BS4505 Weld Neck Flange

All Dimensions in Millimetres
Larger Sizes Available For BS4504 Flanges
PN6 Bar Nominal Pressure (6/2)
NB Size
Inch. MM A B C D E F G H J R No. holes
1/2" 15 80.00 55.00 40.00 30.00 21.30 30.00 12.00 2.00 11.00 3.00 4
3/4" 20 90.00 65.00 50.00 38.00 26.90 32.00 14.00 2.00 11.00 4.00 4
1" 25 100.00 75.00 60.00 42.00 33.70 35.00 14.00 2.00 11.00 4.00 4
1-1/4" 32 120.00 90.00 70.00 55.00 42.40 35.00 14.00 2.00 14.00 5.00 4
1-1/2" 40 130.00 100.00 80.00 62.00 48.30 38.00 14.00 3.00 14.00 5.00 4
2" 50 140.00 110.00 90.00 74.00 60.30 38.00 14.00 3.00 14.00 5.00 4
2-1/2" 65 160.00 130.00 110.00 88.00 76.10 38.00 14.00 3.00 14.00 6.00 4
3" 80 190.00 150.00 128.00 102.00 88.90 42.00 16.00 3.00 18.00 6.00 4
4" 100 210.00 170.00 148.00 130.00 114.30 45.00 16.00 3.00 18.00 6.00 4
PN10 Bar Nominal Pressure (10/2) & PN16 Bar Nominal Pressure (16/2)
NB Size
Inch. MM A B C D E F G H J R No. holes
1/2" 15 95.00 65.00 45.00 32.00 21.30 35.00 14.00 2.00 14.00 3.00 4
3/4" 20 105.00 75.00 58.00 39.00 26.90 38.00 16.00 2.00 14.00 4.00 4
1" 25 115.00 85.00 68.00 46.00 33.70 38.00 16.00 2.00 14.00 4.00 4
1-1/4" 32 140.00 100.00 78.00 56.00 42.40 40.00 16.00 2.00 18.00 5.00 4
1-1/2" 40 150.00 110.00 88.00 64.00 48.30 42.00 16.00 3.00 18.00 5.00 4
2" 50 165.00 125.00 102.00 74.00 60.30 45.00 18.00 3.00 18.00 5.00 4
2-1/2" 65 185.00 145.00 122.00 92.00 76.10 45.00 18.00 3.00 18.00 6.00 4
3" 80 200.00 160.00 138.00 110.00 88.90 50.00 20.00 3.00 18.00 6.00 8
4" 100 220.00 180.00 158.00 130.00 114.30 52.00 20.00 3.00 18.00 6.00 8
PN25 Bar Nominal Pressure (25/2) & PN40 Bar Nominal Pressure (40/2)
NB Size
Inch. MM A B C D E F G H J R No. holes
1/2" 15 95.00 65.00 45.00 32.00 21.30 38.00 16.00 2.00 14.00 3.00 4
3/4" 20 105.00 75.00 58.00 40.00 26.90 40.00 18.00 2.00 14.00 4.00 4
1" 25 115.00 85.00 68.00 46.00 33.70 40.00 18.00 2.00 14.00 4.00 4
1-1/4" 32 140.00 100.00 78.00 56.00 42.40 42.00 18.00 2.00 18.00 5.00 4
1-1/2" 40 150.00 110.00 88.00 64.00 48.30 45.00 18.00 3.00 18.00 5.00 4
2" 50 165.00 125.00 102.00 74.00 60.30 48.00 20.00 3.00 18.00 5.00 4
2-1/2" 65 185.00 145.00 122.00 92.00 76.10 52.00 22.00 3.00 18.00 6.00 8
3" 80 200.00 160.00 138.00 110.00 88.90 58.00 24.00 3.00 18.00 6.00 8
4" 100 235.00 190.00 162.00 134.00 114.30 65.00 24.00 3.00 22.00 6.00 8

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