CH Technical Data for Wet or Dry Operation

Modified Standards Available

Higher torque ranges, actuation pressures, and stronger release springs are available to meet customer’s specific design  requirements. Contact Logan for more details.

 Modified CH 1250 diagram

Duty SF
Suggested Service Factor Table
Small Inertia Low Cycle Rate Non-pulsating Load 1.3 to 1.7
Large Inertia Low Cycle Rate Non-pulsating Load 1.7 to 2.2
Small Inertia High Cycle Rate Pulsating Load 2.2 to 3.2

*  Data shown is subject to change.  Please consult factory for current dimensional data. 


Selection Procedures

I Calculate the torque requirement for the application using one of the following formula

Torque (Lb./In.) = HP* 63025/RPM
Tc (Nm.) = HP* 9550/RPM

II Identify the service factor which best identifies your application from the suggested service factor table.

III Adjust the torque requirement using the selected service factor.

Gross Torque Capacity (T) / Safety Factor (SF)

T= Tc x SF or T=Tb x SF

IV. Determine if the model will:
1) Accommodate the shaft and key
2) Operate at the required speed
3) Fit within the available space

V. Determine the Drive Ring Mounting

Vl. Complete the Application Fact Sheet
provided in this brochure or complete online
at Call, e-mail, or
Fax your application and place your order.

HP = Horsepower
RPM = Clutch or Brake shaft speed
WR2 = Total inertia to be stopped (Ib.ft.2)
T = Required Torque (Lb./ Ft., Nm, Lb./in)
Tc = Clutch Torque (Lb./ Ft., Nm, Lb./in)
Tb = Brake Torque (Lb./ Ft., Nm, Lb./in)
t = Time to stop (seconds)
SF = Service Factor


Torque & Horsepower Formulas

HP = T(Lb./Ft.)*RPM /5250
Torque (Lb./Ft.) = HP*5250/RPM

HP = T(Lb./Ft.)* RPM / 63025
Torque (Lb./In.) = HP * 63025 / RPM

HP = T(Nm..) x RPM /9950
Torque (Nm.) = HP*9950/RPM


Torque Conversion Calculators
Newton meters (Nm.) to Pound inches (
Pound inches ( to Newton meters (Nm.)
Newton meters (Nm.) to Pounds feet (lb. ft.)
Pounds feet (lb.ft.) to Newton meters (Nm)

Horsepower Conversion Calculators
Horsepower (HP) to kW (Kilowatt)
Kilowatt (kW) to Horsepower (HP)

Pressure Conversion Calculators
Bar to pounds per square inch (psi)
Pounds per square inch (psi) to Bar

Measurement Conversion Table
Millimeters (mm) to Inches (in)
Inches (in) to Millimeters (mm)

Weight Conversion Table
Pounds (lbs.) to Kilograms (Kg.)
Kilograms (Kg.) to Pounds (lbs.)







Literature Download

Free Subscription!

Join our list and receive our email newsletter.

Powered by Virteom