Hex Castle Nuts: Dimensions & Specifications

Hex Castle Nuts Drawing

Hex Castle Nuts: Dimensions (ANSI B18.2.2 1970)

Nominal or Basic Major Diameter of Thread

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 Width Across Flats (F)

 Width Across Corners (G)     Thickness (H)
 Unslotted Thickness (T) Width of Slot (S) Radius of Filet (R) Diam. of Cylindrical Part (W) Runout of Bearing Surface FIR
Basic Max Min  Max  Min Basic  Max Min  Nom Max Min Max Min +.010 Min Max
1/4 0.2500 7/16 0.438 0.428 0.505 0.488 9/32 0.288 0.274 3/16 0.20 0.18 0.10 0.07 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 0.24 0.22 0.12 0.09 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 0.29 0.27 0.15 0.12 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 0.31 0.29 0.15 0.12 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 0.42 0.40 0.18 0.15 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 0.43 0.41 0.18 0.15 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 0.51 0.49 0.24 0.18 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 0.57 0.55 0.24 0.18 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 0.67 0.64 0.24 0.18 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 0.73 0.70 0.30 0.24 0.188 1.254 0.027
1-1/4 1.1250 1-7/8 1.875 1.812 2.165 2.066 1-1/4 1.272 1.228 7/8 0.89 0.86 0.40 0.31 0.250 1.570 0.033

 

 

Description Similar to a slotted nut, with the exception of cutting the slots into a cylindrical part equal in size to the depth of
the slot and slightly lower in diameter than the hex width.
Applications The slots are used with a drilled shank fastener to insert a cotter pin to
secure the nut. The slotted and castle styles are now the preferred style
that can be interchanged with the slotted model.		 Offers the same benefits as low carbon
castle nut but can be used
with bolts and cap screws of Grade-5.
Material

Low Carbon Steel

 Grade-5

Nuts are produced of low-carbon steel that meets the following
requirements for chemical composition - Carbon:0.47% max.;
Phosphorus: 0.12% max.; Sulfur: 0.23% max.

SAE 1010 - 1022 steel
Hardness

Rockwell C32 maximum

SAE 1010 - 1022 steel
Proof Load

-

 Rockwell C32 maximum
Plating See table above for more information.



 

NOTE: Grade-5 Castle nut output is not an industry norm. As a recommendation, these values are provided as recommended.
Parts should be screened before making final suitability assessments in real apps.