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Nuts

Internal Threads - Class 2B

Nominal Size &
Threads / Inch &
Series Designation
Allow-
ance
Minor
Diameter
Pitch
Diameter
Major
Diameter
Min.
Max.
Min.
Max.
Tolerance
Min.
0-80
1-64
1-72
2-56
2-64
UNF
UNC
UNF
UNC
UNF
0.0005
0.0006
0.0006
0.0006
0.0006
0.0465
0.0561
0.0580
0.0667
0.0691
0.0514
0.0623
0.0635
0.0737
0.0753
0.0519
0.0629
0.0640
0.0744
0.0759
0.0542
0.0655
0.0665
0.0772
0.0786
0.0023
0.0026
0.0025
0.0028
0.0027
0.0600
0.0730
0.0730
0.0860
0.0860
3-48
3-56
4-40
4-48
5-40
UNC
UNF
UNC
UNF
UNC
0.0007
0.0007
0.0008
0.0007
0.0008
0.0764
0.0797
0.0849
0.0894
0.0979
0.0845
0.0865
0.0939
0.0968
0.1062
0.0855
0.0874
0.0958
0.0985
0.1088
0.0885
0.0902
0.0991
0.1016
0.1121
0.0030
0.0028
0.0033
0.0031
0.0033
0.0990
0.0990
0.1120
0.1120
0.1250
5-44
6-32
6-40
8-32
8-36
UNF
UNC
UNF
UNC
UNF
0.0007
0.0008
0.0008
0.0009
0.0008
0.1004
0.104
0.111
0.130
0.134
0.1079
0.114
0.119
0.139
0.142
0.1102
0.1177
0.1218
0.1437
0.1460
0.1134
0.1214
0.1252
0.1475
0.1496
0.0032
0.0037
0.0034
0.0038
0.0036
0.1250
0.1380
0.1380
0.1640
0.1640
10-24
10-32
12-24
12-28
1/4-20
UNC
UNF
UNC
UNF
UNC
0.0010
0.0009
0.0010
0.0010
0.0011
0.145
0.156
0.171
0.177
0.196
0.156
0.164
0.181
0.186
0.207
0.1629
0.1697
0.1889
0.1928
0.2175
0.1672
0.1736
0.1933
0.1970
0.2224
0.0043
0.0039
0.0044
0.0042
0.0049
0.1900
0.1900
0.2160
0.2160
0.2500
1/4-28
5/16-18
5/16-24
3/8-16
3/8-24
UNF
UNC
UNF
UNC
UNF
0.0010
0.0012
0.0011
0.0013
0.0011
0.211
0.252
0.267
0.307
0.330
0.220
0.265
0.277
0.321
0.034
0.2268
0.2764
0.2854
0.3344
0.3479
0.2311
0.2817
0.2902
0.3401
0.3528
0.0043
0.0053
0.0048
0.0057
0.0049
0.2500
0.3125
0.3125
0.3750
0.3750
7/16-14
7/16-20
1/2-13
1/2-20
9/16-12
UNC
UNF
UNC
UNF
UNC
0.0014
0.0013
0.0015
0.0013
0.0016
0.360
0.383
0.417
0.446
0.472
0.376
0.395
0.434
0.457
0.490
0.3911
0.4050
0.4500
0.4675
0.5084
0.3972
0.4104
0.4565
0.4731
0.5152
0.0061
0.0054
0.0065
0.0056
0.0068
0.4375
0.4375
0.5000
0.5000
0.5625
9/16-18
5/8-11
5/8-18
3/4-10
3/4-16
UNF
UNC
UNF
UNC
UNF
0.0014
0.0016
0.0014
0.0018
0.0015
0.502
0.527
0.565
0.642
0.682
0.515
0.546
0.578
0.663
0.696
0.5264
0.5660
0.5889
0.6850
0.7094
0.5323
0.5732
0.5949
0.6927
0.7159
0.0059
0.0072
0.0060
0.0077
0.0065
0.5625
0.6250
0.6250
0.7500
0.7500
7/8-9
7/8-14
1-8
1-12
1-14
UNC
UNF
UNC
UNF
UNS
0.0019
0.0016
0.0020
0.0018
0.0017
0.755
0.798
0.865
0.910
0.923
0.778
0.814
0.890
0.928
0.938
0.8028
0.8286
0.9188
0.9459
0.9536
0.8110
0.8356
0.9276
0.9535
0.9609
0.0082
0.0070
0.0088
0.0076
0.0073
0.8750
0.8750
1.0000
1.0000
1.0000
11/8-7
11/8-8
11/812
11/4-7
11/4-8
UNC
UN
UNF
UNC
UN
0.0022
0.0021
0.0018
0.022
0.0021
0.970
0.990
1.035
1.095
1.115
0.998
1.015
1.053
1.123
1.140
1.322
1.0438
1.0709
1.1572
1.1688
1.0416
0.0528
1.0787
1.668
1.1780
0.0094
0.0090
0.0078
0.0096
0.0092
1.1250
1.1250
1.1250
1.2500
1.2500
11/4-12
1 3/8-6
1 3/8-8
1 3/8-12
11/2-6
UNF
UNC
UN
UNF
UNC
0.0018
0.0024
0.0022
0.0019
0.0024
1.160
1.195
1.240
1.285
1.320
1.178
1.225
1.265
1.303
1.350
1.1959
1.2667
1.2938
1.3209
1.3917
1.2039
1.2771
1.3031
1.3291
1.4022
0.0080
0.0104
0.0093
0.0082
0.0105
1.2500
1.3750
1.3750
1.3750
1.5000
11/2-8
11/2-12
1 5/8-8
1 3/4-5
1 3/4-8
UN
UNC
UN
UNC
UN
0.0022
0.0019
0.0022
0.0027
0.0023
1.365
1.410
1.490
1.534
1.615
1.390
1.428
1.515
1.568
1.640
1.4188
1.4459
1.5438
1.6201
1.6688
1.4283
1.4542
1.5535
1.6317
1.6786
0.0095
0.0083
0.0097
0.0116
0.0098
1.5000
1.5000
1.6250
1.7500
1.7500
1 7/8-8
2-41/2
2-8
2 1/4-4.5
2 1/4-8
UN
UNC
UN
UNC
UN
0.0023
0.0029
0.0023
0.0029
0.0024
1.740
1.759
1.865
2.009
2.115
1.765
1.795
1.890
2.045
2.140
1.7938
1.8557
1.9188
2.1057
2.1688
1.8038
1.8681
1.9289
2.1183
2.1792
0.0100
0.0124
0.0101
0.0126
0.0104
1.8750
2.0000
2.0000
2.2500
2.2500
2 1/2-4
2 1/2-8
2 3/4-4
2 3/4-8
3-4
UNC
UN
UNC
UN
UNC
0.0031
0.0024
0.0032
0.0025
0.0032
2.229
2.365
2.479
2.615
2.729
2.267
2.390
2.517
2.640
2.767
2.3376
2.4188
2.5876
2.6688
2.8376
2.3511
2.4294
2.6013
2.6796
2.8515
0.0135
0.0106
0.0137
0.0108
0.0139
2.5000
2.5000
2.7500
2.7500
3.0000
3-8
3 1/4-4
31/4-8
3 1/2-4
31/2-8
UN
UNC
UN
UNC
UN
0.0026
0.0033
0.0026
0.0033
0.0026
2.865
2.979
3.115
3.229
3.365
2.890
3.017
3.140
3.267
3.390
2.9188
3.0876
3.1688
3.3376
3.4188
2.9299
3.1017
3.1801
3.3519
3.4303
0.0111
0.0141
0.0113
0.0143
0.0115
3.0000
3.2500
3.2500
3.5000
3.5000
3 3/4-4
3 3/4-8
4-4
4-8
UNC
UN
UNC
UN
0.0034
0.0027
0.0034
0.0027
3.479
3.615
3.729
3.865
3.517
3.640
3.767
3.890
3.5876
3.6688
3.8376
3.9188
3.6021
3.6805
3.8523
3.9307
0.0145
0.0117
0.0147
0.0119
3.7500
3.7500
4.0000
4.0000

Nominal Size
or
Basic Major Dia.
of Thread
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
Cylindrical
Basic
Max
Min
Max
Min
Basic
Max
Min
Nom
Max
Min
Max
Min
+ .010
Min
Max
5/8
0.6250
3/4
0.7500
7/8
0.8750
1
1.0000
15/16
1-1/8
1-5/16
1-1/2
0.938
1.125
1.312
1.500
0.922
1.088
1.269
1.450
1.083
1.299
1.516
1.732
1.051
1.240
1.447
1.653
23/32
13/16
29/32
1
0.731
0.827
0.922
1.018
0.706
0.798
0.890
0.982
1/2
9/16
21/32
23/32
0.51
0.57
0.67
0.73
0.49
0.55
0.64
0.70
0.24
0.24
0.24
0.30
0.18
0.18
0.18
0.24
0.156
0.188
0.188
0.188
0.797
0.941
1.097
1.254
0.021
0.023
0.025
0.027
 

 

 

 

 

 

Thread Size
G
H
F
A
T
Drill
Size
LBS Per M Pcs.
Flange Dia.
Barrel Height
Barrel
Diam.
Prong Height
Material Thickness
10 - 24
10 - 24
3/4
3/4
5/16
5/16
.243
.243
7/32
7/32
.040
.040
1/4
1/4
7
7
10-32
10-32
3/4
3/4
5/16
5/16
.243
.243
7/32
7/32
.040
.040
1/4
1/4
7
7
1/4 - 20
1/4 - 20
3/4
3/4
5/16
5/16
.305
.305
7/32
7/32
.047
.047
5/16
5/16
9
9
1/4 - 20
1/4 - 20
3/4
3/4
7/16
7/16
.305
.305
5/16
1/4
.047
.047
5/16
5/16
9
9
5/16 - 18
5/16 - 18
5/16 - 18
7/8
7/8
7/8
3/8
3/8
5/8
.390
.390
.390
1/4
1/4
5/16
.063
.063
.063
25/64
25/64
25/64
14
14
18
3/8 - 16
1
7/16
.440
11/32
.063
29/64
19
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nominal
Size or Basic
Major Diameter
0f Thread
Threads
per Inch
A
B
C
D
E
F
Wing
Spread
Wing
Height
Wing
Thickness
Between
Wings
Boss
Diameter
Boss
Height
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
6
0.1380
8
0.1640
10
0.1900
1/4
0.2500
5/16
0.3125
3/8
0.3750
1/2
0.5000
5/8
0.6250
3/4
0.7500
32
32
24 & 32
20
18
16
13
11
10
0.72
0.91
0.91
1.10
1.25
1.44
1.94
2.76
2.76
0.59
0.78
0.78
0.97
1.12
1.31
1.81
2.62
2.62
0.41
0.47
0.47
0.57
0.66
0.79
1.00
1.44
1.44
0.28
0.34
0.34
0.43
0.53
0.65
0.87
1.31
1.31
0.11
0.14
0.14
0.18
0.21
0.24
0.33
0.40
0.40
0.07
0.10
0.10
0.14
0.17
0.20
0.26
0.34
0.34
0.21
0.27
0.27
0.39
0.39
0.48
0.65
0.90
0.90
0.17
0.22
0.22
0.26
0.32
0.42
0.54
0.80
0.80
0.33
0.43
0.45
0.50
0.58
0.70
0.93
1.19
1.19
0.29
0.39
0.39
0.45
0.51
0.64
0.86
1.13
1.13
0.14
0.18
0.18
0.22
0.25
0.30
0.39
0.55
0.55
0.10
0.14
0.14
0.17
0.20
0.26
0.35
0.51
0.51
 
 
 
 
 
 
 
 
 
 
 
 
Finished Hex Nuts, Hex Jam and Two
Way Reversible Lock Nuts
 
Nominal
Or
Basic Major Dia of Thread
F
G
H
H1
Width Across Flats
Width Across Comers
Thickness Hex Nuts & Reversible Lock Nuts
Thickness Hex Jam Nuts
Basic
Max
Min
Max
Min
Basic
Max
Mmin
Basic
Max
Min
8
0.1640
10
0.1900
1/4
0.2500
5/16
0.3125
11/32
3/8
7/16
1/2
0.344
0.375
0.438
0.500
0.332
0.362
0.428
0.489
0.397
0.433
0.505
0.577
0.378
0.413
0.488
0.557
--
--
7/32
17/64
0.203
0.203
0.226
0.273
0.187
0.187
0.212
0.258
--
--
5/32
3/16
--
--
0.164
0.195
--
--
0.150
0.180
3/8
0.3750
7/16
0.4375
1/2
0.5000
9/16
0.5625
9/16
11/16
3/4
7/8
0.562
0.688
0.750
0.875
0.551
0.675
0.736
0.861
0.650
0.794
0.866
1.010
0.628
0.768
0.840
0.982
21/64
3/8
7/16
31/64
0.337
0.385
0.448
0.496
0.320
0.365
0.427
0.473
7/32
1/4
5/16
5/16
0.227
0.260
0.323
0.324
0.210
0.240
0.302
0.301
5/8
0.6250
3/4
0.7500
7/8
0.8750
1
1.0000
15/16
1-1/8
1-5/16
1-1/2
0.938
1.125
1.312
1.500
0.922
1.088
1.269
1.450
1.083
1.299
1.516
1.732
1.051
1.240
1.447
1.653
35/64
41/64
3/4
55/64
0.559
0.665
0.776
0.887
0.535
0.617
0.724
0.831
3/8
27/64
31/64
35/64
0.387
0.446
0.510
0.575
0.363
0.398
0.458
0.519
1-1/8
1.1250
1-1/4
1.2500
1-3/8
1.3750
1-1/2
1.5000
1-11/16
1-7/8
2-1/16
2-1/4
1.688
1.875
2.062
2.250
1.631
1.812
1.994
2.175
1.949
2.165
2.382
2.598
1.859
2.066
2.273
2.480
31/32
1-1/6
1-11/64
1-9/32
0.999
1.094
1.206
1.317
0.939
1.030
1.138
1.245
39/64
23/32
25/32
27/32
0.639
0.751
0.815
0.880
0.579
0.687
0.747
0.808
1-5/8
1.6250
1-3/4
1.7500
2
2.00000
2-1/4
2.2500
2-7/16
2-5/8
3
3-3/8
2.438
2.625
3.000
3.375
2.356
2.538
2.900
3.263
2.815
3.031
3.464
3.897
2.686
2.893
3.306
3.719
1-25/64
1-1/2
1-23/32
1-15/16
1.429
1.540
1.763
1.986
1.353
1.460
1.675
1.890
29/32
31/32
1-3/32
1-7/32
0.945
1.009
1.138
1.267
0.869
0.929
1.050
1.171
2-1/2
2.5000
2-3/4
2.7500
3
3.0000
3-3/4
4-1/8
4-1/2
3.750
4.125
4.500
3.625
3.988
4.350
4.330
4.763
5.196
4.133
4.546
4.959
2-5/32
2-3/8
2-19/32
2.209
2.431
2.654
2.105
2.319
2.534
1-11/32
1-15/32
1-19/32
1.396
1.525
1.654
1.292
1.413
1.534
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nominal Size or
Basic Major Dia. of Thread
F
G
H
Width Across
Flats
Width Across
Corners
Thickness
Heavy Hex Nuts
Basic
Max.
Min.
Max.
Min.
Basic
Max.
Min.
1/4
0.2500
5/16
0.3125
3/8
0.3750
7/16
0.4375
1/2
9/16
11/16
3/4
0.500
0.562
0.688
0.750
0.488
0.546
0.669
0.728
0.577
0.650
0.794
0.866
0.556
0.622
0.763
0.830
15/64
19/64
23/64
27/64
0.250
0.314
0.377
0.441
0.218
0.280
0.341
0.403
1/2
0.5000
9/16
0.5625
5/8
0.6250
3/4
0.7500
7/8
15/16
1-1/16
1-1/4
0.875
0.938
1.062
1.250
0.850
0.909
1.031
1.212
1.010
1.083
1.227
1.443
0.969
1.037
1.175
1.382
31/64
35/64
39/64
47/64
0.504
0.568
0.631
0.758
0.464
0.526
0.587
0.710
7/8
0.8750
1
1.0000
1-1/8
1.1250
1-1/4
1.2500
1-7/16
1-5/8
1-13/16
2
1.438
1.625
1.812
2.000
1.394
1.575
1.756
1.938
1.660
1.876
2.093
2.309
1.589
1.796
2.002
2.209
55/64
63/64
1-7/64
1-7/32
0.885
1.012
1.139
1.251
0.833
0.956
1.079
1.187
1-3/8
1.3750
1-1/2
1.5000
1-5/8
1.6250
1-3/4
1.7500
2-3/16
2-3/8
2-9/16
2-3/4
2.188
2.375
2.562
2.750
2.119
2.300
2.481
2.662
2.526
2.742
2.959
3.175
2.416
2.622
2.828
3.035
1-11/32
1-15/32
1-19/32
1-23/32
1.378
1.505
1.632
1.759
1.310
1.433
1.556
1.679
1-7/8
1.8750
2
2.0000
2-1/4
2.2500
2-1/2
2.5000
2-15/16
3-1/8
3-1/2
3-7/8
2.938
3.125
3.500
3.875
2.844
3.025
3.388
3.750
3.392
3.608
4.041
4.474
3.242
3.449
3.862
4.275
1-27/32
1-31/32
2-13/64
2-29/64
1.886
2.013
2.251
2.505
1.802
1.925
2.155
2.401
2-3/4
2.7500
3
3.0000
3-1/4
3.2500
3-1/2
3.5000
4-1/4
4-5/8
5
5-3/8
4.250
4.625
5.000
5.375
4.112
4.475
4.838
5.200
4.907
5.340
5.774
6.207
4.688
5.102
5.515
5.928
2-45/64
2-61/64
3-3/16
3-7/16
2.759
3.013
3.252
3.506
2.647
2.893
3.124
3.370
3-3/4
3.7500
4
4.000
5-3/4
6-1/8
5.750
6.125
5.562
5.925
6.640
7.073
6.341
6.755
3-11/16
3-15/16
3.760
4.014
3.616
3.862
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Normal Size or
Basic Major Dia of Thread
F
G
H
T
S
Runout Of
Bearing
Surface
FIM
Width Across Flats
Width Across Corners
Thickness
Unslotted
Thickness
Width of Slot
Basic
Max
Min
Max
Min
Basic
Max
Min
Max
Mmin
Max
Min
Max
3/8
<, /TD>
0.3750
7/16
0.4375
1/2
0.5000
 ,
9/16
11/16
3/4
0.562
0.688
0.750
0.551
0.675
0.736
0.650
0.794
0.866
0.628
0.768
0.840
21/64
3/8
7/16
0.337
0.385
0.448
0.320
0.365
0.427
0.21
0.23
0.29
0.19
0.21
0.27
0.15
0.15
0.18
0.12
0.12
0.15
0.018
0.018
0.019
5/8
0.6250
3/4
0.7500
7/8
0.8750
15/16
1-1/8
1-5/16
0.938
1.125
1.312
0.922
1.088
1.269
1.083
1.299
1.516
1.051
1.240
1.447
35/64
41/64
3/4
0.559
0.665
0.776
0.535
0.617
0.724
0.34
0.40
0.52
0.32
0.38
0.49
0.24
0.24
0.24
0.18
0.18
0.18
0.021
0.023
0.025
1
1.0000
1-1/8
1.1250
1-1/4
1.2500
1-1/2
1.5000
1-1/2
1-11/16
1-7/8
2-1/4
1.500
1.688
1.875
2.250
1.450
1.631
1.812
2.175
1.732
1.949
2.165
2.598
1.653
1.859
2.066
2.480
55/64
31/32
1-1/16
1-9/32
0.887
0.999
1.094
1.317
0.831
0.939
1.030
1.245
0.59
0.64
0.70
0.86
0.56
0.61
0.67
0.82
0.30
0.33
0.40
0.46
0.24
0.24
0.31
0.37
0.027
0.030
0.033
0.039
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nominal Size or
Basic Major Diameter of Thread
F
G
B
H
K
J
Width
Across Flats
Width
Across
Corners
Flange
Diameter
Nut
Thickness
Wrenching
Length
Flange
Thickness
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Min.
Max.
6
0.1380
8
0.1640
10
0.1900
0.312
0.344
0.375
0.302
0.334
0.365
0.361
0.397
0.433
0.342
0.381
0.416
0.422
0.469
0.500
0.406
0.452
0.480
0.171
0.203
0.219
0.156
0.187
0.203
0.10
0.13
0.13
0.02
0.02
0.03
12
0.216
1/4
0.2500
5/16
0.3125
0.438
0.438
0.500
0.428
0.428
0.489
0.505
0.505
0.577
0.488
0.488
0.557
0.594
0.594
0.680
0.574
0.574
0.660
0.236
0.236
0.283
0.222
0.222
0.268
0.14
0.14
0.17
0.04
0.04
0.04
3/8
0.3750
7/16
0.4375
1/2
0.5000
0.562
0.688
0.750
0.551
0.675
0.736
0.650
0.794
0.866
0.628
0.768
0.840
0.750
0.937
1.031
0.728
0.910
1.000
0.347
0.395
0.458
0.330
0.375
0.437
0.23
0.26
0.31
0.04
0.04
0.05
5/8
0.6250
3/4
0.7500
0.938
1.125
0.922
1.088
1.083
1.299
1.051
1.240
1.281
1.500
1.248
1.460
0.569
0.675
0.545
0.627
0.40
0.46
0.05
0.06
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nominal
Size or Basic Thread Diameter
F
G
H
I
Width Across Flats
Width Across
Corners
Thickness
Washer
Diameter
Hex
Basic
Max.
Min.
Max.
Min.
Max.
Min.
Ref.
4
0.1120
6
0.1380
8
0.1640
10
0.1900
1/4
0.2500
5/16
0.3125
3/8
0.3750
1/4
5/16
11/32
3/8
7/16
1/2
9/16
0.250
0.312
0.344
0.375
0.438
0.500
0.562
0.241
0.302
0.332
0.362
0.423
0.489
0.551
0.289
0.361
0.397
0.433
0.505
0.577
0.650
0.275
0.344
0.378
0.413
0.482
0.557
0.628
0.098
0.114
0.130
0.130
0.193
0.273
0.385
0.087
0.102
0.117
0.117
0.178
0.258
0.365
0.281
0.344
0.375
0.406
0.500
0.578
0.656
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Square and Hex Machine Screw Nuts
Nominal Size
or
Basic
Thread
Diameter
F
G
G1
H
Width Across Flats
Width Across Corners
Thickness
Square
Hex
Basic
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
2
0.0860
3
0.0990
3/16
3/16
0.188
0.188
0.180
0.180
0.265
0.265
0.247
0.247
0.217
0.217
0.205
0.205
0.066
0.066
0.057
0.057
4
0.1120
5
0.1250
6
0.1380
1/4
5/16
5/16
0.250
0.312
0.312
0.241
0.302
0.302
0.354
0.442
0.442
0.331
0.415
0.415
0.289
0.361
0.361
0.275
0.344
0.344
0.098
0.114
0.114
0.087
0.102
0.102
8
0.1640
10
0.1900
12
0.2160
11/32
3/8
7/16
0.344
0.375
0.438
0.332
0.362
0.423
0.486
0.530
0.619
0.456
0.497
0.581
0.397
0.433
0.505
0.378
0.413
0.482
0.130
0.130
0.161
0.117
0.117
0.148
1/4
0.2500
5/16
0.3125
3/8
0.3750
7/16
9/16
5/8
0.438
0.562
0.625
0.423
0.545
0.607
0.619
0.795
0.884
0.581
0.748
0.833
0.505
0.650
0.722
0.482
0.621
0.692
0.193
0.225
0.257
0.178
0.208
0.239
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Hex Panel Nuts
 
Size
Across the Flats
Thickness
1/8-27
1/8-27
3/8-32
3/8-32
15/32-32
9/16
9/16
1/2
9/16
9/16
1/8
3/16
3/32
3/32
3/32
 
 
 
 
 
 
 
Regular Square Nuts
 
Nominal or Basic Major Dia. of Thread
F
G
H
Width Across Flats
Width Across Corners
Across Corners Thickness
Basic
Max.
Mm.
Max.
Mm.
Basic
Max.
Mm.
1/4
0.2500
5/16
0.3125
3/8
0.3750
7/16
0.4375
7/16
9/16
5/8
3/4
0.438
0.562
0.625
0.750
0.425
0.547
0.606
0.728
0.619
0.795
0.884
1.061
0.584
0.751
0.832
1.000
7/32
17/64
21/64
3/8
0.235
0.283
0.346
0.394
0.203
0.249
0.310
0.356
1/2
0.5000
5/8
0.6250
3/4
0.7500
7/8
0.8750
13/16
1
1-1/8
1-5/16
0.812
1.000
1.125
1.312
0.788
0.969
1.088
1.269
1.149
1.414
1.591
1.856
1.082
1.330
1.494
1.742
7/16
35/64
21/32
49/64
0.458
0.569
0.680
0.792
0.418
0.525
0.632
0.740
1
1.0000
1-1/4
1.2500
1-1/2
1.5000
1-1/2
1-7/8
2-1/4
1.500
1.875
2.250
1.450
1.812
2.175
2.121
2.652
3.182
1.991
2.458
2.956
7/8
1-3/32
1-5/16
0.903
1.126
1.348
0.847
1.062
1.276
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nylon Insert
Stop Nuts
 
Nominal Size or Basic Thread Diameter
F
H
I
G
Width Across Flats
Thickness
Side
Height
Width
Across
Comers
Basic
Max.
Min.
Max.
Min.
Ref.
Ref.
4
0.1120
6
0.1380
8
0.1640
10
0.1900
1/4
0.2500
5/16
0.3125
3/8
0.3750
7/16
0.4375
1/2
0.5000
9/16
0.5625
5/8
0.6250
3/4
0.7500
7/8
0.8750
1
1.0000
1-1/8
1.1250
1-1/4
1.2500
1-1/2
1.5000
1/4
5/16
11/32
3/8
7/16
1/2
9/16
11/16
3/4
7/8
15/16
1-1/8
1-5/16
1-1/2
1-11/16
1-7/8
2-1/4
0.251
0.313
0.345
0.376
0.439
0.502
0.565
0.690
0.752
0.877
0.940
1.127
1.315
1.502
1.690
1.877
2.252
0.241
0.302
0.332
0.362
0.428
0.489
0.551
0.675
0.736
0.861
0.922
1.088
1.269
1.450
1.631
1.812
2.175
0.153
0.188
0.239
0.249
0.328
0.359
0.468
0.468
0.609
0.656
0.765
0.890
0.999
1.078
1.203
1.422
1.640
0.133
0.168
0.219
0.229
0.298
0.329
0.438
0.438
0.579
0.626
0.735
0.860
0.969
1.061
1.141
1.360
1.578
0.081
0.103
0.140
0.140
0.225
0.250
0.335
0.324
0.464
0.469
0.593
0.742
0.790
0.825
0.930
1.125
1.313
0.268
0.399
0.374
0.410
0.482
0.552
0.622
0.698
0.837
0.978
1.051
1.191
1.430
1.615
1.826
2.038
2.444
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nominal Size or Basic Thread
Diameter
F
H
I
G
Width Across Flats
Thickness
Side
Height
Width
Across
Corners
Basic
Max.
Min.
Max.
Min.
Ref.
Ref.
4
.1120
6
.1380
8
.1640
10
.1900
1/4
.2500
5/16
.3125
3/8
.3750
7/16
.4375
1/2
.5000
5/8
.6250
3/4
.7500
1/4
5/16
11/32
3/8
7/16
1/2
9/16
11/16
3/4
15/16
1-1/8
.251
.313
.345
.376
.439
.502
.565
.690
.752
.940
1.127
.241
.302
.332
.362
.428
.489
.551
.675
.736
.922
1.088
.124
.140
.187
.187
.218
.265
.281
.328
.328
.406
.421
.094
110
.157
.157
.188
.235
.251
.298
.298
.376
.391
.075
.090
.110
.110
125
.158
.150
.190
.225
.264
.288
.268
.399
.374
.410
.482
.552
.622
.694
.837
1.051
1.191
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nominal
Size or Basic Major Diameter of Thread
Threads per Inch
A
B
C
D
E
G
H
T
Wing Spread
Wing Height
Wing Thickness
Between Wings
Boss Diameter
Boss Height
Wall Height
Stock Thickness
Max.
Min.
Max.
Min.
Max.
Min.
Min.
Max.
Min.
Min.
Min.
Max.
Min.
6
0.1380
8
0.1640
10
0.1900
1/4
0.2500
5/16
0.3125
3/8
0.3750
32
32
24 & 32
20
18 & 24
16 & 24
0.78
0.78
0.91
1.11
1.30
1.41
0.72
0.72
0.85
1.05
1.24
1.34
0.40
0.40
0.47
0.50
0.59
0.67
0.34
0.34
0.41
0.44
0.53
0.61
0.18
0.18
0.21
0.25
0.30
0.34
0.14
0.14
0.17
0.21
0.26
0.30
0.25
0.25
0.34
0.34
0.46
0.69
0.41
0.41
0.53
0.62
0.73
0.83
0.35
0.35
0.47
0.56
0.67
0.77
0.08
0.08
0.10
0.11
0.14
0.16
0.12
0.12
0.12
0.12
0.18
0.18
0.04
0.04
0.04
0.05
0.06
0.06
0.03
0.03
0.03
0.04
0.05
0.05
 
 
 
 
 
 
 
 
 
 
 
 
 
Nom.
Size
In
Inches
T
W
B
Width Across Flats
Overall
Thickness
Hex
Height
Nom.
Max.
Min.
Max.
Min.
(Min.)
1/4
5/16
3/8
7/16
1/2
9/16
0.4385
0.5020
0.5645
0.428
0.489
0.551
0.226
0.273
0.337
0.212
0.258
0.320
0.145
0.166
0.198
7/16
1/2
9/16
11/16
3/4
7/8
0.6895
0.7520
0.8770
0.675
0.736
0.861
0.385
0.448
0.496
0.365
0.427
0.473
0.223
0.262
0.286
5/8
3/4
15/16
1-1/8
0.9395
1.1270
0.922
1.088
0.559
0.665
0.535
0.617
0.329
0.382
7/8
1
1-5/16
1-1/2
1.3145
1.5020
1.2690
1.4500
0.776
0.887
0.724
0.831
0.450
0.513
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nom.
Size
In
Inches
F
B
H
A
K
Width Across Flats
Flange
Diam.
Overall
Thickness
Hex
Height
Flange
Thick.
Nom.
Max.
Min.
(Max.)
Max.
Min.
(Min.)
(Min.)
3/8
1/2
5/8
3/4
9/16
3/4
15/16
1-1/8
0.5645
0.7520
0.9395
1.1270
0.551
0.736
0.922
1.088
0.810
1.070
1.330
1.585
0.425
0.555
0.690
0.825
0.404
0.528
0.646
0.742
0.200
0.260
0.320
0.380
0.060
0.080
0.100
0.110
 
 
 
 
 
 
 
 
 
 
® Stover is a registered trademark of RB&W Corporation.
 
Nom.
Size In
Inches
T
W
H
Width Across Flats
Overall
Thickness
Hex
Height
Max.
Min.
Max.
Min.
Max.
Min.
1-1/8
1-1/4
1-3/8
1-1/2
1-3/4
2
1.688
1.875
2.062
2.250
2.625
3.000
1.631
1.812
1.994
2.175
2.538
2.900
0.999
1.094
1.206
1.317
1.540
1.763
0.939
1.030
1.138
1.245
1.460
1.675
0.657
0.719
0.793
0.865
1.012
1.158

0.636
0.698
0.771
0.843
0.989
1.134

 

 

 

 

 

®Stover is a registered trademark of RB&W Corporation.
青岛奥塔克贸易有限公司版权所有　　　 [management] Statistic：