UNF Thread ANSI/ASME B1.1

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

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

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