Example - Typical designation of an UNC thread
UNF threads ANSI B1.1:
Major Diameter (in) | Threads per inch (tpi) | Major Diameter | Tap Drill Size (mm) | Pitch (mm) | |
---|---|---|---|---|---|
(in) | (mm) | ||||
#0 - 80 | 80 | 0.060 | 1.524 | 1.25 | 0.317 |
#1 - 72 | 72 | 0.073 | 1.854 | 1.55 | 0.353 |
#2 - 64 | 64 | 0.086 | 2.184 | 1.90 | 0.397 |
#3 - 56 | 56 | 0.099 | 2.515 | 2.15 | 0.453 |
#4 - 48 | 48 | 0.112 | 2.845 | 2.40 | 0.529 |
#5 - 44 | 44 | 0.125 | 3.175 | 2.70 | 0.577 |
#6 - 40 | 40 | 0.138 | 3.505 | 2.95 | 0.635 |
#8 - 36 | 36 | 0.164 | 4.166 | 3.50 | 0.705 |
#10 - 32 | 32 | 0.190 | 4.826 | 4.10 | 0.794 |
#12 - 28 | 28 | 0.216 | 5.486 | 4.70 | 0.907 |
1/4" - 28 | 28 | 0.250 | 6.350 | 5.50 | 0.907 |
5/16" - 24 | 24 | 0.313 | 7.938 | 6.90 | 1.058 |
3/8" - 24 | 24 | 0.375 | 9.525 | 8.50 | 1.058 |
7/16" - 20 | 20 | 0.438 | 11.112 | 9.90 | 1.270 |
1/2" - 20 | 20 | 0.500 | 12.700 | 11.50 | 1.270 |
9/16" - 18 | 18 | 0.563 | 14.288 | 12.90 | 1.411 |
5/8" - 18 | 18 | 0.625 | 15.875 | 14.50 | 1.411 |
3/4" - 16 | 16 | 0.750 | 19.050 | 17.50 | 1.587 |
7/8" - 14 | 14 | 0.875 | 22.225 | 20.40 | 1.814 |
1" - 12 | 12 | 1.000 | 25.400 | 23.25 | 2.117 |
1 1/8" - 12 | 12 | 1.125 | 28.575 | 26.50 | 2.117 |
1 1/4" - 12 | 12 | 1.250 | 31.750 | 29.50 | 2.117 |
1 3/8" - 12 | 12 | 1.375 | 34.925 | 32.75 | 2.117 |
1 1/2" - 12 | 12 | 1.500 | 38.100 | 36.00 | 2.117 |
Example - Typical designation of an UNF thread
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