Torispherical Heads

(r1 = da, r2 = 0,1 da) Diameter: 21.3mm up to 1600mm
Hot or cold formed / annealed 

da = Outer diameter
h1 = Stepped-edge height
h2 = Dish height
h3 = Total height inner
r1 = Dish radius
r2 = Knuckle radius
s = Wall thickness