FORMSPRAG

Formsprag sleeve bearing supported clutches are available with static torque ratings from 40 ft-lb to 450 ft-lb. The FSR-3 model provides 40 ft-lb, the FSR-5 offers 110 ft-lb, the FSR-6 delivers 300 ft-lb, and the FSR-8 is rated at 450 ft-lb. These ratings indicate the maximum torque the clutch can transmit without slipping. Actual application torque should be within the rated capacity, considering factors such as safety factors and dynamic loads. The torque rating is a key specification for selecting the appropriate clutch for overrunning, backstopping, or indexing duties.

The Formsprag FSR series sleeve bearing supported clutches come in bore sizes of 3/8 inch, 1/2 inch, 3/4 inch, and 1 inch. The FSR-3 has a 3/8 inch bore, the FSR-5 has a 1/2 inch bore, the FSR-6 has a 3/4 inch bore, and the FSR-8 has a 1 inch bore. These bore sizes accommodate common shaft diameters in industrial machinery. The clutch mounts on a shaft extension, and the bore must match the shaft diameter for proper fit and torque transmission. When ordering, verify the shaft size and keyway dimensions to ensure compatibility.

Overrunning, backstopping, and indexing are three distinct functions that Formsprag sprag clutches can perform. Overrunning allows the clutch to transmit torque in one direction while freewheeling in the opposite direction, useful in dual-drive systems. Backstopping prevents reverse rotation of a shaft, commonly used on inclined conveyors to hold loads when power is removed. Indexing provides intermittent motion by engaging and disengaging at precise intervals, often in feed mechanisms. The same clutch design can often serve multiple functions depending on how it is installed and controlled. Formsprag sleeve bearing supported clutches are suitable for all three applications.

Yes, Formsprag sleeve bearing supported clutches are totally enclosed. The enclosure protects the internal sprag mechanism and bearings from dust, dirt, moisture, and other contaminants. This makes them suitable for use in environments where exposure to particles or liquids could degrade performance. The totally enclosed design also reduces maintenance requirements, as the lubricant is retained within the unit. These clutches are often used in outdoor or washdown applications where open clutches would be vulnerable. The enclosure does not affect the torque capacity or operating principle of the clutch.

Formsprag sleeve bearing supported clutches are designed for use with HPI series equipment. They mount on a shaft extension and are commonly found in power transmission systems that require overrunning, backstopping, or indexing. Typical equipment includes conveyors, pumps, mixers, and other industrial machinery. The clutch's compatibility depends on the shaft diameter, torque requirement, and mounting configuration. When replacing a clutch, verify the model number and specifications to ensure a proper fit. 3G Electric can assist with cross-referencing and selection for specific HPI series applications.

Selecting a Formsprag clutch involves determining the required function (overrunning, backstopping, or indexing), the maximum torque, the shaft diameter, and the operating environment. Calculate the torque demand of your application, including any shock loads, and choose a clutch with a static torque rating exceeding that value. Match the bore size to your shaft diameter. Consider the speed and duty cycle, as these affect bearing life and heat generation. For contaminated environments, the totally enclosed sleeve bearing supported series is appropriate. Consult the specification tables for model numbers like FSR-3, FSR-5, FSR-6, and FSR-8. 3G Electric can provide detailed data and application support.