LCB Series Fan Backstops | Formsprag Clutch

Models LCB-200 and 400 are economical, low-torque clutches designed to prevent problems associated with windmilling in fan applications. Units can be installed on vertical or horizontal fan shafts without the use of a key. The clutches can accommodate a range of shaft diameters between 1-7/8” and 5”. Units are maintenance-free and easy to install.

Product Features

  • Wide speed range between 0 and (LCB-200 3600/ LCB-400 1800 RPM).
  • Wide temperature operating range between -13 and 194 °F (-25 and 90 °C).
  • Wide bore range for fan shaft (LCB-200 Max 3.5”/ LCB-400 Max 5”) (89mm and 127mm).
  • Torque capacity (LCB-200 150 lb.ft (200Nm)/ LCB-400 850 lb.ft (1150Nm).
  • Drag torque, negligible, < 1.78 (20 Ncm)
  • Easy to install requiring only LCB-200 1.125” and LCB-400 2” of shaft engagement.
  • Lubricated for life (no maintenance required).
  • Bearing life L10 is over 200 years.
  • Compact design with only LCB-200 2-7/8”/ LCB-400 4.95” required space beyond the shaft end of the fan.
  • Self actuated with no power or utility required to operate.
  • Shaft mounted design has been tested to over 200% torque capacity.
  • Flexible torque arm design.
  • Meets ISO “G” 30 Balance

Product Data Sheets


Click on image below to download pdf. To order hard copies of literature click here.

Product Catalog

Overrunning, Indexing, Backstopping Clutches

Service Manual

Fan Backstops LCB-200 & LCB-400 Service & Install

Related Literature

LCB-200 & 400 Fan Backstops Formsprag Clutch Line Card Heavy Duty & Overrunning Clutch Brake Group Overview HDOCB Engineering Capabilities

Contact Info

Formsprag Clutch
23601 Hoover Rd.
Warren, MI 48089 - USA
Toll Free: 1-800-348-0881 (Press #1)
Phone: 586-758-5000
Fax: 586-758-5204

Formsprag Clutch LCB Backstop