TABLE OF CONTENTS | a | addendum for a flat root involute spline profile, m (in) | |
| A | area, m 2 (in 2) | |
| b | breadth of key, m (in) effective length of knuckle pin, m (in) dedendum for a flat root involute spline profile, m (in) | |
| d | diameter, m (in) | |
| d 1 | major diameter of internal spline, m (in) | |
| d 2 | minor diameter of internal spline, m (in) | |
| d 3 | major diameter of external spline, m (in) | |
| d 4 | minor diameter of external spline, m (in) | |
| d c | core diameter of threaded portion of the taper rod, m (in) | |
| d pl | large diameter of taper pin, m (in) | |
| d m (or d pm) | mean diameter of taper pin, m (in) | |
| d nom | nominal diameter of thread portion, m (in) | |
| D | diameter of shaft, m (in) pitch diameter, m (in) | |
| F | force, kN (lbf) force on the cotter joint, kN (lbf) pressure between hub and key, kN (lbf) | |
| F ? F ? | force applied in the center of plane of a feather keyed shaft which do not change the existing equilibrium but give a couple, kN (lbf) | |
| F ? 2 F ? 2 | two opposite forces applied on the center plane of a double feather keyed shaft which give two couples, but tending to rotate the hub clockwise, kN (lbf) | |
| F t | tangential force, kN (lbf) | |
| F ? | frictional... |
