The specification should show the form of the part, state the material, specify dimensions and condition of symmetry.

D1 or D2 (not both)
D3
R1
R2
T
L1
L2
R3

D1 = Inside diameter at a plane of intersection
D2 = Outside diameter at a plane of intersection
D3 = Flange diameter at a plane of intersection
H = Depth of draw
L = Linear dimension
R1 = Punch radius
R2 = Die radius
R3 = Corner radius
S = 'Earing' due to directional property of material
T = material thickness

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