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Nuts

Castle Nuts

Dimensions of Hex Slotted Nuts

Nominal Size or
Basic Major
Diameter of Thread		 F G H T S  
Width Across Flats Width Across Corners Thickness Unslotted Thickness Width of Slot Runout of Bearing
Surface to Thread
Axis, FIM
Basic Max Min Max Min Basic Max Min Max Min Max Min Max
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 0.015
5/16 (0 .3125) 1/2 0.500 0.489 0.577 0.557 17/64 0.273 0.258 0.18 0.16 0.12 0.09 0.016
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 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
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 0.020
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
1-3/8 (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 0.036
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