ASTM Grade Size Area of minimum Rectangle Minimum dimension of one side
 
Square Inch
Equivalent Sq. Cm
Inch
Cm
OOEE SPECIAL 100 650 4 10.0
OOEE SPECIAL 80 520 4 10.0
EE SPECIAL 60 390 4 10.0
E SPECIAL 48 310 4 10.0
A-1 (SPECIAL) 36 235 8.8
NO. 1 24 155 3 8.8
NO. 2 15 97 2 5.0
NO. 3 10 65 2 5.0
NO. 4 6 40 3.8
NO. 5 3 20 1 2.5
NO. 5½ 15 2.2
NO. 6 1 6.5 ¾ 1.9
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