Specifications of International Thread Standards

UNF - Unified National Fine Thread. Similar to UNC. UNC and UNF threads are the choices for the customary screws and nuts.
The flank angle is 60°.

Nominal
Diameter
Major
Diameter
Inch
Major
Diameter
mm
Tapping
Drill Size
mm
TPIPitch
mm
#0 - 80 UNF0.0601.5241.25800.317
#1 - 72 UNF0.0731.8541.55720.353
#2 - 64 UNF0.0862.1841.90640.397
#3 - 56 UNF0.0992.5152.15560.453
#4 - 48 UNF0.1122.8452.40480.529
#5 - 44 UNF0.1253.1752.70440.577
#6 - 40 UNF0.1383.5052.95400.635
#8 - 36 UNF0.1644.1663.50360.705
#10 - 32 UNF0.1904.8264.10320.794
#12 - 28 UNF0.2165.4864.70280.907
1/4" - 28 UNF0.2506.3505.50280.907
5/16" - 24 UNF0.3137.9386.90241.058
3/8" - 24 UNF0.3759.5258.50241.058
7/16" - 20 UNF0.43811.1129.90201.270
1/2" - 20 UNF0.50012.70011.50201.270
9/16" - 18 UNF0.56314.28812.90181.411
5/8" - 18 UNF0.62515.87514.50181.411
3/4" - 16 UNF0.75019.05017.50161.587
7/8" - 14 UNF0.87522.22520.40141.814
1" - 12 UNF1.00025.40023.25122.117
1 1/8" - 12 UNF1.12528.57526.50122.117
1 1/4" - 12 UNF1.25031.75029.50122.117
1 3/8" - 12 UNF1.37534.92532.75122.117
1 1/2" - 12 UNF1.50038.10036.00122.117
UNF Thread