UNC Thread ANSI/ASME B1.1

UNC - Unified Coarse Thread. The old definition NC is comparable with the metric thread. The new term UNC is comparable with the ISO metric thread. NC and UNC threads are interchangeable, in an analogous manner like the metric and the ISO metric thread.
The thread angle is 60°.

Nominal
Diameter		 Major
Diameter
Inch		 Major
Diameter
mm		 Tapping
Drill Size
mm		 TPI Pitch
mm
#1 - 64 UNC 0.073 1.854 1.50 64 0.397
#2 - 56 UNC 0.086 2.184 1.78 56 0.453
#3 - 48 UNC 0.099 2.515 2.05 48 0.529
#4 - 40 UNC 0.112 2.845 2.27 40 0.635
#5 - 40 UNC 0.125 3.175 2.59 40 0.635
#6 - 32 UNC 0.138 3.505 2.77 32 0.794
#8 - 32 UNC 0.164 4.166 3.42 32 0.794
#10 - 24 UNC 0.190 4.826 3.82 24 1.058
#12 - 24 UNC 0.216 5.486 4.47 24 1.058
1/4" - 20 UNC 0.250 6.350 5.11 20 1.270
5/16" - 18 UNC 0.313 7.938 6.55 18 1.411
3/8" - 16 UNC 0.375 9.525 7.95 16 1.587
7/16" - 14 UNC 0.438 11.112 9.30 14 1.814
1/2" - 13 UNC 0.500 12.700 10.73 13 1.954
9/16" - 12 UNC 0.563 14.288 12.15 12 2.117
5/8" - 11 UNC 0.625 15.875 13.53 11 2.309
3/4" - 10 UNC 0.750 19.050 16.46 10 2.540
7/8" - 9 UNC 0.875 22.225 19.34 9 2.822
1" - 8 UNC 1.000 25.400 22.15 8 3.175
1 1/8" - 7 UNC 1.125 28.575 24.87 7 3.628
1 1/4" - 7 UNC 1.250 31.750 28.05 7 3.628
1 3/8" - 6 UNC 1.375 34.925 30.60 6 4.233
1 1/2" - 6 UNC 1.500 38.100 33.70 6 4.233
1 3/4" - 5 UNC 1.750 44.450 39.26 5 5.080
2" - 4 1/2 UNC 2.000 50.800 45.03 4.5 5.644
2 1/4" - 4 1/2 UNC 2.250 57.150 51.38 4.5 5.644
2 1/2" - 4 UNC 2.500 63.500 57.00 4 6.350
2 3/4" - 4 UNC 2.750 69.850 63.36 4 6.350
3" - 4 UNC 3.000 76.200 69.71 4 6.350
3 1/4" - 4 UNC 3.250 82.550 76.06 4 6.350
3 1/2" - 4 UNC 3.500 88.900 82.41 4 6.350
3 3/4" - 4 UNC 3.750 95.250 88.76 4 6.350
4" - 4 UNC 4.000 101.600 95.11 4 6.350

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