หัวน๊อต ASTM A563

D (DIAMETER)  M12 M14 M16 M20 M22 M24 M27 M30 M36
P (PICTH) 1.75 2.0 2.0 2.5 2.5 3.0 3.0 3.5 4.0
K (HEAD THICKNESS)  12 14 16 20 22 24 28 30 36
S (WIDTH ACROSS FLAT)  22  24  27  34  36  41  46  50  60
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