BS4505 Threaded Flange


All Dimensions in Millimetres

Larger Sizes Available For BS4504 Flanges
Thread to be specified by the customer

PN6 Bar Nominal Pressure (6/4)
NB Size
Inch. MM A B C D F G H J R No. holes
1/2" 15 80.00 55.00 40.00 30.00 20.00 12.00 2.00 11.00 3.00 4
3/4" 20 90.00 65.00 50.00 40.00 24.00 14.00 2.00 11.00 4.00 4
1" 25 100.00 75.00 60.00 50.00 24.00 14.00 2.00 11.00 4.00 4
1-1/4" 32 120.00 90.00 70.00 60.00 26.00 14.00 2.00 14.00 5.00 4
1-1/2" 40 130.00 100.00 80.00 70.00 26.00 14.00 3.00 14.00 5.00 4
2" 50 140.00 110.00 90.00 80.00 28.00 14.00 3.00 14.00 5.00 4
2-1/2" 65 160.00 130.00 110.00 100.00 32.00 14.00 3.00 14.00 6.00 4
3" 80 190.00 150.00 128.00 110.00 34.00 16.00 3.00 18.00 6.00 4
4" 100 210.00 170.00 148.00 130.00 40.00 16.00 3.00 18.00 6.00 4
PN16 Bar Nominal Pressure (16/4)
NB Size
Inch. MM A B C D F G H J R No. holes
1/2" 15 95.00 65.00 45.00 35.00 20.00 14.00 2.00 14.00 3.00 4
3/4" 20 105.00 75.00 58.00 45.00 24.00 16.00 2.00 14.00 4.00 4
1" 25 115.00 85.00 68.00 52.00 24.00 16.00 2.00 14.00 4.00 4
1-1/4" 32 140.00 100.00 78.00 60.00 26.00 16.00 2.00 18.00 5.00 4
1-1/2" 40 150.00 110.00 88.00 70.00 26.00 16.00 3.00 18.00 5.00 4
2" 50 165.00 125.00 102.00 84.00 28.00 18.00 3.00 18.00 5.00 4
2-1/2" 65 185.00 145.00 122.00 104.00 32.00 18.00 3.00 18.00 6.00 4
3" 80 200.00 160.00 138.00 118.00 34.00 20.00 3.00 18.00 6.00 8
4" 100 220.00 180.00 158.00 140.00 40.00 20.00 3.00 18.00 6.00 8
PN40 Bar Nominal Pressure (40/4)
NB Size
Inch. MM A B C D F G H J R No. holes
1/2" 15 95.00 65.00 45.00 35.00 22.00 16.00 2.00 14.00 3.00 4
3/4" 20 105.00 75.00 58.00 45.00 26.00 18.00 2.00 14.00 4.00 4
1" 25 115.00 85.00 68.00 52.00 28.00 18.00 2.00 14.00 4.00 4
1-1/4" 32 140.00 100.00 78.00 60.00 30.00 18.00 2.00 18.00 5.00 4
1-1/2" 40 150.00 110.00 88.00 70.00 32.00 18.00 3.00 18.00 5.00 4
2" 50 165.00 125.00 102.00 84.00 34.00 20.00 3.00 18.00 5.00 4
2-1/2" 65 185.00 145.00 122.00 104.00 38.00 22.00 3.00 18.00 6.00 8
3" 80 200.00 160.00 138.00 118.00 40.00 24.00 3.00 18.00 6.00 8
4" 100 235.00 190.00 162.00 145.00 44.00 24.00 3.00 22.00 6.00 8

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