HEX NUT ANSI B 18.2.4.1M unit : mm Nominal Nut Dia & Thread Pitch S E M Width Across Flats Width Across Comers Thickness Max Min Max Min Max Min M1.6 X 0.35 M2 X 0.4 M2.5 X 0.45 M3 X 0.5 3.20 4.00 5.00 5.50 3.02 3.82 4.82 5.32 3.70 4.62 5.77 6.35 3.41 4.32 5.45 6.01 1.30 1.60 2.00 2.40 1.05 1.35 1.75 2.15 M3.5 X 0.6 M4 X 0.7 M5 X 0.8 M6 X 1 6.00 7.00 8.00 10.00 5.82 6.78 7.78 9.78 6.93 8.08 9.2..