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Flange - Pipe Index

BS4504 PN 25 Dimensions

Note: Now obsolete and replaced by BS EN 1092-1 see flange index page.

DN = Nominal size, D = Outside Diameter, A = Outside Dia of Neck , B1 = Bore of Type 101 & 112 Flange, C1 = Thickness of Plate Flange,
C2 = Thickness of Weld_Neck and Boss Flange , N1 = Dia of Weld Neck ,N2 = Dia of Boss , R = corner Radius, H1 = Length of Boss Flange,
H2 = Length of Weld Neck Flange, H3 = Length of Neck :

Note: The flanges shown are only a small part of the range covered in BS 4504.

The Facings shown are type B (Raised Face).  Other Facings include:
Type A..Flat:  Type C..Tongue:   Type D..Groove   Type E..Spigot:  :Type F..Recess:   Type G..O-ring Recess:  Type H.,0-ring Groove:

Note : All Dimensions in mm

DN D C1 C2 H1 H2 H3 R A N1 N2 B1 d1 f1
10 90 14 16 22 35 6 3 17,2 28 30 18 40 2
15 95 14 16 22 38 6 3 21,3 32 35 22 45 2
20 105 16 18 26 40 6 4 26,9 40 45 27,5 58 2
25 115 16 18 28 40 6 4 33,7 46 52 34,5 68 2
32 140 18 18 30 42 6 5 42,4 56 60 43,5 78 2
40 150 18 18 32 45 7 5 48,3 64 70 49,5 88 3
50 165 20 20 34 48 8 5 60,3 74 84 61,5 102 3
65 185 22 22 38 52 10 6 76,1 92 104 77,5 122 3
80 200 24 24 40 58 12 6 88,9 110 118 90,5 138 3
100 235 26 24 44 65 12 6 114,3 134 145 116 162 3
125 270 28 26 48 68 12 6 139,7 162 170 141,5 188 3
150 300 30 28 52 75 12 8 168,3 190 200 170,5 218 3
200 360 32 30 52 80 16 8 219,1 244 256 221,5 278 3
250 425 35 32 60 88 18 10 273,0 296 310 276,5 335 3
300 485 38 34 67 92 18 10 323,9 350 364 327,5 395 4
350 555 42 38 72 100 20 10 355,6 398 418 359,5 450 4
400 620 46 40 78 110 20 10 406,4 452 472 411,0 505 4
450 670 50 42 84 110 20 12 457,0 500 520 462,0 555 4
500 730 56 44 90 125 20 12 508,0 558 580 513,5 615 4
600 845 68 46 100 125 20 12 610,0 660 684 616,5 720 5
700 960 - 46   125 20 12 711,0 760     820 5
800 1085 - 50   135 22 12 813,0 864   - 930 5
900 1185 - 54   145 24 12 914,0 968   - 1030 5
1000 1320 - 58   155 24 12 1016,0 1070   - 1140 5
1200 1530 - - -     12 1220,0   - - 1350 5
1400 1755 - - -     12 1420,0   - - 1560 5
1600 1975 - - -     12 1620,0   - - 1780 5
DN D C1 C2 H1 H2 H3 R A N1 N2 B1 d1 f1

Flange Bolting

K = Bolt Circle Diameter, L = Dia Of Bolt Hole,
No = Number of Holes , Size = Size of Bolts

DN K L No Size
mm mm mm - mm
10 60 14 4 M12
15 65 14 4 M12
20 75 14 4 M12
25 85 14 4 M12
32 100 18 4 M16
40 110 18 4 M16
50 125 18 4 M16
65 145 18 8 M16
80 160 18 8 M16
100 190 22 8 M20
125 220 26 8 M24
150 250 26 8 M24
200 310 26 12 M24
250 370 30 12 M27
300 430 30 16 M27
350 490 33 16 M30
400 550 36 16 M33
450 600 36 20 M33
500 660 36 20 M33
600 770 39 20 M36
700 875 42 24 M39
800 990 48 24 M45
900 1090 48 28 M45
1000 1210 56 28 M52
1200 1420 56 32 M52
1400 1640 62 36 M56
1600 1860 62 40 M56
DN K L No Size

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Last Updated 23/01/2013