The Depth of Keyway in a Bore

Calculate the measurement of keyway depth from the opposite side of the bore. Although the metric and imperial systems differ, if you know the Keyway dimensions (H/2 and W), as shown in the picture below, it is possible to calculate the keyway depth with the bore (T) or vice versa.

• Find Key Depth (H/2)

• Fint Keyway (T)

Measured Bore Diameter (D):

Measured Keyway Width (W):

Measured Keyway Depth (T):

Keyway Depth (H/2)

Calculated Keyway Depth:

Measured Bore Diameter (D):

Measured Keyway Width (W):

Given Keyway Depth (H/2):

Keyway Depth with Bore (T)

From Opposite side of the Bore: