HEX SLOTTED NUT DIMENSIONS TABLE

Hex slotted (castle) nut dimensions sizes table according to ASME B18.2.2 including width across flats (wrench size) and corners, flange diameter, nut thickness and slot width dimensions. All dimensions are in inches.

Hex Slotted Nut Dimensions
Castle Nut Size Chart
Nominal
 Size		 Basic
Major
Diameter
of
Thread 		 F G H T S
Width
Across
Flats		 Width
Across
Corners		 Thickness Unslotted
Thickness		 Width
of
Slot
Basic Min. Max. Min. Max. Basic Min. Max. Min. Max. Min. Max.
1/4 0.2500 7/16 0.428 0.438 0.488 0.505 7/32 0.212 0.226 0.12 0.14 0.07 0.10
5/16 0.3125 1/2 0.489 0.500 0.557 0.577 17/64 0.258 0.273 0.16 0.18 0.09 0.12
3/8 0.3750 9/16 0.551 0.562 0.628 0.650 21/64 0.320 0.337 0.19 0.21 0.12 0.15
7/16 0.4375 11/16 0.675 0.688 0.768 0.794 3/8 0.365 0.385 0.21 0.23 0.12 0.15
1/2 0.5000 3/4 0.736 0.750 0.840 0.866 7/16 0.427 0.448 0.27 0.29 0.15 0.18
9/16 0.5625 7/8 0.861 0.875 0.982 1.010 31/64 0.473 0.496 0.29 0.31 0.15 0.18
5/8 0.6250 15/16 0.922 0.938 1.051 1.083 35/64 0.535 0.559 0.32 0.34 0.18 0.24
3/4 0.7500 1 1/8 1.088 1.125 1.240 1.299 41/64 0.617 0.665 0.38 0.40 0.18 0.24
7/8 0.8750 1 5/16 1.269 1.312 1.447 1.516 3/4 0.724 0.776 0.49 0.52 0.18 0.24
1 1.0000 1 1/2 1.450 1.500 1.653 1.732 55/64 0.831 0.887 0.56 0.59 0.24 0.30
1 1/8 1.1250 1 11/16 1.631 1.688 1.859 1.949 31/32 0.939 0.999 0.61 0.64 0.24 0.33
1 1/4 1.2500 1 7/8 1.812 1.875 2.066 2.165 1 1/16 1.030 1.094 0.67 0.70 0.31 0.40
1 3/8 1.3750 2 1/16 1.994 2.062 2.273 2.382 1 11/64 1.138 1.206 0.78 0.82 0.31 0.40
1 1/2 1.5000 2 1/4 2.175 2.250 2.480 2.598 1 9/32 1.245 1.317 0.82 0.86 0.37 0.46
Nominal
 Size		 Basic
Major
Diameter
of
Thread  		 Basic Min. Max. Min. Max. Basic Min. Max. Min. Max. Min. Max.
Width
Across
Flats
[F]		 Width
Across
Corners
[G]		 Thickness [H] Unslotted
Thickness
[T]		 Width
of
Slot
[S]

Supplements:

Reference:

  • ASME B18.2.2-2010, Square and Hex Nuts (Inch Series)