Slotted Hex Nuts
Hex Slotted Nuts     Hex Slotted Nuts
Slotted Hex Nuts
Nominal 
Size or 
Basic Major Diameter 
of Thread
F G H T S Runout of Bearing Surface FIM
Width Across Flats Width Across Corners Thickness Unslotted Thickness Width of Slot
Basic Max Min Max Min Basic Max Min Max Min Max Min Max
3/8 0.3750 9/16 0.562 0.551 0.650 0.628 21/64 0.337 0.320 0.21 0.19 0.150 0.12 0.018
7/16 0.4375 11/16 0.688 0.675 0.794 0.768 3/8 0.385 0.365 0.23 0.21 0.15 0.12 0.018
1/2 0.5000 3/4 0.750 0.736 0.866 0.840 7/16 0.448 0.427 0.29 0.27 0.18 0.15 0.019
5/8 0.6250 15/16 0.938 0.922 1.083 1.051 35/64 0.559 0.535 0.34 0.32 0.24 0.18 0.021
3/4 0.7500 1-1/8 1.125 1.088 1.299 1.240 41/64 0.665 0.617 0.40 0.38 0.24 0.18 0.023
7/8 0.8750 1-5/16 1.312 1.269 1.516 1.447 3/4 0.776 0.724 0.52 0.49 0.24 0.18 0.025
1 1.0000 1-1/2 1.500 1.450 1.732 1.653 55/64 0.887 0.831 0.59 0.56 0.30 0.24 0.027
1-1/8 1.1250 1-11/16 1.688 1.631 1.949 1.859 31/32 0.999 0.939 0.64 0.61 0.33 0.24 0.030
1-1/4 1.2500 1-7/8 1.875 1.812 2.165 2.066 1-1/16 1.094 1.030 0.70 0.67 0.40 0.31 0.033
1-1/2 1.5000 2-1/4 2.250 2.175 2.598 2.480 1-9/32 1.317 1.245 0.86 0.82 0.46 0.37 0.039