CR = 0,8D_o
KR = 0,154D_o
SF = 3t or per request
DH = 0,255D_o – 0,635t
TH_i = SF+DH

D₀ = external head diameter
D_i = internal head diameter
CR = crown radius
KR = knuckle radius
SF = straight flange height
DH = depth of dishing
TH_i = total internal head height
t = wall thickness