R. J. Leahy Company TechCenter
Hex Nuts
Heavy Slotted Flange Kep Machine Panel Square


Hex Finished (standard) and Jam
Hex Finished Nut Hex Finished Nut Profile Hex Jam Nut Profile
Nominal
Or
Basic Major Dia of Thread		 F G H H1
Width Across Flats Width Across Comers Thickness Hex Finished 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

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Heavy Hex Nut Heavy Hex Heavy hex Nut Profile
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

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Slotted Hex Nut (TOP) Slotted Hex Slotted Hex Nut Profile
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 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

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Flange Lock Nuts Flange Nut
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

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"K" Lock (Kep)
"K" Lock Nut (TOP) "K" Lock Nut (PROFILE) "K" Lock Nut (WASHER FACE)
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

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Square and Hex Machine
Square and Hex Machine Screw Nut
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

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Hex Panel Hex Panel Nut
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

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Square Square Nut Square Nut Profile
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

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This page last revised 05/04/99