UNS Thread ASME B1.1-2003

UNS - Unified Special Thread Series, which is used for special purposes.
The thread angle is 60°.

Nominal
Diameter		 Major
Diameter
Inch		 Major
Diameter
mm		 Tapping
Drill Size
mm		 TPI Pitch
mm
10 - 28 UNS 0.1900 4.826 3.95 28 0.907
10 - 36 UNS 0.1900 4.826 4.15 36 0.706
10 - 40 UNS 0.1900 4.826 4.20 40 0.635
10 - 48 UNS 0.1900 4.826 4.35 48 0.529
10 - 56 UNS 0.1900 4.826 4.39 56 0.454
12 - 36 UNS 0.2160 5.486 4.80 36 0.706
12 - 40 UNS 0.2160 5.486 4.90 40 0.635
12 - 48 UNS 0.2160 5.486 4.98 48 0.529
12 - 56 UNS 0.2160 5.486 5.05 56 0.454
1/4" - 24 UNS 0.2500 6.350 5.35 24 1.058
1/4" - 27 UNS 0.2500 6.350 5.45 27 0.941
1/4" - 36 UNS 0.2500 6.350 5.70 36 0.706
1/4" - 40 UNS 0.2500 6.350 5.75 40 0.635
1/4" - 48 UNS 0.2500 6.350 5.85 48 0.529
1/4" - 56 UNS 0.2500 6.350 5.95 56 0.454
5/16" - 27 UNS 0.3125 7.938 7.10 27 0.941
5/16" - 36 UNS 0.3125 7.938 7.25 36 0.706
5/16" - 40 UNS 0.3125 7.938 7.40 40 0.635
5/16" - 48 UNS 0.3125 7.938 7.50 48 0.529
3/8" - 18 UNS 0.3750 9.525 8.20 18 1.411
3/8" - 27 UNS 0.3750 9.525 8.70 27 0.941
3/8" - 36 UNS 0.3750 9.525 8.90 36 0.706
3/8" - 40 UNS 0.3750 9.525 9.00 40 0.635
0,390" - 27 UNS 0.3900 9.906 9.00 27 0.941
7/16" - 18 UNS 0.4375 11.112 9.75 18 1.411
7/16" - 24 UNS 0.4375 11.112 10.10 24 1.058
7/16" - 27 UNS 0.4375 11.112 10.20 27 0.941
1/2" - 12 UNS 0.5000 12.700 10.75 12 2.117
1/2" - 14 UNS 0.5000 12.700 11.00 14 1.814
1/2" - 18 UNS 0.5000 12.700 11.40 18 1.411
1/2" - 24 UNS 0.5000 12.700 11.70 24 1.058
1/2" - 27 UNS 0.5000 12.700 11.85 27 0.941
9/16" - 14 UNS 0.5625 14.288 12.60 14 1.814
9/16" - 27 UNS 0.5625 14.288 13.40 27 0.941
5/8" - 14 UNS 0.6250 15.875 14.20 14 1.814
5/8" - 27 UNS 0.6250 15.875 15.00 27 0.941
3/4" - 14 UNS 0.7500 19.050 17.40 14 1.814
3/4" - 18 UNS 0.7500 19.050 17.75 18 1.411
3/4" - 24 UNS 0.7500 19.050 18.10 24 1.058
3/4" - 27 UNS 0.7500 19.050 18.20 27 0.941
7/8" - 10 UNS 0.8750 22.225 19.75 10 2.540
7/8" - 18 UNS 0.8750 22.225 21.00 18 1.411
7/8" - 24 UNS 0.8750 22.225 21.20 24 1.058
7/8" - 27 UNS 0.8750 22.225 21.40 27 0.941
1" - 10 UNS 1.0000 25.400 23.00 10 2.540
1" - 14 UNS 1.0000 25.400 23.75 14 1.814
1" - 18 UNS 1.0000 25.400 24.25 18 1.411
1" - 24 UNS 1.0000 25.400 24.50 24 1.058
1" - 27 UNS 1.0000 25.400 24.50 27 0.941
1 1/8" - 10 UNS 1.1250 28.575 26.25 10 2.540
1 1/8" - 14 UNS 1.1250 28.575 27.00 14 1.814
1 1/8" - 24 UNS 1.1250 28.575 27.75 24 1.058
1 1/4" - 10 UNS 1.2500 31.750 29.50 10 2.540
1 1/4" - 14 UNS 1.2500 31.750 30.00 14 1.814
1 1/4" - 24 UNS 1.2500 31.750 30.75 24 1.058
1 3/8" - 10 UNS 1.3750 34.925 32.60 10 2.540
1 3/8" - 14 UNS 1.3750 34.925 33.30 14 1.814
1 1/2" - 10 UNS 1.5000 38.100 35.70 10 2.540
1 1/2" - 14 UNS 1.5000 38.100 36.50 14 1.814
1 1/2" - 24 UNS 1.5000 38.100 37.30 24 1.058
1 5/8" - 10 UNS 1.6250 41.275 39.00 10 2.540
1 5/8" - 14 UNS 1.6250 41.275 39.50 14 1.814
1 5/8" - 24 UNS 1.6250 41.275 40.35 24 1.058
1 3/4" - 10 UNS 1.7500 44.450 42.00 10 2.540
1 3/4" - 14 UNS 1.7500 44.450 42.85 14 1.814
1 3/4" - 18 UNS 1.7500 44.450 43.25 18 1.411
1 7/8" - 10 UNS 1.8750 47.625 45.30 10 2.540
1 7/8" - 14 UNS 1.8750 47.625 46.00 14 1.814
1 7/8" - 18 UNS 1.8750 47.625 46.35 18 1.411
2" - 10 UNS 2.0000 50.800 48.40 10 2.540
2" - 14 UNS 2.0000 50.800 49.25 14 1.814
2" - 18 UNS 2.0000 50.800 49.50 18 1.411
2 1/16" - 16 UNS 2.0625 52.387 51.00 16 1.587
2 3/16" - 16 UNS 2.1875 55.563 54.10 16 1.587
2 1/4" - 10 UNS 2.2500 57.150 54.75 10 2.540
2 1/4" - 14 UNS 2.2500 57.150 55.50 14 1.814
2 1/4" - 18 UNS 2.2500 57.150 55.75 18 1.411
2 5/16" - 16 UNS 2.3125 58.737 57.30 16 1.587
2 7/16" - 16 UNS 2.4375 61.912 60.50 16 1.587
2 1/2" - 10 UNS 2.5000 63.500 61.20 10 2.540
2 1/2" - 14 UNS 2.5000 63.500 61.75 14 1.814
2 1/2" - 18 UNS 2.5000 63.500 62.30 18 1.411
2 3/4" - 10 UNS 2.7500 69.850 67.50 10 2.540
2 3/4" - 14 UNS 2.7500 69.850 68.25 14 1.814
2 3/4" - 18 UNS 2.7500 69.850 68.50 18 1.411
3" - 10 UNS 3.0000 76.200 73.80 10 2.540
3" - 14 UNS 3.0000 76.200 74.50 14 1.814
3" - 18 UNS 3.0000 76.200 75.00 18 1.411
3 1/4" - 10 UNS 3.2500 82.550 80.25 10 2.540
3 1/4" - 14 UNS 3.2500 82.550 81.00 14 1.814
3 1/4" - 18 UNS 3.2500 82.550 81.25 18 1.411
3 1/2" - 10 UNS 3.5000 88.900 86.55 10 2.540
3 1/2" - 14 UNS 3.5000 88.900 87.25 14 1.814
3 1/2" - 18 UNS 3.5000 88.900 87.60 18 1.411
3 3/4" - 10 UNS 3.7500 95.250 93.00 10 2.540
3 3/4" - 14 UNS 3.7500 95.250 93.60 14 1.814
3 3/4" - 18 UNS 3.7500 95.250 94.00 18 1.411
4" - 10 UNS 4.0000 101.600 99.30 10 2.540
4" - 14 UNS 4.0000 101.600 100.00 14 1.814
4 1/4" - 10 UNS 3.2500 107.950 105.60 10 2.540
4 1/4" - 14 UNS 4.2500 107.950 106.30 14 1.814
4 1/2" - 10 UNS 4.5000 114.300 112.00 10 2.540
4 1/2" - 14 UNS 4.5000 114.300 112.65 14 1.814
4 3/4" - 10 UNS 4.7500 120.650 118.35 10 2.540
4 3/4" - 14 UNS 4.7500 120.650 119.00 14 1.814
5" - 10 UNS 5.0000 127.000 124.70 10 2.540
5" - 14 UNS 5.0000 127.000 125.35 14 1.814
5 1/4" - 10 UNS 5.2500 133.350 131.00 10 2.540
5 1/4" - 14 UNS 5.2500 133.350 131.70 14 1.814
5 1/2" - 10 UNS 5.5000 139.700 137.40 10 2.540
5 1/2" - 14 UNS 5.5000 139.700 138.00 14 1.814
5 3/4" - 10 UNS 5.7500 146.050 143.75 10 2.540
5 3/4" - 14 UNS 5.7500 146.050 144.40 14 1.814
6" - 10 UNS 6.0000 152.400 150.00 10 2.540
6" - 14 UNS 6.0000 152.400 150.75 14 1.814

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