UN.unc.UNF Internal Threads

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Internal Threads (Class 2B)
ASME B1.1

Nomin
Minor
al Size
Series
Diameter
&
Designati
Thread
on
s per
Min Max
Inch

Pitch Diameter

Min

Max

Toleran
ce

Major
Diamet
er
Min

0- 80

UNF

0.046 0.051 0.051 0.054
0.0023
5
4
9
2

0.0600

1- 64

UNC

0.056 0.062 0.062 0.065
0.0026
1
3
9
5

0.0730

1- 72

UNF

0.058 0.063 0.064 0.066
0.0025
0
5
0
5

0.0730

2- 56

UNC

0.066 0.073 0.074 0.077
0.0028
7
7
4
2

0.0860

2- 64

UNF

0.069 0.075 0.075 0.078
0.0027
1
3
9
6

0.0860

3- 48

UNC

0.076 0.084 0.085 0.088
0.0030
4
5
5
5

0.0990

3- 56

UNF

0.079
0.087 0.090
0.865
0.0028
7
4
2

0.0990

4- 40

UNC

0.084 0.093 0.095 0.099
0.0033
9
9
8
1

0.1120

4- 48

UNF

0.089 0.096 0.098 0.101
0.0031
4
8
5
6

0.1120

5- 40

UNC

0.097 0.106 0.108 0.112
0.0033
9
2
8
1

0.1250

5- 44

UNF

0.100 0.107 0.110 0.113
0.0032
4
9
2
4

0.1250

6- 32

UNC

0.104 0.114 0.117 0.121 0.0037

0.1380

7

4

6- 40

UNF

0.111 0.119

0.121 0.125
0.0034
8
2

0.1380

8- 32

UNC

0.130 0.139

0.143 0.147
0.0038
7
5

0.1640

8- 36

UNF

0.134 0.142

0.146 0.149
0.0036
0
6

0.1640

10- 24

UNC

0.145 0.156

0.162 0.167
0.0043
9
2

0.1900

10- 32

UNF

0.156 0.164

0.169 0.173
0.0039
7
6

0.1900

12- 24

UNC

0.171 0.181

0.188 0.193
0.0044
9
3

0.2160

12- 28

UNF

0.177 0.186

0.192 0.197
0.0042
8
0

0.2160

1/4- 20

UNC

0.196 0.207

0.217 0.222
0.0049
5
4

0.2500

1/4- 28

UNF

0.211 0.220

0.226 0.231
0.0043
8
1

0.2500

5/1618

UNC

0.252 0.265

0.276 0.281
0.0053
4
7

0.3125

5/1624

UNF

0.267 0.277

0.285 0.290
0.0048
4
2

0.3125

3/8- 16

UNC

0.307 0.321

0.334 0.340
0.0057
4
1

0.3750

3/8- 24

UNF

0.330 0.340

0.347 0.352
0.0049
9
8

0.3750

7/1614

UNC

0.360 0.376

0.391 0.397
0.0061
1
2

0.4375

7/1620

UNF

0.383 0.395

0.405 0.410
0.0054
0
4

0.4375

1/2- 13

UNC

0.417 0.434

0.450 0.456
0.0065
0
5

0.5000

1/2- 20

UNF

0.446 0.457

0.467 0.473
0.0056
5
1

0.5000

9/1612

UNC

0.472 0.490

0.508 0.515
0.0068
4
2

0.5625

9/1618

UNF

0.502 0.515

0.526 0.532
0.0059
4
3

0.5625

5/8- 11

UNC

0.527 0.546

0.566 0.573
0.0072
0
2

0.6250

5/8- 18

UNF

0.565 0.578

0.588 0.594
0.0060
9
9

0.6250

3/4- 10

UNC

0.642 0.663

0.685 0.692
0.0077
0
7

0.7500

3/4- 16

UNF

0.682 0.696

0.709 0.715
0.0065
4
9

0.7500

7/8- 9

UNC

0.755 0.778

0.802 0.811
0.0082
8
0

0.8750

7/8- 14

UNF

0.798 0.814

0.828 0.835
0.0070
6
6

0.8750

1- 8

UNC

0.865 0.890

0.918 0.927
0.0088
8
6

1.0000

1- 12

UNF

0.910 0.928

0.945 0.953
0.0076
9
5

1.0000

1- 14

UNS

0.923 0.938

0.953 0.960
0.0073
6
9

1.0000

1 1/87

UNC

0.970 0.998

1.032 1.041
0.0094
2
6

1.1250

1 1/88

UN

0.990 1.015

1.043 1.052
0.0090
8
8

1.1250

1 1/812

UNF

1.035 1.053

1.070 1.078
0.0078
9
7

1.1250

1 1/47

UNC

1.095 1.123

1.157 1.166
0.0096
2
8

1.2500

1 1/48

UN

1.115 1.140

1.168 1.178
0.0092
8
0

1.2500

1 1/412

UNF

1.160 1.178

1.195 1.203
0.0080
9
9

1.2500

1 3/86

UNC

1.195 1.225

1.266 1.277
0.0104
7
1

1.3750

1 3/88

UN

1.240 1.265

1.293 1.303
0.0093
8
1

1.3750

1 3/812

UNF

1.285 1.303

1.320 1.329
0.0082
9
1

1.3750

1 1/26

UNC

1.320 1.350

1.391 1.402
0.0105
7
2

1.5000

1 1/28

UN

1.365 1.390

1.418 1.428
0.0095
8
3

1.5000

1 1/212

UNF

1.410 1.428

1.445 1.454
0.0083
9
2

1.5000

1 5/88

UN

1.490 1.515

1.543 1.553
0.0097
8
5

1.6250

1 3/45

UNC

1.534 1.568

1.620 1.631
0.0116
1
7

1.7500

1 3/48

UN

1.615 1.640

1.668 1.678
0.0098
8
6

1.7500

1 7/88

UN

1.740 1.765

1.793 1.803
0.0100
8
8

1.8750

2- 4
1/2

UNC

1.759 1.795

1.855 1.868
0.0124
7
1

2.0000

2- 8

UN

1.865 1.890

1.918 1.928
0.0101
8
9

2.0000

2 1/44 1/2

UNC

2.009 2.045

2.105 2.118
0.0126
7
3

2.2500

2 1/48

UN

2.115 2.140

2.168 2.179
0.0104
8
2

2.2500

2 1/24

UNC

2.229 2.267

2.337 2.351
0.0135
6
1

2.5000

2 1/28

UN

2.365 2.390

2.418 2.429
0.0106
8
4

2.5000

2 3/44

UNC

2.479 2.517

2.587 2.601
0.0137
6
3

2.7500

2 3/48

UN

2.615 2.640

2.668 2.679
0.0108
8
6

2.7500

3- 4

UNC

2.729 2.767

2.837 2.851
0.0139
6
5

3.0000

3- 8

UN

2.865 2.890

2.918 2.929
0.0111
8
9

3.0000

3 1/44

UNC

2.979 3.017

3.087 3.101
0.0141
6
7

3.2500

3 1/48

UN

3.115 3.140

3.168 3.180
0.0113
8
1

3.2500

3 1/24

UNC

3.229 3.267

3.337 3.351
0.0143
6
9

3.5000

3 1/28

UN

3.365 3.390

3.418 3.430
0.0115
8
3

3.5000

3 3/44

UNC

3.479 3.517

3.587 3.602
0.0145
6
1

3.7500

3 3/48

UN

3.615 3.640

3.668 3.680
0.0117
8
5

3.7500

4- 4

UNC

3.729 3.767

3.837 3.852
0.0147
6
3

4.0000

4- 8

UN

3.865 3.890

3.918 3.930
0.0119
8
7

4.0000

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