Assembly Parts - Purchase Partners
Assembly Parts - Purchase Partners
Assembly Parts - Purchase Partners
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Class 2B<br />
Internal Threads<br />
Min.<br />
Major<br />
Diameter<br />
Pitch<br />
Line<br />
Minor<br />
Diameter<br />
Axis of internal thread<br />
<strong>Purchase</strong> <strong>Partners</strong> INTERNAL THREADS - CLASS 2B ASME B1.1<br />
Nominal Size<br />
& Threads<br />
per Inch<br />
Series<br />
Designation<br />
Allowance<br />
Minor Diameter<br />
Pitch Diameter<br />
Major<br />
Diameter<br />
Min Max Min Max Tolerance Min<br />
0-80 UNF 0.0005 0.0465 0.0514 0.0519 0.0542 0.0023 0.0600<br />
1-64 UNC 0.0006 0.0561 0.0623 0.0629 0.0655 0.0026 0.0730<br />
1-72 UNF 0.0006 0.0580 0.0635 0.0640 0.0665 0.0025 0.0730<br />
2-56 UNC 0.0006 0.0667 0.0737 0.0744 0.0772 0.0028 0.0860<br />
3-48 UNC 0.0007 0.0764 0.0845 0.0855 0.0885 0.0030 0.0990<br />
4-40 UNC 0.0008 0.0849 0.0939 0.0958 0.0991 0.0033 0.1120<br />
4-48 UNF 0.0007 0.0894 0.0968 0.0985 0.1016 0.0031 0.1120<br />
5-40 UNC 0.0008 0.0979 0.1062 0.1088 0.1121 0.0033 0.1250<br />
6-32 UNC 0.0008 0.104 0.114 0.1177 0.1214 0.0037 0.1380<br />
8-32 UNC 0.0009 0.130 0.139 0.1437 0.1475 0.0038 0.1640<br />
10-24 UNC 0.0010 0.145 0.156 0.1629 0.1672 0.0043 0.1900<br />
10-32 UNF 0.0009 0.156 0.164 0.1697 0.1736 0.0039 0.1900<br />
12-24 UNC 0.0010 0.171 0.181 0.1889 0.1933 0.0044 0.2160<br />
1/4-20 UNC 0.0011 0.196 0.207 0.2175 0.2224 0.0049 0.2500<br />
1/4-28 UNF 0.0010 0.211 0.220 0.2268 0.2311 0.0043 0.2500<br />
5/16-18 UNC 0.0012 0.252 0.265 0.2764 0.2817 0.0053 0.3125<br />
5/16-24 UNF 0.0011 0.267 0.277 0.2854 0.2902 0.0048 0.3125<br />
3/8-16 UNC 0.0013 0.307 0.321 0.3344 0.3401 0.0057 0.3750<br />
3/8-24 UNF 0.0011 0.330 0.340 0.3479 0.3528 0.0049 0.3750<br />
7/16-14 UNC 0.0014 0.360 0.376 0.3911 0.3972 0.0061 0.4375<br />
7/16-20 UNF 0.0013 0.383 0.395 0.4050 0.4104 0.0054 0.4375<br />
1/2-13 UNC 0.0015 0.417 0.434 0.4500 0.4565 0.0065 0.5000<br />
1/2-20 UNF 0.0013 0.446 0.457 0.4675 0.4731 0.0056 0.5000<br />
9/16-12 UNC 0.0016 0.472 0.490 0.5084 0.5152 0.0068 0.5625<br />
9/16-18 UNF 0.0014 0.502 0.515 0.5264 0.5323 0.0059 0.5625<br />
5/8-11 UNC 0.0016 0.527 0.546 0.5660 0.5732 0.0072 0.6250<br />
5/8-18 UNF 0.0014 0.565 0.578 0.5889 0.5949 0.0060 0.6250<br />
3/4-10 UNC 0.0018 0.642 0.663 0.6850 0.6927 0.0077 0.7500<br />
3/4-16 UNF 0.0015 0.682 0.696 0.7094 0.7159 0.0065 0.7500<br />
7/8-9 UNC 0.0019 0.755 0.778 0.8028 0.8110 0.0082 0.8750<br />
7/8-14 UNF 0.0016 0.798 0.814 0.8286 0.8356 0.0070 0.8750
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