Slotted Nuts are used for general purpose fastening and locking. The slots are for the insertion of a cotter pin or safety wire to secure the nut when used with a drilled shank fastener. The slotted and castle styles are both interchangeable with the slotted design now the preferred style.

Slotted Hex Nuts

Slotted Hex Nuts

Finish
Zinc, Cadmium, Nickel Silver & Chrome Plating, Black Oxide, Anodize, Passivation and Heat Treating.
Material
BS 2874 – CZ 121 Pb3 CZ 122 UNS C36000 CDA 360 DZR Brass BS 2874 – CZ 131 CW 614 N EN 12164 BS 2874 – CZ 114 BS 2874 – CZ 115

Nominal Sizeor Basic Major Diameter of Thread F G H T S Runout of Bearing Surface Max
Width Across Width Across Flats Corners Thickness Unslotted Tickness 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 0.014 0.012 0.100 0.070 0.015
5/16″ 0.3125 1/2″ 0.500 0.489 0.577 0.557 17/64″ 0.273 0.258 0.180 0.160 0.120 0.090 0.016
3/8″ 0.3750 9/16″ 0.562 0.551 0.650 0.628 21/64″ 0.337 0.320 0.210 0.190 0.150 0.120 0.017
7/16″ 0.4375 11/16″ 0.688 0.675 0.794 0.768 3/8″ 0.385 0.365 0.230 0.210 0.150 0.120 0.018
1/2″ 0.5000 3/4″ 0.750 0.736 0.866 0.840 7/16″ 0.448 0.427 0.290 0.270 0.180 0.150 0.019
9/16″ 0.5625 7/8″ 0.875 0.861 1.010 0.982 31/64″ 0.496 0.473 0.310 0.290 0.180 0.150 0.020
5/8″ 0.6250 15/16″ 0.938 0.922 1.083 1.051 35/64″ 0.559 0.535 0.340 0.320 0.240 0.180 0.021
3/4″ 0.7500 1-1/8″ 1.125 1.088 1.299 1.240 41/64″ 0.665 0.617 0.400 0.380 0.240 0.180 0.023
7/8″ 0.8750 1-5/16″ 1.312 1.269 1.516 1.447 3/4″ 0.776 0.724 0.520 0.490 0.240 0.180 0.025
1″ 1.0000 1-1/2″ 1.500 1.450 1.732 1.653 55/64″ 0.887 0.831 0.590 0.560 0.300 0.240 0.027
1-1/8″ 1.1250 1-11/16″ 1.688 1.631 1.949 1.859 31/32″ 0.999 0.939 0.640 0.610 0.330 0.240 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 0.700 0.670 0.400 0.310 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 0.820 0.780 0.400 0.310 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 0.860 0.820 0.460 0.370 0.039
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