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Digit 1 part class
The Opitz codes of the round bar is 11103 2302 (Ham et al., 1985). The attributes are denoted as a1a9 for the round bar, a1=1 (Rotational parts, 0.5<L/D<3.) a2=1 (External shape element, stepped to one end.) a3=1 (Internal Shape element, smooth or stepped to one end.)
a=0 (No surface machining.)
a5=5 (Auxiliary holes, radial.) a6=2 (50 mm. < diameter <=100 mm.)
a7=3 (material is mild steel.)
a8=0 (Internal form: Round bar.)
a9=2 (Accuracy in coding digit.)

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