Coupling Selection Calculator
Select a shaft coupling by calculating design torque with service factor, required rating, and recommended coupling type based on misalignment.
Inputs
ft·lb
RPM
in
°
in
Results
Design Torque
750 ft·lb
Recommended Type
Jaw or Disc
Required Rating9,000 in·lb
Coupling OD (est.)5.8 in
Max Bore Diameter2.61 in
Transmitted Power171.36 HP
How to Use This Calculator
- Enter the steady-state Transmitted Torque in ft·lb — calculate it as T = 5252 × HP / RPM if starting from motor power.
- Set the Shaft Speed in RPM and the Shaft Diameter in inches (use the larger shaft if the two sides differ).
- Enter the expected Angular Misalignment in degrees and Parallel (Offset) Misalignment in inches.
- Set the Service Factor based on load type: 1.0–1.5 for uniform loads, 1.5–2.0 for moderate shock, 2.0–3.0 for heavy shock.
- Review the Recommended Type (Rigid, Jaw, Elastomeric, etc.) and the Required Rating in in·lb to match against catalog data.
- Confirm the Coupling OD estimate and Max Bore Diameter are compatible with your shaft and housing clearances.
Ad Placeholder
Related Calculators
Shaft Design Calculator
Design a shaft for combined bending and torsional loads using the von Mises failure criterion. Calculates minimum diameter and stresses.
Keyway Design Calculator
Design shaft keyways by calculating shear and compressive stresses in the key. Determine minimum key length and safety factor.
Gear Ratio Calculator
Calculate gear ratio, output speed, output torque, and mechanical advantage for a simple gear pair.
Ad Placeholder