List of symbols

Symbol	Name of the symbol	Unit
$C_1$	coefficient $ C_1 $	$\mathrm{}$
$C_2$	coefficient $ C_2 $	$\mathrm{}$
$C_3$	coefficient $ C_3 $	$\mathrm{}$
$C_4$	coefficient $ C_4 $	$\mathrm{}$
$D$	diameter, larger diameter	$\mathrm{mm}$
$H$	width, larger width	$\mathrm{mm}$
$K_t$	stress concentration factor	$\mathrm{ }$
$L$	length or shoulder width	$\mathrm{mm}$
$M$	moment	$\mathrm{Nm}$
$P$	load, force	$\mathrm{N}$
$T$	torque	$\mathrm{Nm}$
$d$	diameter	$\mathrm{mm}$
$d$	width	$\mathrm{mm}$
$h$	thickness	$\mathrm{mm}$
$r$	radius of curvature of hole, arc, notch	$\mathrm{mm}$
$t$	depth of groove, notch	$\mathrm{mm}$
$σ_{max}$	maximum normal stress	$\mathrm{MPa}$
$σ_{nom}$	nominal or reference normal stress	$\mathrm{MPa}$