Thread series displays various diameter/pitch combinations that are measured by the number of threads per inch (TPI), applied to a single diameter. Includes both standard screw and metric screw thread.
STANDARD SCREW THREAD | |||||||
---|---|---|---|---|---|---|---|
NOMINAL | STANDARD COARSE | FINE | EXTRA FINE | ACME | |||
Dia (in.) | SIZE | UNC | UN | UNF | UNS | UNEF | |
0.060 | 0 | 80 | |||||
0.073 | 1 | 64 | 72 | ||||
0.086 | 2 | 56 | 64 | ||||
0.099 | 3 | 48 | 56 | ||||
0.112 | 4 | 40 | 48 | ||||
0.125 | 5 | 40 | 44 | ||||
0.138 | 6 | 32 | 40 | ||||
0.164 | 8 | 32 | 36 | ||||
0.190 | 10 | 24 | 32 | ||||
0.216 | 12 | 24 | 28 | 80 | |||
0.250 | 1/4 | 20 | 28 | 32 | 16 | ||
0.3125 | 5/16 | 18 | 24 | 32 | 14 | ||
0.375 | 3/8 | 16 | 24 | 32 | 12 | ||
0.4375 | 7/16 | 14 | 20 | 28 | 12 | ||
0.500 | 1/2 | 13 | 20 | 28 | 10 | ||
0.5625 | 9/16 | 12 | 18 | 24 | |||
0.625 | 5/8 | 11 | 18 | 24 | 8 | ||
0.750 | 3/4 | 10 | 16 | 20 | 6 | ||
0.875 | 7/8 | 9 | 14 | 20 | 6 | ||
1.000 | 1 | 8 | 12 | 14 | 20 | 5 | |
1.125 | 1 1/8 | 7 | 8 | 12 | 18 | 5 | |
1.250 | 1 1/4 | 7 | 8 | 12 | 18 | 5 | |
1.375 | 1 3/8 | 6 | 8 | 12 | 18 | 4 | |
1.500 | 1 1/2 | 6 | 8 | 12 | 18 | 4 | |
1.625 | 1 5/8 | 8 | 18 | 4 | |||
1.750 | 1 3/4 | 5 | 8 | 4 | |||
1.875 | 1 7/8 | 8 | 4 | ||||
2.000 | 2 | 4 1/2 | 8 | 4 | |||
2.250 | 2 1/4 | 4 1/2 | 8 | 3 | |||
2.500 | 2 1/2 | 4 | 8 | 3 | |||
2.750 | 2 3/4 | 4 | 8 | 3 | |||
3.000 | 3 | 4 | 8 | 2 | |||
3.250 | 3 1/4 | 4 | 8 | 2 | |||
3.500 | 3 1/2 | 4 | 8 | 2 | |||
3.750 | 3 3/4 | 4 | 8 | 2 | |||
4.000 | 4 | 4 | 8 | 2 |
METRIC SCREW THREAD | ||
---|---|---|
Nominal Dia. (mil.) | STANDARD COARSE | FINE |
0.5 | 0.125 | |
1 | 0.250 | |
1.2 | 0.250 | |
1.4 | 0.300 | |
1.6 | 0.350 | |
1.8 | 0.350 | |
2 | 0.400 | |
2.2 | 0.450 | |
2.5 | 0.450 | |
2.6 | 0.450 | |
3 | 0.500 | |
3.5 | 0.600 | |
4 | 0.700 | |
5 | 0.800 | |
6 | 1.000 | |
7 | 1.000 | |
8 | 1.250 | 1.000 |
10 | 1.500 | 1.250 |
12 | 1.750 | 1.250 |
14 | 2.000 | 1.500 |
16 | 2.000 | 1.500 |
18 | 2.500 | 1.500 |
20 | 2.500 | 1.500 |
22 | 2.500 | 1.500 |
24 | 3.000 | 2.000 |
27 | 3.000 | 2.000 |
30 | 3.500 | 2.000 |
33 | 3.500 | 2.000 |
36 | 4.000 | 3.000 |
39 | 4.000 | 3.000 |
42 | 4.500 | 3.000 |
45 | 4.500 | 3.000 |
48 | 5.000 | 3.000 |
PIPE THREAD | ||
---|---|---|
Nominal | Standard Pipe Size | Threads (per in.) |
0.313″ | 1/16″ | 27 |
0.405″ | 1/8″ | 27 |
0.540″ | 1/4″ | 18 |
0.675″ | 3/8″ | 18 |
0.840″ | 1/2″ | 14 |
1.050″ | 3/4″ | 14 |
1.315″ | 1″ | 11 1/2 |
1.660″ | 1-1/4″ | 11 1/2 |
1.900″ | 1-1/2″ | 11 1/2 |
2.375″ | 2″ | 11 1/2 |
2.875″ | 2-1/2″ | 8 |
3.500″ | 3″ | 8 |
4.000″ | 3-1/2″ | 8 |
4.500″ | 4″ | 8 |
5.563″ | 5″ | 8 |
6.625″ | 6″ | 8 |
8.625″ | 8″ | 8 |
10.750″ | 10″ | 8 |
12.750″ | 12″ | 8 |
14.000″ | 14″ | 8 |
16.000″ | 16″ | 8 |