Clutches:

  Bore-Inch Bore-Metric
  Min. Max. Min. Max. Max. Torque Notes
SP40 1/8" 3/16" 3mm 5mm 5lbs-in | 0.6Nm Knurled or Plain Drum
SP50 1/8" 5/16" 3mm 8mm 15lbs-in | 1.7Nm Knurled or Plain Drum
SP56C 1/4" 5/16" 6mm 8mm 25lbs-in | 2.8Nm Knurled or Plain Drum
SP56D 1/4" 5/16" 6mm 8mm 25lbs-in | 2.8Nm 3-Hole Drum
SP75B 7/16" 1/2" 11mm 13mm 50lbs-in | 5.6Nm Knurled or Plain Drum
SP75C 5/16" 3/8" 8mm 10mm 50lbs-in | 5.6Nm Knurled or Plain Drum
SP75D 5/16" 3/8" 8mm 10mm 50lbs-in | 5.6Nm 3-Hole Drum
SP75E 7/16" 1/2" 11mm 13mm 50lbs-in | 5.6Nm 3-Hole Drum
SP93 3/8" 9/16" 9mm 14mm 60lbs-in | 6.8Nm Knurled or Plain Drum
SP100 3/8" 1/2" 9mm 13mm 250lbs-in | 28.2Nm 1" Knurled or Plain Drum
SP100A 3/8" 5/8" 9mm 16mm 250lbs-in | 28.2Nm 11/8" Knurled or Plain Drum
SP100B 3/8" 5/8" 9mm 16mm 250lbs-in | 28.2Nm 11/4" Knurled or Plain Drum
SP100C 3/8" 5/8" 9mm 16mm 250lbs-in | 28.2Nm 11/2" Knurled or Plain Drum
SP100D 3/8" 5/8" 9mm 16mm 250lbs-in | 28.2Nm 3-Hole Drum
Actuator Assembly Tiny-Clutch

We produce a range of solenoid actuator brackets available for each model of SP-Series clutches.  These brackets are an easy way to mount a solenoid, for applications requiring an electrical trigger. Contact Us for details.

Contact us during your design phase & we will help you
choose the right Clutch for your application!