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Keyways Index

Keys Strength Calculations


Key Capacity

Note: These calculations are approximate and take no allowance of factors of safety or fatigue considerations


To determine the torque capacity of key..
  • h = Depth of key (m)
  • r = Radius of shaft (m)
  • Le = Effective Length of key = Straight Length (m)
  • b = Breadth depth of key (m)
  • T = Torque capacity of key (N.m )
  • sc = Allowable compressive strength of key (N/m2)
  • t = Allowable shear strength of key (N/m2)

T = t .b . Le .r.....based on shear

T = sc .h . Le . r   /  2.....based on compressive strength


ISO straight sided Spline Capacity

  • r = Mean radius of spline (m)
  • n = Number of splines
  • Le = Effective Length of spline = Straight Length (m)
  • d = Depth of Spline (m)
  • T = Torque capacity of key (N.m )
  • sc = Allowable compressive strength of key (N/m2)
  • t = Allowable shear strength of key (N/m2)

T = sc . n .d . Le . r.....based on compressive strength

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Last Updated 08/02/2006