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Internal ACME Thread General Purpose Size Chart

ANSI Hardware Engineering Data
External ACME Thread General Purpose Size Table Chart

The following table defines recommended industry standard sizes for Internal ACME General Purpose Threads per American National Standard ASME/ANSI B1.5. All dimensional data is given in inches.

ACME Internal Thread

Designation
Size
Decimal
TPI
Tol.
Class
Minor Dia.
Major Dia.
Min.
Max.
Min.
Max.
1/4-16 ACME
0.25
16
2G
0.1875
0.1925
0.2600
0.2700
1/4-16 ACME
0.25
16
3G
0.1875
0.1925
0.2600
0.2700
1/4-16 ACME
0.25
16
4G
0.1875
0.1925
0.2600
0.2700
1/4-16 ACME
0.25
16
5G
0.1875
0.1925
0.2600
0.2700
5/16-14 ACME
0.3125
14
2G
0.2411
0.2461
0.3225
0.3325
5/16-14 ACME
0.3125
14
3G
0.2411
0.2461
0.3225
0.3325
5/16-14 ACME
0.3125
14
4G
0.2411
0.2461
0.3225
0.3325
5/16-14 ACME
0.3125
14
5G
0.2411
0.2461
0.3225
0.3325
3/8-12 ACME
0.375
12
2G
0.2917
0.2967
0.3850
0.3950
3/8-12 ACME
0.375
12
3G
0.2917
0.2967
0.3850
0.3950
3/8-12 ACME
0.375
12
4G
0.2917
0.2967
0.3850
0.3950
3/8-12 ACME
0.375
12
5G
0.2917
0.2967
0.3850
0.3950
7/16-12 ACME
0.4375
12
2G
0.3542
0.3592
0.4475
0.4575
7/16-12 ACME
0.4375
12
3G
0.3542
0.3592
0.4475
0.4575
7/16-12 ACME
0.4375
12
4G
0.3542
0.3592
0.4475
0.4575
7/16-12 ACME
0.4375
12
5G
0.3542
0.3592
0.4475
0.4575
1/2-10 ACME
0.5
10
2G
0.4000
0.4050
0.52
0.5400
1/2-10 ACME
0.5
10
3G
0.4000
0.4050
0.52
0.5400
1/2-10 ACME
0.5
10
4G
0.4000
0.4050
0.52
0.5400
1/2-10 ACME
0.5
10
5G
0.4000
0.4050
0.52
0.5400
5/8-8 ACME
0.625
8
2G
0.5000
0.5062
0.645
0.6650
5/8-8 ACME
0.625
8
3G
0.5000
0.5062
0.645
0.6650
5/8-8 ACME
0.625
8
4G
0.5000
0.5062
0.645
0.6650
5/8-8 ACME
0.625
8
5G
0.5000
0.5062
0.645
0.6650
3/4-6 ACME
0.75
6
2G
0.5833
0.5916
0.77
0.7900
3/4-6 ACME
0.75
6
3G
0.5833
0.5916
0.77
0.7900
3/4-6 ACME
0.75
6
4G
0.5833
0.5916
0.77
0.7900
3/4-6 ACME
0.75
6
5G
0.5833
0.5916
0.77
0.7900
7/8-6 ACME
0.875
6
2G
0.7083
0.7166
0.895
0.9150
7/8-6 ACME
0.875
6
3G
0.7083
0.7166
0.895
0.9150
7/8-6 ACME
0.875
6
4G
0.7083
0.7166
0.895
0.9150
7/8-6 ACME
0.875
6
5G
0.7083
0.7166
0.895
0.9150
1-5 ACME
1
5
2G
0.8000
0.8100
1.02
1.0400
1-5 ACME
1
5
3G
0.8000
0.8100
1.02
1.0400
1-5 ACME
1
5
4G
0.8000
0.8100
1.02
1.0400
1-5 ACME
1
5
5G
0.8000
0.8100
1.02
1.0400
1 1/8-5 ACME
1.125
5
2G
0.9250
0.9350
1.145
1.165
1 1/8-5 ACME
1.125
5
3G
0.9250
0.9350
1.145
1.165
1 1/8-5 ACME
1.125
5
4G
0.9250
0.9350
1.145
1.165
1 1/8-5 ACME
1.125
5
5G
0.9250
0.9350
1.145
1.165
1 1/4-5 ACME
1.25
5
2G
1.0500
1.0600
1.27
1.29
1 1/4-5 ACME
1.25
5
3G
1.0500
1.0600
1.27
1.29
1 1/4-5 ACME
1.25
5
4G
1.0500
1.0600
1.27
1.29
1 1/4-5 ACME
1.25
4
5G
1.0500
1.0600
1.27
1.29
1 3/8-4 ACME
1.375
4
2G
1.1250
1.1375
1.395
1.415
1 3/8-4 ACME
1.375
4
3G
1.1250
1.1375
1.395
1.415
1 3/8-4 ACME
1.375
4
4G
1.1250
1.1375
1.395
1.415
1 3/8-4 ACME
1.375
4
5G
1.1250
1.1375
1.395
1.415
1 1/2-4 ACME
1.5
4
2G
1.2500
1.2625
1.52
1.54
1 1/2-4 ACME
1.5
4
3G
1.2500
1.2625
1.52
1.54
1 1/2-4 ACME
1.5
4
4G
1.2500
1.2625
1.52
1.54
1 1/2-4 ACME
1.5
4
5G
1.2500
1.2625
1.52
1.54
1 3/4-4 ACME
1.75
4
2G
1.5000
1.5125
1.77
1.79
1 3/4-4 ACME
1.75
4
3G
1.5000
1.5125
1.77
1.79
1 3/4-4 ACME
1.75
4
4G
1.5000
1.5125
1.77
1.79
1 3/4-4 ACME
1.75
4
5G
1.5000
1.5125
1.77
1.79
2-4 ACME
2
4
2G
1.7500
1.7625
2.02
2.04
2-4 ACME
2
4
3G
1.7500
1.7625
2.02
2.04
2-4 ACME
2
4
4G
1.7500
1.7625
2.02
2.04
2-4 ACME
2
4
5G
1.7500
1.7625
2.02
2.04
2 1/4-3 ACME
2.25
3
2G
1.9167
1.9334
2.27
2.29
2 1/4-3 ACME
2.25
3
3G
1.9167
1.9334
2.27
2.29
2 1/4-3 ACME
2.25
3
4G
1.9167
1.9334
2.27
2.29
2 1/4-3 ACME
2.25
3
5G
1.9167
1.9334
2.27
2.29
2 1/2-3 ACME
2.5
3
2G
2.1667
2.1834
2.52
2.54
2 1/2-3 ACME
2.5
3
3G
2.1667
2.1834
2.52
2.54
2 1/2-3 ACME
2.5
3
4G
2.1667
2.1834
2.52
2.54
2 1/2-3 ACME
2.5
3
5G
2.1667
2.1834
2.52
2.54
2 3/4-3 ACME
2.75
3
2G
2.4169
2.4334
2.77
2.79
2 3/4-3 ACME
2.75
3
3G
2.4169
2.4334
2.77
2.79
2 3/4-3 ACME
2.75
3
4G
2.4169
2.4334
2.77
2.79
2 3/4-3 ACME
2.75
3
5G
2.4169
2.4334
2.77
2.79
3-2 ACME
3
2
2G
2.5000
2.5250
3.02
3.04
3-2 ACME
3
2
3G
2.5000
2.5250
3.02
3.04
3-2 ACME
3
2
4G
2.5000
2.5250
3.02
3.04
3-2 ACME
3
2
5G
2.5000
2.5250
3.02
3.04
3 1/2-2 ACME
3.5
2
2G
3.0000
3.0250
3.52
3.54
3 1/2-2 ACME
3.5
2
3G
3.0000
3.0250
3.52
3.54
3 1/2-2 ACME
3.5
2
4G
3.0000
3.0250
3.52
3.54
3 1/2-2 ACME
3.5
2
5G
3.0000
3.0250
3.52
3.54
4-2 ACME
4
2
2G
3.5000
3.5250
4.02
4.04
4-2 ACME
4
2
3G
3.5000
3.5250
4.02
4.04
4-2 ACME
4
2
4G
3.5000
3.5250
4.02
4.04
4-2 ACME
4
2
5G
3.5000
3.5250
4.02
4.04
4 1/2-2 ACME
4.5
2
2G
4.0000
4.0250
4.52
4.54
4 1/2-2 ACME
4.5
2
3G
4.0000
4.0250
4.52
4.54
4 1/2-2 ACME
4.5
2
4G
4.0000
4.0250
4.52
4.54
4 1/2-2 ACME
4.5
2
5G
4.0000
4.0250
4.52
4.54
5-2 ACME
5
2
2G
4.5000
4.5250
5.02
5.04
5-2 ACME
5
2
3G
4.5000
4.5250
5.02
5.04
5-2 ACME
5
2
4G
4.5000
4.5250
5.02
5.04
5-2 ACME
5
2
5G
4.5000
4.5250
5.02
5.04

 

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Designation
TPI
Tol.
Class
Pitch Dia.
Tap
Drill
Min.
Max.
1/4-16 ACME
16
2G
0.2188
0.2293
0.1875
1/4-16 ACME
16
3G
0.2188
0.2237
0.1875
1/4-16 ACME
16
4G
0.2188
0.2223
0.1875
1/4-16 ACME
16
5G
0.2188
0.2216
0.1875
5/16-14 ACME
14
2G
0.2768
0.2882
0.2411
5/16-14 ACME
14
3G
0.2768
0.2821
0.2411
5/16-14 ACME
14
4G
0.2768
0.2806
0.2411
5/16-14 ACME
14
5G
0.2768
0.2798
0.2411
3/8-12 ACME
12
2G
0.3333
0.3456
0.2917
3/8-12 ACME
12
3G
0.3333
0.3391
0.2917
3/8-12 ACME
12
4G
0.3333
0.3374
0.2917
3/8-12 ACME
12
5G
0.3333
0.3366
0.2917
7/16-12 ACME
12
2G
0.3958
0.4084
0.3542
7/16-12 ACME
12
3G
0.3958
0.4017
0.3542
7/16-12 ACME
12
4G
0.3958
0.4000
0.3542
7/16-12 ACME
12
5G
0.3958
0.3992
0.3542
1/2-10 ACME
10
2G
0.4500
0.4637
0.4000
1/2-10 ACME
10
3G
0.4500
0.4564
0.4000
1/2-10 ACME
10
4G
0.4500
0.4546
0.4000
1/2-10 ACME
10
5G
0.4500
0.4537
0.4000
5/8-8 ACME
8
2G
0.5625
0.5779
0.5000
5/8-8 ACME
8
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