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Castle Nuts
Castle Nuts

Welcome

Castle Nuts

Castle Nuts are similar to a slotted nut with the following exception: the slots are cut into cylindrical portion that is equal in length to the slot depth and slightly smaller in diameter than the hex width.

The slots are for the insertion of a cotter pin to secure the nut when used with s drilled shank fastener. The slotted and castle styles are both interchangeable with the slotted design now the preferred style.
Materials
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
Finishes Zinc, Cadmium, Nickel Silver & Chrome Plating, Black Oxide, Anodize, Passivation and Heat Treating.

Castle Hex Nuts ANSI B18.2.2
Nominal Size or Basic Major 
Diameterof Thread
F G H T S R W Runout of Bearing Surface
Width Across Flats Width Across Corners Thickness Unslotted Thickness and Height of Flat Width of Slots Radius of Filet Diam of Cylindre.
Basic Max Min Max Min Basic Max Min Nom Max Min Max Min + 0.01 Min Max
1/4" 0.2500 7/16" 0.438 0.428 0.505 0.488 9/32" 0.288 0.274 3/16" 0.200 0.180 0.100 0.070 0.094 0.371 0.015
5/16" 0.3125 1/2" 0.500 0.489 0.577 0.557 21/64" 0.336 0.320 15/64" 0.240 0.220 0.120 0.090 0.094 0.425 0.016
3/8" 0.3750 9/16" 0.562 0.551 0.650 0.628 13/32" 0.415 0.398 9/32" 0.290 0.270 0.150 0.120 0.094 0.478 0.017
7/16" 0.4375 11/16" 0.688 0.675 0.794 0.768 29/64" 0.463 0.444 19/64" 0.310 0.290 0.150 0.120 0.094 0.582 0.018
1/2" 0.5000 3/4" 0.750 0.736 0.866 0.840 9/16" 0.573 0.552 13/32" 0.420 0.400 0.180 0.150 0.125 0.637 0.019
9/16" 0.5625 7/8" 0.875 0.861 1.010 0.982 39/64" 0.621 0.598 27/64" 0.430 0.410 0.180 0.150 0.156 0.744 0.020
5/8" 0.6250 15/16" 0.938 0.922 1.083 1.051 23/32" 0.731 0.706 1/2" 0.510 0.490 0.240 0.180 0.156 0.797 0.021
3/4" 0.7500 1-1/8" 1.125 1.088 1.299 1.240 13/16" 0.827 0.798 9/16" 0.570 0.550 0.240 0.180 0.188 0.941 0.023
7/8" 0.8750 1-5/16" 1.312 1.269 1.516 1.447 29/32" 0.922 0.890 21/32" 0.670 0.640 0.240 0.180 0.188 1.097 0.025
1" 1.0000 1-1/2" 1.500 1.450 1.732 1.653 1" 1.018 0.982 23/32" 0.730 0.700 0.300 0.240 0.188 1.254 0.027
1-1/8" 1.1250 1-11/16" 1.688 1.631 1.949 1.859 1-5/32" 1.176 1.136 13/16" 0.830 0.800 0.330 0.240 0.250 1.411 0.030
1-1/4" 1.2500 1-7/8" 1.875 1.812 2.165 2.066 1-1/4" 1.272 1.228 7/8" 0.890 0.860 0.400 0.310 0.250 1.570 0.033
1-3/8" 1.3750 2-1/16" 2.062 1.994 2.382 2.273 1-3/8" 1.399 1.351 1" 1.020 0.980 0.400 0.310 0.250 1.726 0.036
1-1/2" 1.5000 2-1/4" 2.250 2.175 2.598 2.480 1-1/2" 1.526 1.474 1-1/16" 1.080 1.040 0.460 0.370 0.250 1.881 0.039

 
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