Mechanical Engineering Drawing Workshop

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