Unified Thread Series 16 TPI ANSI/ASME B1.1

16-UN - Unified Extra Fine Thread, which is used for special purposes.
The flank angle is 60°.

Nominal
Diameter
Major
Diameter
Inch
Major
Diameter
mm
Tapping
Drill Size
mm
TPI Pitch
mm
7/16" - 16-UN 0.4375 11.112 9.576 16 1.587
1/2" - 16-UN 0.5000 12.700 11.200 16 1.587
9/16" - 16-UN 0.5625 14.288 12.800 16 1.587
5/8" - 16-UN 0.6250 15.875 14.400 16 1.587
11/16" - 16-UN 0.6875 17.462 16.000 16 1.587
13/16" - 16-UN 0.8125 20.637 19.100 16 1.587
7/8" - 16-UN 0.8750 22.225 20.700 16 1.587
15/16" - 16-UN 0.9375 23.813 22.300 16 1.587
1" - 16-UN 1.0000 25.400 23.900 16 1.587
1 1/16" - 16-UN 1.0625 26.987 25.500 16 1.587
1 1/8" - 16-UN 1.1250 28.575 27.100 16 1.587
1 3/16" - 16-UN 1.1875 30.162 28.700 16 1.587
1 1/4" - 16-UN 1.2500 31.750 30.300 16 1.587
1 5/16" - 16-UN 1.3125 33.337 31.750 16 1.587
1 3/8" - 16-UN 1.3750 34.925 33.400 16 1.587
1 7/16" - 16-UN 1.4375 36.512 35.000 16 1.587
1 1/2" - 16-UN 1.5000 38.100 36.600 16 1.587
1 9/16" - 16-UN 1.5625 39.688 38.200 16 1.587
1 5/8" - 16-UN 1.6250 41.275 39.800 16 1.587
1 11/16" - 16-UN 1.6875 42.862 41.350 16 1.587
1 3/4" - 16-UN 1.7500 44.450 43.000 16 1.587
1 13/16" - 16-UN 1.8125 46.037 44.500 16 1.587
1 7/8" - 16-UN 1.8750 47.625 46.100 16 1.587
1 15/16" - 16-UN 1.9375 49.212 47.700 16 1.587
2" - 16-UN 2.0000 50.800 49.300 16 1.587
2 1/8" - 16-UN 2.1250 53.975 52.600 16 1.587
2 1/4" - 16-UN 2.2500 57.150 55.650 16 1.587
2 3/8" - 16-UN 2.3750 60.325 58.850 16 1.587
2 1/2" - 16-UN 2.5000 63.500 62.000 16 1.587
2 5/8" - 16-UN 2.6250 66.675 65.150 16 1.587
2 3/4" - 16-UN 2.7500 69.850 68.350 16 1.587
2 7/8" - 16-UN 2.8750 73.025 71.500 16 1.587
3" - 16-UN 3.0000 76.200 74.700 16 1.587
3 1/8" - 16-UN 3.1250 79.375 77.850 16 1.587
3 1/4" - 16-UN 3.2500 82.550 81.000 16 1.587
3 3/8" - 16-UN 3.3750 85.725 84.200 16 1.587
3 1/2" - 16-UN 3.5000 88.900 87.400 16 1.587
3 5/8" - 16-UN 3.6250 92.075 90.550 16 1.587
3 3/4" - 16-UN 3.7500 95.250 93.750 16 1.587
3 7/8" - 16-UN 3.8750 98.425 96.900 16 1.587
4" - 16-UN 4.0000 101.600 100.100 16 1.587
4 1/8" - 16-UN 4.1250 104.775 103.300 16 1.587
4 1/4" - 16-UN 4.2500 107.950 106.450 16 1.587
4 3/8" - 16-UN 4.3750 111.125 109.600 16 1.587
4 1/2" - 16-UN 4.5000 114.300 112.800 16 1.587
4 5/8" - 16-UN 4.6250 117.475 116.000 16 1.587
4 3/4" - 16-UN 4.7500 120.650 119.150 16 1.587
4 7/8" - 16-UN 4.8750 123.825 122.300 16 1.587
5" - 16-UN 5.0000 127.000 125.500 16 1.587
5 1/4" - 16-UN 5.2500 133.350 131.850 16 1.587
5 1/2" - 16-UN 5.5000 139.700 138.200 16 1.587
5 5/8" - 16-UN 5.6250 142.875 141.350 16 1.587
5 7/8" - 16-UN 5.8750 149.225 147.750 16 1.587
6" - 16-UN 6.0000 152.400 150.900 16 1.587