UNC
thread
Name of thread
Thread/inch
PitchDiameter
1st priority
2nd priority
1 - 8 UNC
8 3.1750
25.400
1/8 1 - 7 UNC
7 3.6286
28.575
1/4 1 - 7 UNC
7 3.6286
31.750
3/8 1 - 6 UNC
6 4.2333
34.925
1/2 1 - 6 UNC
5 4.2333
38.100
3/4 1 - 5 UNC
1/2 4 5.0800
44.450
1/2 2 - 4 UNC
1/2 4 5.6444
50.800
1/41/2 2 - 4UNC
4 5.6444
57.150
1/2 2 - 4 UNC
4 6.3500
63.500
3/4 2 - 4 UNC
4 6.3500
69.850
3 - 4 UNC
4 6.3500
76.200
1/4 3 - 4 UNC
4 6.3500
82.550
1/2 3 - 4 UNC
4 6.3500
88.900
3/4 3 - 4 UNC
4 6.3500
95.250
4 - 4 UNC
4 6.3500
101.600
