HEX FINISHED SLOTTED NUTS
HEAD DIMENSIONS
All Dimensions in Inches
Nominal Size or 
Basic Major Dia. of Thread
Width Across Flats Width Across Corners Thickness Unslotted Thickness Width of Slot
  Basic   Max. Min. Max. Min.   Basic   Max. Min. Max. Min. Max. Min.
1/4 0.2500 7/16 0.438 0.428 0.505 0.488 7/32 0.226 0.212 0.14 0.12 0.10 0.07
5/16 0.3125 1/2 0.500 0.489 0.557 0.557 17/64 0.273 0.258 0.18 0.16 0.12 0.09
3/8 0.3750 9/16 0.562 0.551 0.650 0.628 21/64 0.337 0.320 0.21 0.19 0.15 0.12
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
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
9/16 0.5625 7/8 0.875 0.861 1.010 0.982 31/64 0.496 0.473 0.31 0.29 0.18 0.15
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
3/4 0.7500 1-1/8 1.125 1.088 1.299 12.40 41/64 0.665 0.617 0.40 0.38 0.24 0.18
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
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
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
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
1-3/8 1.3750 2-1/16 2.062 1.994 2.382 2.273 1-11/64 1.206 1.138 0.82 0.78 0.40 0.31
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