HEX FLANGE NUT DIMENSIONS TABLE


Hex flange nut dimensions sizes table according to ASME B18.2.2. All dimensions are given in inches. Width across flats (wrench size) and corners, flange diameter, nut thickness, wrenching length and flange thickness are given.

Hex Flange Nut Dimensions
Nominal
 Size
Basic
Major
Diameter
of
Thread 
F G B H J K
Width
Across
Flats
Width
Across
Corners
Dia.
Flange
Thickness
Hex
Nut
Wrenching
Length
Flange
Thickness
min max. min. max. min. max. min. max. min. min.
Hex Flange Nuts
No.6 0.1380 0.302 0.312 0.342 0.361 0.406 0.422 0.156 0.171 0.10 0.02
8 0.1640 0.334 0.344 0.381 0.397 0.452 0.469 0.187 0.203 0.13 0.02
10 0.1900 0.365 0.375 0.416 0.433 0.480 0.500 0.203 0.219 0.13 0.03
12 0.2160 0.428 0.438 0.488 0.505 0.574 0.594 0.222 0.236 0.14 0.04
1/4 0.2500 0.428 0.438 0.488 0.505 0.574 0.594 0.222 0.236 0.14 0.04
5/16 0.3125 0.489 0.500 0.557 0.577 0.660 0.680 0.268 0.283 0.17 0.04
3/8 0.3750 0.551 0.562 0.628 0.650 0.728 0.750 0.330 0.347 0.23 0.04
7/16 0.4375 0.675 0.688 0.768 0.794 0.910 0.937 0.375 0.395 0.26 0.04
1/2 0.5000 0.736 0.750 0.840 0.866 1.000 1.031 0.437 0.458 0.31 0.05
9/16 0.5625 0.861 0.875 0.982 1.010 1.155 1.188 0.483 0.506 0.35 0.05
5/8 0.6250 0.922 0.938 1.051 1.083 1.248 1.281 0.545 0.569 0.40 0.05
3/4 0.7500 1.088 1.125 1.240 1.299 1.460 1.500 0.627 0.675 0.46 0.06
Large Hex Flange Nuts
Nominal
 Size
Basic
Major
Diameter
of
Thread 
F G B H J K
Width
Across
Flats
Width
Across
Corners
Dia.
Flange
Thickness
Hex
Nut
Wrenching
Length
Flange
Thickness
min max. min. max. min. max. min. max. min. min.
1/4 0.2500 0.428 0.438 0.488 0.505 0.700 0.728 0.281 0.312 0.15 0.04
5/16 0.3125 0.489 0.500 0.557 0.577 0.790 0.820 0.343 0.375 0.20 0.04
3/8 0.3750 0.551 0.562 0.628 0.650 0.885 0.915 0.390 0.406 0.24 0.04
7/16 0.4375 0.675 0.688 0.768 0.794 1.100 1.131 0.437 0.468 0.26 0.04
1/2 0.5000 0.736 0.750 0.840 0.866 1.175 1.205 0.485 0.515 0.29 0.06
9/16 0.5625 0.861 0.875 0.982 1.010 1.260 1.300 0.546 0.578 0.37 0.06
5/8 0.6250 0.922 0.938 1.051 1.083 1.280 1.360 0.600 0.640 0.42 0.06

Reference:

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