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AFBMA Locknut Screw Threads

INDEX of THREAD DATA CHARTS

Internal Lock Nut Threads per ANSI/AFBMA 8.2

Locknut-thread-nut

Locknut Dimensions (inches)
Companion
Lock Washer
Size
Designation
Locknut Threads
Face Diameter
Outside
Diameter
Thickness
Chamfer
of
Thread
Slot
Whittet
Higgins
Designation
Threads per Inch
Minor Diameter
Pitch Diameter
Major
Diameter
Diameter
Width
+0.005
-0.015
+0.010  -0.020
Min
Max
Min
Max
Min
Min
Max
Min
Max
Min
Max
D1
D2
D3
E
C
H
J
F
G
N-00
32
0.3572
0.3606
0.3707
0.3733
0.3910
0.6050
0.6250
3/4
0.2090
0.2290
1/32
5/8
0.120
0.130
00
N-01
32
0.4352
0.4386
0.4487
0.4513
0.4690
0.6990
0.7190
7/8
0.3030
0.3230
1/32
3/4
0.120
0.130
01
N-02
32
0.5522
0.5556
0.5657
0.5687
0.5860
0.7930
0.8130
1
0.3030
0.3230
1/32
13/16
0.120
0.130
02
N-03
32
0.6302
0.6336
0.6437
0.6467
0.6640
0.9180
0.9380
1-1/8
0.3340
0.3540
1/32
15/16
0.120
0.130
03
N-04
32
0.7472
0.7506
0.7607
0.7641
0.7810
1.1050
1.1250
1-3/8
0.3650
0.3850
1/32
1-3/16
0.178
0.198
04
N-05
32
0.9352
0.9386
0.9487
0.9521
0.9690
1.2610
1.2810
1-9/16
0.3960
0.4160
1/32
1-3/8
0.178
0.198
05
N-06
18
1.1129
1.1189
1.1369
1.1409
1.1730
1.4800
1.5000
1-3/4
0.3960
0.4160
3/64
1-9/16
0.178
0.198
06
N-065
18
1.2524
1.2584
1.2764
1.2804
1.3120
1.7930
1.8130
2-1/16
0.4280
0.4480
3/64
1-7/8
0.178
0.198
065
N-07
18
1.3159
1.3219
1.3399
1.3439
1.3760
1.7930
1.8130
2-1/17
0.4280
0.4480
3/64
1-7/8
0.178
0.198
07
N-08
18
1.5029
1.5089
1.5269
1.5314
1.5630
1.9800
2.0000
2-1/4
0.4280
0.4480
3/64
2-1/16
0.240
0.260
08
N-09
18
1.7069
1.7129
1.7309
1.7354
1.7670
2.2610
2.2810
2-17/32
0.4280
0.4480
3/64
2-11/32
0.240
0.260
09
N-10
18
1.9069
1.9129
1.9309
1.9354
1.9670
2.4180
2.4380
2-11/16
0.4900
0.5100
3/64
2-1/2
0.240
0.260
10
N-11
18
2.0969
2.1029
2.1209
2.1260
2.1570
2.6360
2.6560
2-31/32
0.4900
0.5100
3/64
2-23/32
0.240
0.260
11
N-12
18
2.2999
2.3059
2.3239
2.3290
2.3600
2.8240
2.8440
3-5/32
0.5210
0.5410
3/64
2-29/32
0.240
0.260
12
N-13
18
2.4879
2.4939
2.5119
2.5170
2.5480
3.0430
3.0630
3-3/8
0.5530
0.5730
3/64
3-1/8
0.240
0.260
13
N-14
18
2.6909
2.6969
2.7149
2.7200
2.7510
3.2830
3.3130
3-5/8
0.5530
0.5730
3/64
3-3/8
0.240
0.260
14
AN-15
12
2.8428
2.8518
2.8789
2.8843
2.9330
3.5330
3.5630
3-7/8
0.5840
0.6040
5/64
3-5/8
0.360
0.385
15
AN-16
12
3.0468
3.0558
3.0829
3.0888
3.1370
3.1840
3.8440
4-5/32
0.5840
0.6040
5/64
3-29/32
0.360
0.385
16
AN-17
12
3.2498
3.2588
3.2859
3.2918
3.3400
4.0010
4.0310
4-13/32
0.6150
0.6350
5/64
4-3/32
0.360
0.385
17
AN-18
12
3.4368
3.4458
3.4729
3.4803
3.5270
4.2510
4.2810
4-21/32
0.6780
0.6980
5/64
4-11/32
0.360
0.385
18
AN-19
12
3.6398
3.6488
3.6759
3.6833
3.7300
4.5330
4.5630
4-15/16
0.7090
0.7290
5/64
4-5/8
0.360
0.385
19
AN-20
12
3.8278
3.8368
3.8639
3.8713
3.9180
4.7830
4.8130
5-3/16
0.7350
0.7600
5/64
4-7/8
0.360
0.385
20
AN-21
12
4.0318
4.0408
4.0679
4.0762
4.1220
4.9700
5.0000
5-7/16
0.7350
0.7600
5/64
5-1/16
0.485
0.510
21
AN-22
12
4.2348
4.2438
4.2709
4.2792
4.3250
5.2510
5.2810
5-23/32
0.7660
0.7910
5/64
5-11/32
0.485
0.510
22
AN-24 
12
4.6258
4.6348
4.6619
4.6702
4.7160
5.6580
5.6880
6-1/8
0.7980
0.8230
5/64
5-3/4
0.485
0.510
24
AN-26
12
5.0158
5.0248
5.0519
5.0602
5.1050
6.1580
6.1880
6-3/4
0.8600
0.8850
5/64
6-1/4
0.610
0.635
26
AN-28
12
5.4068
5.4158
5.4429
5.4512
5.4970
6.5010
6.5310
7-3/32
0.9230
0.9480
5/64
6-19/32
0.610
0.635
28
AN-30
12
5.7978
5.8068
0.5834
5.8422
5.8880
7.0330
7.0630
7-11/16
0.9540
0.9790
5/64
7-1/8
0.610
0.635
30
AN-32
8
6.1487
6.1522
6.2028
6.2119
6.2840
7.3980
7.4380
8-1/16
1.0160
1.0410
3/32
7-1/2
0.610
0.635
32
AN-34
8
6.5237
6.5372
6.5778
6.5869
6.6590
7.9910
8.0310
8-21/32
1.0480
1.0730
3/32
8-3/32
0.610
0.635
34
AN-36
8
6.9307
6.9442
6.9848
6.9939
7.0660
8.3350
8.3750
9-1/16
1.0790
1.1040
3/32
8-7/16
0.735
0.760
36
AN-38
8
7.3367
7.3502
7.3908
7.3999
7.4720
8.7410
8.7810
9-15/32
1.1100
1.1350
3/32
8-27/32
0.735
0.760
38
AN-40
8
7.7117
7.7252
7.7658
7.7772
7.8470
9.1160
9.1560
9-27/32
1.1730
1.1980
3/32
9-7/32
0.735
0.760
40
N-44*
8
8.4927
8.5062
8.5468
8.5589
8.6280
9.8030
9.8430
11
1.2300
1.2600
3/32
10
0.980
1.010
44
*Angle of Chamfered face for N-44 is 30°
All dimensions in inches. For dimensions in millimeters, multiply inch values, except thread diameters, by 25.4 and round result to two decimal places. Threads are American National form, Class 3. Typical steels for locknuts are: AISI, C1015, C1018, C1020
**Gage Crib Worldwide, Inc. has provided this content for general information purposes only and does not constitute advice. Gage Crib Worldwide, Inc. tries to provide content that is true and accurate as of the date of writing; however, we give no assurance.
 

 

External Lock Nut Threads per ANSI/AFBMA 8.2

Locknut Shaft Dimensions (inches)
Locknut Threads
Relief
Keyway
Whittet Higgins Designation
Bearing Bore
V2
Threads per Inch
Major Diameter
Pitch Diameter
Minor Diameter
Length    L
Diameter   D
Width      W
Depth   H
Width    S
M
Max
Max
Max
Min
Max
Max
Max
Max
Min
Min
Min
N-00
0.3937
0.312
32
0.391
0.3707
0.3681
0.3527
0.297
0.3421
0.078
0.078
0.125
0.094
N-01
0.4724
0.406
32
0.469
0.4487
0.4461
0.4307
0.391
0.4201
0.078
0.078
0.125
0.094
N-02
0.5906
0.500
32
0.586
0.5657
0.5627
0.5477
0.391
0.5371
0.078
0.078
0.125
0.094
N-03
0.6693
0.562
32
0.664
0.6437
0.6407
0.6257
0.422
0.6151
0.078
0.078
0.125
0.094
N-04
0.7874
0.719
32
0.781
0.7607
0.7573
0.7427
0.453
0.7321
0.078
0.078
0.188
0.094
N-05
0.9843
0.875
32
0.969
0.9487
0.9453
0.9307
0.484
0.9201
0.078
0.094
0.188
0.125
N-06
1.1811
1.062
18
1.173
1.1369
1.1329
1.1048
0.484
1.0649
0.109
0.094
0.188
0.125
N-07
1.3780
1.250
18
1.376
1.3399
1.3359
1.3078
0.516
1.2972
0.109
0.094
0.188
0.125
N-08
1.5748
1.469
18
1.563
1.5269
1.5224
1.4948
0.547
1.4842
0.109
0.094
0.312
0.125
N-09
1.7717
1.688
18
1.767
1.7309
1.7264
1.6988
0.547
1.6882
0.141
0.094
0.312
0.156
N-10
1.9685
1.875
18
1.967
1.9309
1.9264
1.8988
0.609
1.8882
0.141
0.094
0.312
0.156
N-11
2.1654
2.062
18
2.157
2.1209
2.1158
2.0888
0.609
2.0782
0.141
0.125
0.312
0.156
N-12
2.3622
2.250
18
2.360
2.3239
2.3188
2.2918
0.641
2.2812
0.141
0.125
0.312
0.156
N-13
2.5591
2.438
18
2.548
2.5119
2.5068
2.4798
0.672
2.4692
0.141
0.125
0.312
0.156
N-14
2.7559
2.625
18
2.751
2.7149
2.7098
2.6828
0.672
2.6722
0.141
0.125
0.312
0.250
AN-15
2.9528
2.781
12
2.933
2.8789
2.8735
2.8308
0.703
2.8095
0.172
0.125
0.312
0.250
AN-16
3.1496
3.000
12
3.137
3.0829
3.0770
3.0348
0.703
3.0135
0.172
0.125
0.375
0.250
Threads are American National form Class 3. All dimensions in inches. For dimensions in millimeters, multiply inch values, except thread diameters, by 25.4 and round result to two decimal places.  
**Gage Crib Worldwide, Inc. has provided this content for general information purposes only and does not constitute advice. Gage Crib Worldwide, Inc. tries to provide content that is true and accurate as of the date of writing; however, we give no assurance.
 

Disclaimer
This data is provided for general information only. The intention is to provide accurate information; regardless; errors may exist in the supplied information. If accuracy is critical, base your final decisions on the data provided in the root document; which is a copyrighted document. To purchase a copy visit an Authorized Reseller.

Comments
Original Posting: 3/2/2011
Last Revision: 2/19/2015
Error corrections in, or comments about, the above data can be sent to: gageguy@gagecrib.com

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