Thomas C. Wilson Tube Tools
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TUBE CLEANING

REFERENCE CHART

Boiler and Condenser Tube Sizes - Millimeters


Thickness of Wall and Birmingham Wire GA and in Millimeters
Tube 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
OD
(Inches)
OD
(mm)
ID .9 1.1 1.2 1.5 1.7 1.8 2.1 2.4 2.8 3.0 3.4 3.8 4.2 4.6 5.2 5.6 6.0 6.6 7.2 7.6 8.6
1/2 12.7 Min. 10.7 10.4 10.0 9.5 9.1 8.7 8.1 7.4 6.6 6.0                      
Nom. 10.9 10.6 10.2 9.8 9.4 9.0 8.5 7.9 7.2 6.6                      
5/8 15.9 Min. 13.9 13.5 13.1 12.6 12.2 11.9 11.3 10.6 9.8 9.2 8.4 7.6 6.7 5.8              
Nom. 14.1 13.7 13.4 12.9 12.6 12.2 11.7 11.0 10.3 9.8 9.1 8.4 7.5 6.7              
3/4 19.1 Min. 17.1 16.7 16.3 15.8 15.4 15.0 14.4 13.8 13.0 12.3 11.6 10.8 9.8 9.0 7.7 6.8 5.7 4.6      
Nom. 17.3 16.9 16.6 16.1 15.7 15.4 14.8 14.2 13.5 13.0 12.2 11.5 10.7 9.9 8.7 7.9 7.0 5.9      
7/8 22.2 Min. 20.2 19.9 19.5 19.0 18.6 18.2 17.6 16.9 16.2 15.5 14.7 13.9 13.0 12.2 10.9 9.9 8.9 7.7      
Nom. 20.4 20.1 19.7 19.3 18.9 18.6 18.0 17.4 16.7 16.1 15.4 14.7 13.8 13.1 11.9 11.0 10.1 9.1      
1 25.4 Min. 23.4 23.1 22.7 22.2 21.8 21.4 20.8 20.1 19.3 18.7 17.9 17.1 16.2 15.3 14.0 13.1 12.1 10.9 9.5 8.6 6.4
Nom. 23.6 23.3 22.9 22.5 22.1 21.7 21.2 20.6 19.9 19.3 18.6 17.9 17.0 16.3 15.1 14.2 13.3 12.2 11.0 10.2 8.1
1-1/8 28.6 Min. 26.6 26.2 25.8 25.3 24.9 24.6 24.0 23.3 22.5 21.9 21.1 20.3 19.4 18.5 17.2 16.3 15.3 14.1 12.7 11.8 9.6
Nom. 26.8 26.4 26.1 25.6 25.3 24.9 24.4 23.7 23.0 22.5 21.8 21.1 20.2 19.4 18.3 17.4 16.5 15.4 14.1 13.3 11.3
1-1/4 31.8 Min. 29.8 29.4 29.0 28.5 28.1 27.7 27.1 26.4 25.7 25.0 24.3 23.5 22.5 21.7 20.4 19.5 18.4 17.3 15.9 15.0 12.8
Nom. 30.0 29.6 29.3 28.8 28.4 28.1 27.5 26.9 26.2 25.7 24.9 24.2 23.4 22.6 21.4 20.6 19.7 18.6 17.3 16.5 14.5
1-3/8 34.9 Min. 32.9 32.6 32.2 31.7 31.3 30.9 30.3 29.6 28.9 28.2 27.5 26.6 25.7 24.9 23.6 22.6 21.6 20.4 19.1 18.2 15.9
Nom. 33.1 32.8 32.4 32.0 31.6 31.3 30.7 30.1 29.4 28.8 28.1 27.4 26.5 25.8 24.6 23.7 22.8 21.8 20.5 19.7 17.7
1-1/2 38.1 Min. 36.1 35.8 35.4 34.8 34.5 34.1 33.5 32.8 32.0 31.4 30.6 29.8 28.9 28.0 26.7 25.8 24.8 23.6 22.2 21.3 19.1
Nom. 36.3 36.2 35.6 35.2 34.8 34.4 33.9 33.3 32.6 32.0 31.3 30.6 29.7 29.0 27.8 26.9 26.0 24.9 23.7 22.9 20.8
1-3/4 44.5 Min. 42.5 42.1 41.7 41.2 40.8 40.4 39.8 39.1 38.4 37.7 37.0 36.2 35.2 34.4 33.1 32.2 31.1 30.0 28.6 27.7 25.5
Nom. 42.7 42.3 42.0 41.5 41.1 40.8 40.2 39.6 38.9 38.4 37.6 36.9 36.1 35.3 34.1 33.3 32.4 31.3 30.0 29.2 27.2
2 50.8 Min. 48.8 48.5 48.1 47.5 47.2 46.8 46.2 45.5 44.7 44.1 43.3 42.5 41.6 40.7 39.4 38.5 37.5 36.3 34.9 34.0 31.8
Nom. 49.0 48.7 48.3 47.9 47.5 47.1 46.6 46.0 45.3 44.7 44.0 43.3 42.4 41.7 40.5 39.6 38.7 37.6 36.4 35.6 33.5
2-1/4 57.2 Min. 55.2 54.8 54.4 53.9 53.5 53.1 52.5 51.8 51.1 50.4 49.7 48.9 47.9 47.1 45.8 44.9 43.8 42.7 41.3 40.4 38.2
Nom. 55.4 55.0 54.7 54.2 53.8 53.5 52.9 52.3 51.6 51.1 50.3 49.6 48.8 48.0 46.8 46.0 45.1 44.0 42.7 41.9 39.9
2-1/2 63.5 Min. 61.5 61.2 60.8 60.2 59.9 59.5 58.9 58.2 57.4 56.8 56.0 55.2 54.3 53.4 52.1 51.2 50.2 49.0 47.6 46.7 44.5
Nom. 61.7 61.4 61.0 60.6 60.2 59.8 59.3 58.7 58.0 57.4 56.7 56.0 55.1 54.4 53.2 52.3 51.4 50.3 49.1 48.3 46.2
2-3/4 69.9 Min. 67.9 67.5 67.1 66.6 66.2 65.8 65.2 64.5 63.8 63.1 62.4 61.6 60.6 59.8 58.5 57.6 56.5 55.4 54.0 53.1 50.9
Nom. 68.1 67.7 67.4 66.9 66.5 66.2 65.6 65.0 64.3 63.8 63.0 62.3 61.5 60.7 59.5 58.7 57.8 56.7 55.4 54.6 52.6
3 76.2 Min. 74.2 73.9 73.5 72.9 72.6 72.2 71.6 70.9 70.1 69.5 68.7 67.9 67.0 66.1 64.8 63.9 62.9 61.7 60.3 59.4 57.2
Nom. 74.4 74.1 73.7 73.3 72.9 72.5 72.0 71.4 70.7 70.1 69.4 68.7 67.8 67.1 65.9 65.0 64.1 63.0 61.8 61.0 58.9
3-1/4 82.6 Min. 80.6 80.2 79.8 79.3 78.9 78.5 77.9 77.2 76.5 75.8 75.1 74.3 73.3 72.5 71.2 70.3 69.2 68.1 66.7 65.8 63.6
Nom. 80.8 80.4 80.1 79.6 79.2 78.9 78.3 77.7 77.0 76.5 75.7 75.0 74.2 73.4 72.2 71.4 70.5 69.4 68.1 67.3 65.3
3-1/2 88.9 Min. 86.9 86.6 86.2 85.6 85.3 84.9 84.3 83.6 82.8 82.2 81.4 80.6 79.7 78.8 77.5 76.6 75.6 74.4 73.0 72.1 69.9
Nom. 87.1 86.8 86.4 86.0 85.6 85.2 84.7 84.1 83.4 82.8 82.1 81.4 80.5 79.8 78.6 77.7 76.8 75.7 74.5 73.7 71.6
3-3/4 95.3 Min. 93.3 92.9 92.5 92.0 91.6 91.2 90.6 89.9 89.2 88.5 87.8 87.0 86.0 85.2 83.9 83.0 81.9 80.8 79.4 78.5 76.3
Nom. 93.5 93.1 92.8 92.3 91.9 91.6 91.0 90.4 89.7 89.2 88.4 87.7 86.9 86.1 84.9 84.1 83.2 82.1 80.8 80.0 78.0
4 101.6 Min. 99.6 99.3 98.9 98.3 98.0 97.6 97.0 96.3 95.5 94.9 94.1 93.3 92.4 91.5 90.2 89.3 88.3 87.1 85.7 84.8 82.6
Nom. 99.8 99.5 99.1 98.7 98.3 97.9 97.4 96.8 96.1 95.5 94.8 94.1 93.2 92.5 91.3 90.4 89.5 88.4 87.2 86.4 84.3
4-1/2 114.3 Min. 112.3 112.0 111.6 111.0 110.7 110.3 109.7 109.0 108.2 107.6 106.8 106.0 105.1 104.2 102.9 102.0 101.0 99.8 98.4 97.5 95.3
Nom. 112.5 112.2 111.8 111.4 111.0 110.6 110.1 109.5 108.8 108.2 107.5 106.8 105.9 105.2 104.0 103.1 102.2 101.1 99.9 99.1 97.0
5 127.0 Min. 125.0 124.7 124.3 123.7 123.4 123.0 122.4 121.7 120.9 120.3 119.5 118.7 117.8 116.9 115.6 114.7 113.7 112.5 111.1 110.2 108.0
Nom. 125.2 124.9 124.5 124.1 123.7 123.3 122.8 122.2 121.5 120.9 120.2 119.5 118.6 117.9 116.7 115.8 114.9 113.8 112.6 111.8 109.7