Specifications of International Thread Standards

UNR - Unified Thread Series with external thread controlled root radius.
The flank angle is 60°.

Nominal
Diameter
Major
Diameter
Inch
Major
Diameter
mm
Tapping
Drill Size
mm
TPIPitch
mm
5/16" - 20 UNR0.31257.9386.700201.270
5/16" - 28 UNR0.31257.9387.100280.907
3/8" - 20 UNR0.37509.5258.300201.270
3/8" - 28 UNR0.37509.5258.700280.907
7/16" - 16 UNR0.437511.1129.580161.587
7/16" - 32 UNR0.437511.11210.400320.794
1/2" - 16 UNR0.500012.70011.200161.587
1/2" - 32 UNR0.500012.70012.000320.794
9/16" - 16 UNR0.562514.28812.800161.587
9/16" - 20 UNR0.562514.28813.050201.270
9/16" - 28 UNR0.562514.28813.490280.907
9/16" - 32 UNR0.562514.28813.600320.794
5/8" - 12 UNR0.625015.87513.890122.117
5/8" - 16 UNR0.625015.87514.400161.587
5/8" - 20 UNR0.625015.87514.680201.270
5/8" - 28 UNR0.625015.87515.000280.907
5/8" - 32 UNR0.625015.87515.200320.794
11/16" - 12 UNR0.687517.46215.400122.117
11/16" - 16 UNR0.687517.46216.000161.587
11/16" - 20 UNR0.687517.46216.250201.270
11/16" - 28 UNR0.687517.46216.600280.907
11/16" - 32 UNR0.687517.46216.700320.794
3/4" - 12 UNR0.750019.05017.000122.117
3/4" - 28 UNR0.750019.05018.200280.907
3/4" - 32 UNR0.750019.05018.300320.794
13/16" - 12 UNR0.051120.63718.600122.117
13/16" - 16 UNR0.051120.63719.100161.587
13/16" - 28 UNR0.051120.63719.800280.907
13/16" - 32 UNR0.051112.70019.900320.794
7/8" - 12 UNR0.875022.22520.200122.117
7/8" - 16 UNR0.875022.22520.750161.587
7/8" - 28 UNR0.875022.22521.400280.907
7/8" - 32 UNR0.875022.22521.500320.794
15/16" - 12 UNR0.937515.87521.750122.117
15/16" - 16 UNR0.937523.81322.300161.587
15/16" - 28 UNR0.937523.81323.000280.907
15/16" - 32 UNR0.937523.81323.250320.794
1" - 16 UNR1.000025.40024.000161.587
1" - 28 UNR1.000025.40024.600280.907
1" - 32 UNR1.000025.40024.750320.794
1 1/16" - 8 UNR1.062526.98724.00083.175
1 1/16" - 12 UNR1.062526.98725.000122.117
1 1/16" - 16 UNR1.062526.98725.500161.587
1 1/16" - 20 UNR1.062526.98725.750201.270
1 1/16" - 28 UNR1.062526.98726.250280.907
1 1/8" - 8 UNR1.125028.57525.50083.175
1 1/8" - 16 UNR1.125028.57527.250161.587
1 1/8" - 20 UNR1.125028.57527.500201.270
1 1/8" - 28 UNR1.125028.57527.750280.907
1 3/16" - 8 UNR1.187530.16227.25083.175
1 3/16" - 12 UNR1.187530.16228.250122.117
1 3/16" - 16 UNR1.187530.16228.750161.587
1 3/16" - 20 UNR1.187530.16229.000201.270
1 3/16" - 28 UNR1.187530.16229.500280.907
1 1/4" - 8 UNR1.250031.75028.75083.175
1 1/4" - 16 UNR1.250031.75030.250161.587
1 1/4" - 20 UNR1.250031.75030.750201.270
1 1/4" - 28 UNR1.250031.75031.000280.907
1 5/16" - 8 UNR1.312533.33730.25083.175
1 5/16" - 12 UNR1.312533.33731.500122.117
1 5/16" - 16 UNR1.312533.33732.000161.587
1 5/16" - 20 UNR1.625033.33730.250201.270
1 5/16" - 28 UNR1.312533.33742.500280.907
1 3/8" - 8 UNR1.375034.92532.00083.175
1 3/8" - 16 UNR1.375034.92533.500161.587
1 3/8" - 20 UNR1.375034.92534.000201.270
1 3/8" - 28 UNR1.375034.92534.500280.907
1 7/16" - 6 UNR1.437536.51232.50064.233
1 7/16" - 8 UNR1.437536.51233.50083.175
1 7/16" - 12 UNR1.437536.51234.500122.117
1 7/16" - 16 UNR1.437536.51236.000161.587
1 7/16" - 20 UNR1.437536.51235.500201.270
1 7/16" - 28 UNR1.437536.51235.750280.907
1 1/2" - 8 UNR1.500038.10035.25083.175
1 1/2" - 16 UNR1.500038.10036.500161.587
1 1/2" - - 20 UNR1.500038.10036.900201.270
1 1/2" - 28 UNR1.500038.10037.310280.907
1 9/16" - 6 UNR1.562539.68835.72064.233
1 9/16" - 8 UNR1.562539.68836.91083.175
1 9/16" - 12 UNR1.562539.68837.710122.117
1 9/16" - 16 UNR1.562539.68838.500161.587
1 9/16" - 20 UNR1.562539.68838.500201.270
1 5/8" - 6 UNR1.620041.14837.31064.233
1 5/8" - 8 UNR1.620041.14838.50083.175
1 5/8" - 12 UNR1.620041.14839.300122.117
1 5/8" - 16 UNR1.620041.14840.000161.587
1 5/8" - 20 UNR1.620041.14840.100201.270
1 11/16" - 6 UNR1.687542.86238.90064.233
1 11/16" - 8 UNR1.687542.86240.00083.175
1 11/16" - 12 UNR1.687542.86240.900122.117
1 11/16" - 16 UNR1.687542.86241.500161.587
1 11/16" - 20 UNR1.687542.86241.700201.270
1 3/4" - 6 UNR1.750044.45040.50064.233
1 3/4" - 8 UNR1.750044.45041.50083.175
1 3/4" - 12 UNR1.750044.45042.470122.117
1 3/4" - 16 UNR1.750044.45043.000161.587
1 3/4" - 20 UNR1.750044.45043.260201.270
1 13/16" - 6 UNR1.812546.03742.00064.233
1 13/16" - 8 UNR1.812546.03743.00083.175
1 13/16" - 12 UNR1.812546.03744.000122.117
1 13/16" - 16 UNR1.812546.03744.500161.587
1 13/16" - 20 UNR1.812546.03744.850201.270
1 7/8" - 6 UNR1.875047.62543.50064.233
1 7/8" - 8 UNR1.875047.62544.85083.175
1 7/8" - 12 UNR1.875047.62545.650122.117
1 7/8" - 16 UNR1.875047.62546.100161.587
1 7/8" - 20 UNR1.875047.62546.430101.270
1 15/16" - 6 UNR1.937549.21245.25064.233
1 15/16" - 8 UNR1.937549.21246.43083.175
1 15/16" - 12 UNR1.937549.21247.250122.117
1 15/16" - 16 UNR1.937549.21248.000161.587
1 15/16" - 20 UNR1.937549.21248.000201.270
2" - 6 UNR2.000050.80046.85064.233
2" - 8 UNR2.000050.80048.00083.175
2" - 12 UNR2.000050.80048.820122.540
2" - 16 UNR2.000050.80049.500161.587
2" - 20 UNR2.000050.80049.610201.270
2 1/8" - 6 UNR2.125053.97550.00064.233
2 1/8" - 8 UNR2.125053.97551.00083.175
2 1/8" - 12 UNR2.125053.97552.000122.117
2 1/8" - 16 UNR2.125053.97552.500161.587
2 1/8" - 20 UNR2.125053.97552.780201.270
2 1/4" - 6 UNR2.250057.15053.20064.233
2 1/4" - 8 UNR2.250057.15054.37083.175
2 1/4" - 12 UNR2.250057.15055.200122.117
2 1/4" - 16 UNR2.250057.15055.950161.587
2 1/4" - 20 UNR2.250057.15055.950201.270
2 3/8" - 6 UNR2.375060.32556.35064.233
2 3/8" - 8 UNR2.375060.32557.50083.175
2 3/8" - 12 UNR2.375060.32558.340122.117
2 3/8" - 16 UNR2.375060.32559.000161.587
2 3/8" - 20 UNR2.375060.32559.150201.270
2 1/2" - 6 UNR2.500063.50059.50064.233
2 1/2" - 8 UNR2.500063.50060.50083.175
2 1/2" - 12 UNR2.500063.50061.500122.117
2 1/2" - 16 UNR2.500063.50062.500161.587
2 1/2" - 20 UNR2.500063.50062.310201.270
2 5/8" - 6 UNR2.625066.67562.71064.233
2 5/8" - 8 UNR2.625066.67563.90083.175
2 5/8" - 12 UNR2.625066.67564.700122.117
2 5/8" - 16 UNR2.625066.67565.500161.587
2 5/8" - 20 UNR2.625066.67565.500201.270
2 3/4" - 6 UNR2.750069.85065.90064.233
2 3/4" - 8 UNR2.750069.85067.00083.175
2 3/4" - 12 UNR2.750069.85067.900122.117
2 3/4" - 16 UNR2.750069.85068.500161.587
2 3/4" - 20 UNR2.750069.85068.650201.270
2 7/8" - 6 UNR2.875073.02569.00064.233
2 7/8" - 8 UNR2.875073.02570.00083.175
2 7/8" - 12 UNR2.875073.02571.000122.117
2 7/8" - 16 UNR2.875073.02571.500161.587
2 7/8" - 20 UNR2.875073.02571.850201.270
3" - 6 UNR3.000076.20072.25064.233
3" - 8 UNR3.000076.20073.42083.175
3" - 12 UNR3.000076.20074.200122.117
3" - 16 UNR3.000076.20074.650161.587
3" - 20 UNR3.000076.20075.000201.270
3 1/8" - 6 UNR3.125079.37575.40064.233
3 1/8" - 8 UNR3.125079.37576.30083.175
3 1/8" - 12 UNR3.125079.37577.350122.117
3 1/8" - 16 UNR3.125079.37577.850161.587
3 1/4" - 6 UNR3.250082.55078.50064.233
3 1/4" - 8 UNR3.250082.55079.50083.175
3 1/4" - 12 UNR3.250082.55080.500122.117
3 1/4" - 16 UNR3.250082.55081.000161.587
3 3/8" - 6 UNR3.375085.72581.75064.233
3 3/8" - 8 UNR3.375085.72582.75083.175
3 3/8" - 12 UNR3.375085.72583.750122.117
3 3/8" - 16 UNR3.375085.72584.250161.587
3 1/2" - 6 UNR3.500088.90084.00064.233
3 1/2" - 8 UNR3.500088.90085.90083.175
3 1/2" - 12 UNR3.500088.90086.850122.117
3 1/2" - 16 UNR3.500088.90087.400161.587
3 5/8" - 6 UNR6.000092.07588.10064.233
3 5/8" - 8 UNR3.625092.07589.00083.175
3 5/8" - 12 UNR3.625092.07590.100122.117
3 5/8" - 16 UNR3.625092.07590.600161.587
3 3/4" - 6 UNR3.750095.25091.20064.233
3 3/4" - 8 UNR3.750095.25092.20083.175
3 3/4" - 12 UNR3.750095.25093.250122.117
3 3/4" - 16 UNR3.750095.25093.750161.587
3 7/8" - 6 UNR3.875098.42594.50064.233
3 7/8" - 8 UNR3.875098.42595.40083.175
3 7/8" - 12 UNR3.875098.42596.400122.117
3 7/8" - 16 UNR3.875098.42596.900161.587
4" - 6 UNR4.0000101.60097.60064.233
4" - 8 UNR4.0000101.60098.60083.175
4" - 12 UNR4.0000101.60099.600122.117
4" - 16 UNR4.0000101.600100.100161.587
4 1/8" - 6 UNR4.1250104.775100.75064.233
4 1/8" - 12 UNR4.1250104.775102.750122.117
4 1/8" - 16 UNR4.1250104.775103.250161.587
4 1/4" - 4 UNR4.2500107.950101.90041.587
4 1/4" - 6 UNR4.2500107.950103.90064.233
4 1/4" - 12 UNR4.2500107.950106.000122.117
4 1/4" - 16 UNR4.2500107.950106.450161.587
4 3/8" - 6 UNR4.3750107.950107.00064.233
4 3/8" - 12 UNR4.3750107.950109.100122.117
4 3/8" - 16 UNR4.3750107.950109.600161.587
4 1/2" - 4 UNR4.5000114.300108.30046.350
4 1/2" - 6 UNR4.5000114.300110.20064.233
4 1/2" - 12 UNR4.5000114.300112.300122.117
4 1/2" - 16 UNR4.5000114.300112.800161.587
4 5/8" - 6 UNR4.6250117.475113.50064.233
4 5/8" - 12 UNR4.6250117.475115.500122.117
4 5/8" - 16 UNR4.6250117.475116.000161.587
4 3/4" - 4 UNR4.7500120.650114.75046.350
4 3/4" - 6 UNR4.7500120.650116.60064.233
4 3/4" - 12 UNR4.7500120.650118.600122.117
4 3/4" - 16 UNR4.7500120.650119.150161.587
4 7/8" - 6 UNR4.8750123.825119.80064.233
4 7/8" - 12 UNR4.8750123.825121.800122.117
4 7/8" - 16 UNR4.8750123.825122.350161.587
5" - 4 UNR6.0000127.000121.0046.350
5" - 6 UNR5.0000127.000123.00064.233
5" - 12 UNR5.0000127.000125.000122.117
5" - 16 UNR5.0000127.000125.500161.587
5 1/8" - 12 UNR5.1250130.175128.200122.117
5 1/8" - 16 UNR5.1250130.175128.700161.587
5 1/4" - 4 UNR5.1250133.350127.30046.350
5 1/4" - 12 UNR5.2500133.350131.350122.117
5 1/4" - 16 UNR5.2500133.350131.850161.587
5 3/8" - 12 UNR5.3750136.525134.500122.117
5 3/8" - 16 UNR5.3750136.525135.000161.587
5 1/2" - 4 UNR5.5000139.700133.75042.117
5 1/2" - 12 UNR5.5000139.700137.700122.540
5 1/2" - 16 UNR5.5000139.700138.200161.587
5 5/8" - 12 UNR5.6250142.875140.850122.117
5 5/8" - 16 UNR5.6250142.875141.350161.587
5 3/4" - 4 UNR5.7500146.050140.0046.350
5 3/4" - 12 UNR5.7500146.050144.000122.117
5 3/4" - 16 UNR5.7500146.050144.550161.587
5 7/8" - 12 UNR5.8750149.225147.200122.117
5 7/8" - 16 UNR5.8750149.225147.700161.587
6" - 4 UNR6.0000152.400146.30046.350
6" - 12 UNR6.0000152.400150.400122.117
6" - 16 UNR6.0000152.400150.900161.587
UNR Thread