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External ACME Thread General Purpose Size Chart
Published:2018-09-01 08:32:17    Text Size:【BIG】【MEDIUM】【SMALL
Summary:The following table defines recommended industry standard sizes for External ACME General Purpose Threads per American National Standard ASME/ANSI B1.5.

The following table defines recommended industry standard sizes for External ACME General Purpose Threads per American National Standard ASME/ANSI B1.5.

There are three classes of General Purpose ACME threads, 2G, 3G, and 4G each class provides some clearance on all standard size diameters for free movement, and are used in assemblies with the internal thread rigidly fixed and movement of the external thread in a direction perpendicular to its axis limited by its bearing or bearings.

Designs should only utilize external and internal ACME threads of the same class and type, with Class 2G being the preferred choice. If less backlash or end play is desired, Classes 3G and 4G are provided. Class 5G is not recommended for new designs.

Designation
SizeDecimal
TPI
Tol.Class
Major Dia.
Pitch Dia.
Minor Dia.
Max.
Min.
Max.
Min.
Max
Min.
1/4-16 Acme
0.25
16
2G
0.2500
0.2450
0.2148
0.2043
0.1775
0.1618
1/4-16 Acme
0.25
16
3G
0.2500
0.2450
0.2158
0.2109
0.1775
0.1702
1/4-16 Acme
0.25
16
4G
0.2500
0.2450
0.2168
0.2133
0.1775
0.1722
1/4-16 Acme
0.25
16
5G
0.2500
0.2450
0.2188
0.2160
0.1775
0.1733
5/16-14 Acme
0.3125
14
2G
0.3125
0.3075
0.2728
0.2614
0.2311
0.2140
5/16-14 Acme
0.3125
14
3G
0.3125
0.3075
0.2738
0.2685
0.2311
0.2231
5/16-14 Acme
0.3125
14
4G
0.3125
0.3075
0.2748
0.271
0.2311
0.2254
5/16-14 Acme
0.3125
14
5G
0.3125
0.3075
0.2768
0.2738
0.2311
0.2266
3/8-12 Acme
0.375
12
2G
0.3750
0.3700
0.3284
0.3161
0.2817
0.2632
3/8-12 Acme
0.375
12
3G
0.3750
0.3700
0.3296
0.3238
0.2817
0.2730
3/8-12 Acme
0.375
12
4G
0.3750
0.3700
0.3309
0.3268
0.2817
0.2755
3/8-12 Acme
0.375
12
5G
0.3750
0.3700
0.3333
0.33
0.2817
0.2767
7/16-12 Acme
0.4375
12
2G
0.4375
0.4325
0.3909
0.3783
0.3442
0.3253
7/16-12 Acme
0.4375
12
3G
0.4375
0.4325
0.3921
0.3862
0.3442
0.3354
7/16-12 Acme
0.4375
12
4G
0.4375
0.4325
0.3934
0.3892
0.3442
0.3379
7/16-12 Acme
0.4375
12
5G
0.4375
0.4325
0.3958
0.3924
0.3442
0.3391
1/2-10 Acme
0.5
10
2G
0.5000
0.4950
0.4443
0.4306
0.3800
0.3594
1/2-10 Acme
0.5
10
3G
0.5000
0.4950
0.4458
0.4394
0.3800
0.3704
1/2-10 Acme
0.5
10
4G
0.5000
0.4950
0.4472
0.4426
0.3800
0.3731
1/2-10 Acme
0.5
10
5G
0.5000
0.4950
0.45
0.4463
0.3800
0.3745
5/8-8 Acme
0.625
8
2G
0.6250
0.6188
0.5562
0.5408
0.4800
0.4569
5/8-8 Acme
0.625
8
3G
0.6250
0.6188
0.5578
0.5506
0.4800
0.4692
5/8-8 Acme
0.625
8
4G
0.6250
0.6188
0.5593
0.5542
0.4800
0.4723
5/8-8 Acme
0.625
8
5G
0.6250
0.6188
0.5625
0.5584
0.4800
0.4738
3/4-6 Acme
0.75
6
2G
0.7500
0.7417
0.6598
0.6424
0.5633
0.5372
3/4-6 Acme
0.75
6
3G
0.7500
0.7417
0.6615
0.6534
0.5633
0.5511
3/4-6 Acme
0.75
6
4G
0.7500
0.7417
0.6632
0.6574
0.5633
0.5546
3/4-6 Acme
0.75
6
5G
0.7500
0.7417
0.6667
0.662
0.5633
0.5563
7/8-6 Acme
0.875
6
2G
0.8750
0.8667
0.7842
0.7663
0.6883
0.6615
7/8-6 Acme
0.875
6
3G
0.8750
0.8667
0.7861
0.7778
0.6883
0.6758
7/8-6 Acme
0.875
6
4G
0.8750
0.8667
0.788
0.782
0.6883
0.6794
7/8-6 Acme
0.875
6
5G
0.8750
0.8667
0.7917
0.7869
0.6883
0.6811
1-5 Acme
1
5
2G
1.0000
0.9900
0.892
0.8726
0.7800
0.7509
1-5 Acme
1
5
3G
1.0000
0.9900
0.894
0.8849
0.7800
0.7664
1-5 Acme
1
5
4G
1.0000
0.9900
0.896
0.8895
0.7800
0.7703
1-5 Acme
1
5
5G
1.0000
0.9900
0.9
0.8948
0.7800
0.7722
1 1/8-5 Acme
1.125
5
2G
1.1250
1.1150
1.0165
0.9967
0.9050
0.8753
1 1/8-5 Acme
1.125
5
3G
1.1250
1.1150
1.0186
1.0094
0.9050
0.8912
1 1/8-5 Acme
1.125
5
4G
1.1250
1.1150
1.0208
1.0142
0.9050
0.8951
1 1/8-5 Acme
1.125
5
5G
1.1250
1.1150
1.025
1.0197
0.9050
0.8971
1 1/4-5 Acme
1.25
5
2G
1.2500
1.2400
1.1411
1.121
1.0300
0.9998
1 1/4-5 Acme
1.25
5
3G
1.2500
1.2400
1.1433
1.1339
1.0300
1.0159
1 1/4-5 Acme
1.25
5
4G
1.2500
1.2400
1.1455
1.1388
1.0300
1.0199
1 1/4-5 Acme
1.25
4
5G
1.2500
1.2400
1.15
1.1446
1.0300
1.0219
1 3/8-4 Acme
1.375
4
2G
1.3750
1.3625
1.2406
1.2188
1.1050
1.0720
1 3/8-4 Acme
1.375
4
3G
1.3750
1.3625
1.243
1.2327
1.1050
1.0896
1 3/8-4 Acme
1.375
4
4G
1.3750
1.3625
1.2453
1.238
1.1050
1.0940
1 3/8-4 Acme
1.375
4
5G
1.3750
1.3625
1.25
1.2441
1.1050
1.0962
1 1/2-4 Acme
1.5
4
2G
1.5000
1.4875
1.3652
1.3429
1.2300
1.1965
1 1/2-4 Acme
1.5
4
3G
1.5000
1.4875
1.3677
1.3573
1.2300
1.2144
1 1/2-4 Acme
1.5
4
4G
1.5000
1.4875
1.3701
1.3627
1.2300
1.2189
1 1/2-4 Acme
1.5
4
5G
1.5000
1.4875
1.375
1.369
1.2300
1.2210
1 3/4-4 Acme
1.75
4
2G
1.7500
1.7375
1.6145
1.5916
1.4800
1.4456
1 3/4-4 Acme
1.75
4
3G
1.7500
1.7375
1.6171
1.6064
1.4800
1.4640
1 3/4-4 Acme
1.75
4
4G
1.7500
1.7375
1.6198
1.6122
1.4800
1.4686
1 3/4-4 Acme
1.75
4
5G
1.7500
1.7375
1.625
1.6189
1.4800
1.4708
2-4 Acme
2
4
2G
2.0000
1.9875
1.8637
1.8402
1.7300
1.6948
2-4 Acme
2
4
3G
2.0000
1.9875
1.8665
1.8555
1.7300
1.7135
2-4 Acme
2
4
4G
2.0000
1.9875
1.8693
1.8615
1.7300
1.7183
2-4 Acme
2
4
5G
2.0000
1.9875
1.875
1.8687
1.7300
1.7206
2 1/4-3 Acme
2.25
3
2G
2.2500
2.2333
2.0713
2.045
1.8967
1.8572
2 1/4-3 Acme
2.25
3
3G
2.2500
2.2333
2.0743
2.062
1.8967
1.8783
2 1/4-3 Acme
2.25
3
4G
2.2500
2.2333
2.0773
2.0685
1.8967
1.8835
2 1/4-3 Acme
2.25
3
5G
2.2500
2.2333
2.0833
2.0763
1.8967
1.8862
2 1/2-3 Acme
2.5
3
2G
2.5000
2.4833
2.3207
2.2939
2.1467
2.1065
2 1/2-3 Acme
2.5
3
3G
2.5000
2.4833
2.3238
2.3113
2.1467
2.1279
2 1/2-3 Acme
2.5
3
4G
2.5000
2.4833
2.327
2.3181
2.1467
2.1333
2 1/2-3 Acme
2.5
3
5G
2.5000
2.4833
2.333
2.3262
2.1467
2.1360
2 3/4-3 Acme
2.75
3
2G
2.7500
2.7333
2.57
2.5427
2.3967
2.3558
2 3/4-3 Acme
2.75
3
3G
2.7500
2.7333
2.5734
2.567
2.3967
2.3776
2 3/4-3 Acme
2.75
3
4G
2.7500
2.7333
2.5767
2.5676
2.3967
2.3831
2 3/4-3 Acme
2.75
3
5G
2.7500
2.7333
2.5833
2.576
2.3967
2.3858
3-2 Acme
3
2
2G
3.0000
2.9750
2.736
2.7044
2.4800
2.4326
3-2 Acme
3
2
3G
3.0000
2.9750
2.7395
2.7248
2.4800
2.4579
3-2 Acme
3
2
4G
3.0000
2.9750
2.743
2.7325
2.4800
2.4642
3-2 Acme
3
2
5G
3.0000
2.9750
2.75
2.7416
2.4800
2.4674
3 1/2-2 Acme
3.5
2
2G
3.5000
3.4750
3.235
3.2026
2.9800
2.9314
3 1/2-2 Acme
3.5
2
3G
3.5000
3.4750
3.2388
3.2237
2.9800
2.9574
3 1/2-2 Acme
3.5
2
4G
3.5000
3.4750
3.2425
3.2317
2.9800
2.9638
3 1/2-2 Acme
3.5
2
5G
3.5000
3.4750
3.25
3.2413
2.9800
2.9669
4-2 Acme
4
2
2G
4.0000
3.9750
3.734
3.7008
3.4800
3.4302
4-2 Acme
4
2
3G
4.0000
3.9750
3.738
3.7225
3.4800
3.4568
4-2 Acme
4
2
4G
4.0000
3.9750
3.742
3.7309
3.4800
3.4634
4-2 Acme
4
2
5G
4.0000
3.9750
3.75
3.7411
3.4800
3.4666
4 1/2-2 Acme
4.5
2
2G
4.5000
4.4750
4.233
4.1991
3.9800
3.9291
4 1/2-2 Acme
4.5
2
3G
4.5000
4.4750
4.2373
4.2215
3.9800
3.9563
4 1/2-2 Acme
4.5
2
4G
4.5000
4.4750
4.2415
4.2302
3.9800
3.9631
4 1/2-2 Acme
4.5
2
5G
4.5000
4.4750
4.25
4.2409
3.9800
3.9663
5-2 Acme
5
2
2G
5.0000
4.9750
4.7319
4.6973
4.4800
4.4281
5-2 Acme
5
2
3G
5.0000
4.9750
4.7364
4.7202
4.4800
4.4557
5-2 Acme
5
2
4G
5.0000
4.9750
4.7409
4.7294
4.4800
4.4627
5-2 Acme
5
2
5G
5.0000
4.9750
4.75
4.7408
4.4800
4.4662
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