Altra Formsprag CL42153-2A Overrunning Clutch

Altra Formsprag CL42153-2A Overrunning Clutch is a bearing-supported one-way freewheel clutch from the Formsprag FSO family, specified as the FSO 400 with a 0.750 inch bore. The CL42153-2A designation identifies a 400-series clutch configured for high-speed overrunning service and designed to provide automatic engagement in the driving direction while allowing smooth overrunning when the input speed falls below the output. In operation, this clutch delivers a no-load start by delaying engagement, minimizes slip at rated speed, and offers protection against startup shocks as part of its standard performance envelope in the Formsprag line. Typical applications include conveyors and material handling drives, backstopping in power transmission systems, and other equipment where one-way torque transfer and controlled acceleration are critical, particularly in environments demanding reliability at higher overrunning speeds. The 0.750 in bore and 400-series platform place CL42153-2A within Formsprag’s bearing-supported freewheel clutch offerings, with a range of mounting, enclosure, and accessory options available to tailor the installation to a specific machine.