ANSI B16.5 Socket Weld Flange


All Dimensions in Millimetres

Class 150 Flanges
NB Size
Inch. MM A B C D E F G H J k No. holes
1/2" 15 89.00 60.30 35.00 30.00 22.40 16.00 11.10 1.60 15.90 9.50 4
3/4" 20 98.00 69.80 43.00 38.00 27.70 16.00 12.70 1.60 15.90 11.00 4
1" 25 108.00 79.40 51.00 49.00 34.50 17.00 14.30 1.60 15.90 12.50 4
1-1/4" 32 117.00 88.90 64.00 59.00 43.20 21.00 15.90 1.60 15.90 14.50 4
1-1/2" 40 127.00 98.40 73.00 65.00 49.50 22.00 17.50 1.60 15.90 16.00 4
2" 50 152.00 120.60 92.00 78.00 62.00 25.00 19.00 1.60 19.00 17.50 4
2-1/2" 65 178.00 139.70 105.00 90.00 74.70 29.00 22.20 1.60 19.00 19.00 4
3" 80 190.00 152.40 127.00 108.00 90.70 30.00 23.80 1.60 19.00 20.50 4
Class 150 Flanges
NB Size
Inch. MM A B C D E F G H J k No. holes
1/2" 15 89.00 60.30 35.00 30.00 22.40 16.00 11.10 1.60 15.90 9.50 4
3/4" 20 98.00 69.80 43.00 38.00 27.70 16.00 12.70 1.60 15.90 11.00 4
1" 25 108.00 79.40 51.00 49.00 34.50 17.00 14.30 1.60 15.90 12.50 4
1-1/4" 32 117.00 88.90 64.00 59.00 43.20 21.00 15.90 1.60 15.90 14.50 4
1-1/2" 40 127.00 98.40 73.00 65.00 49.50 22.00 17.50 1.60 15.90 16.00 4
2" 50 152.00 120.60 92.00 78.00 62.00 25.00 19.00 1.60 19.00 17.50 4
2-1/2" 65 178.00 139.70 105.00 90.00 74.70 29.00 22.20 1.60 19.00 19.00 4
3" 80 190.00 152.40 127.00 108.00 90.70 30.00 23.80 1.60 19.00 20.50 4
Class 300 Flanges
NB Size
Inch. MM A B C D E F G H J k No. holes
1/2" 15 95.00 66.70 35.00 38.00 22.40 22.00 14.30 1.60 15.90 9.50 4
3/4" 20 117.00 82.60 43.00 48.00 27.70 25.00 15.90 1.60 19.00 11.00 4
1" 25 124.00 88.90 51.00 54.00 34.50 27.00 17.50 1.60 19.00 12.50 4
1-1/4" 32 133.00 98.40 64.00 64.00 43.20 27.00 19.00 1.60 19.00 14.50 4
1-1/2" 40 156.00 114.30 73.00 70.00 49.50 30.00 20.60 1.60 22.20 16.00 4
2" 50 165.00 127.00 92.00 84.00 62.00 33.00 22.20 1.60 19.00 17.50 8
2-1/2" 65 190.00 149.20 105.00 100.00 74.70 38.00 25.40 1.60 22.20 19.00 8
3" 80 210.00 168.30 127.00 117.00 90.70 43.00 28.60 1.60 22.20 20.50 8
Class 600 Flanges
NB Size
Inch. MM A B C D E F G H J k No. holes
1/2" 15 95.00 66.70 35.00 38.00 22.40 22.00 20.70 6.40 15.90 9.50 4
3/4" 20 117.00 82.60 43.00 48.00 27.70 25.00 22.30 6.40 19.00 11.00 4
1" 25 124.00 88.90 51.00 54.00 34.50 27.00 23.90 6.40 19.00 12.50 4
1-1/4" 32 133.00 98.40 64.00 64.00 43.20 29.00 27.00 6.40 19.00 14.50 4
1-1/2" 40 156.00 114.30 73.00 70.00 49.50 32.00 28.80 6.40 22.20 16.00 4
2" 50 165.00 127.00 92.00 84.00 62.00 37.00 31.80 6.40 19.00 17.50 8
2-1/2" 65 190.00 149.20 105.00 100.00 74.70 41.00 35.00 6.40 22.20 19.00 8
3" 80 210.00 168.30 127.00 117.00 90.70 46.00 38.20 6.40 22.20 20.50 8
Class 900 Flanges
NB Size
Inch. MM A B C D E F G H J k No. holes
1/2" 15 121.00 82.60 35.00 38.00 22.40 32.00 22.20 6.40 22.20 9.50 4
3/4" 20 130.00 88.90 43.00 44.00 27.70 35.00 25.40 6.40 22.20 11.00 4
1" 25 149.00 101.60 51.00 52.00 34.50 41.00 28.60 6.40 25.40 12.50 4
1-1/4" 32 159.00 111.10 64.00 64.00 43.20 41.00 28.60 6.40 25.40 14.50 4
1-1/2" 40 178.00 123.80 73.00 70.00 49.50 44.00 31.80 6.40 28.60 16.00 4
2" 50 216.00 165.10 92.00 105.00 62.00 57.00 38.10 6.40 25.40 17.50 8
2-1/2" 65 244.00 190.50 105.00 124.00 74.70 64.00 41.30 6.40 28.60 19.00 8
Class 1500 Flanges
NB Size
Inch. MM A B C D E F G H J k No. holes
1/2" 15 121.00 82.60 35.00 38.00 22.40 32.00 22.20 6.40 22.20 9.50 4
3/4" 20 130.00 88.90 43.00 44.00 27.70 35.00 25.40 6.40 22.20 11.00 4
1" 25 149.00 101.60 51.00 52.00 34.50 41.00 28.60 6.40 25.40 12.50 4
1-1/4" 32 159.00 111.10 64.00 64.00 43.20 41.00 28.60 6.40 25.40 14.50 4
1-1/2" 40 178.00 123.80 73.00 70.00 49.50 44.00 31.80 6.40 28.60 16.00 4
2" 50 216.00 165.10 92.00 105.00 62.00 57.00 38.10 6.40 25.40 17.50 8
2-1/2" 65 244.00 190.50 105.00 124.00 74.70 64.00 41.30 6.40 28.60 19.00 8

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