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Castle Nuts

Castle Nuts

The cylindrical tops of these nuts feature six milled slots for use with cotter pins, to securely hold nuts and keep them from turning. Available in plain steel and stainless steel in fine thread Stocked in tap sizes from 1/4-28 to 21/2-12.

Group codes represented: CTN
Part# examples: 100UCTN, 87SCTN

Nominal Size or Basic Major Diameter of Threads
F
G
H
T
S
R
W
Runout of Bearing Surface FIR
Width Across Flats
Width Across corners
Thickness
Unslotted Thickness and height of Flat
Width of Slot
Radius of Filet
Dia. of Cylind rical
Basic
Max
Min
Max
Min
Basic
Max
Min
Nom
Max
Min
Max
Min
+ or - .010
Min
Max
5/8
0.625
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
0.75
1-1/8
1.125
1.088
1.299
1.24
13/16
0.827
0.798
9/16
0.57
0.55
0.24
0.18
0.188
0.941
0.023
7/8
0.875
1-5/16
1.312
1.269
1.516
1.447
29/32
0.922
0.89
1/32
0.67
0.64
0.24
0.18
0.188
1.097
0.025
1
1
1-1/2
1.5
1.45
1.732
1.653
1
1.018
0.982
23/32
0.73
0.7
0.3
0.24
1.88
1.254
0.027
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