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Flange - Pipe Index

BS4504 PN 16 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 14 20 35 6 3 17,2 28 30 18 40 2
15 95 14 14 20 35 6 3 21,3 32 35 22 45 2
20 105 14 14 24 38 6 4 26,9 39 45 27,5 58 2
25 115 16 16 24 38 6 4 33,7 46 52 34,5 68 2
32 140 18 16 26 40 6 5 42,4 56 60 43,5 78 2
40 150 18 16 26 42 7 5 48,3 64 70 49,5 88 3
50 165 20 18 28 45 8 5 60,3 74 84 61,5 102 3
65 185 20 18 32 45 10 6 76,1 92 104 77,5 122 3
80 200 20 20 34 50 10 6 88,9 110 118 90,5 138 3
100 220 22 20 40 52 12 6 114,3 130 140 116 162 3
125 250 22 22 44 55 12 6 139,7 158 168 141,5 188 3
150 285 24 22 44 55 12 8 168,3 184 195 170,5 212 3
200 340 26 24 44 62 16 8 219,1 234 246 221,5 268 3
250 405 29 26 46 70 16 10 273 288 298 276,5 320 3
300 460 32 28 46 78 16 10 323,9 342 350 327,5 378 4
350 520 35 30 57 82 16 10 355,6 390 400 359 438 4
400 580 38 32 63 85 16 10 406,4 444 456 411,0 490 4
450 640 42 34 68 87 16 12 457,0 490 502 462,0 550 4
500 715 46 34 73 90 16 12 508,0 546 559 513,5 610 4
600 840 52 36 83 95 18 12 610,0 650 658 616,5 725 5
700 910 60 36 83 100 18 12 711,0 750 760 - 795 5
800 1025 68 38 90 105 20 12 813,0 848 864 - 900 5
900 1125 76 40 94 110 20 12 914,0 948 968 - 1000 5
1000 1255 84 42 100 120 22 12 1016,0 1056 1072 - 1115 5
1200 1485 98 48 - 130 30 12 1220,0 1260 - - 1330 5
1400 1685 - 52 - 145 30 12 1420,0 1465 - - 1530 5
1600 1930 - 58 - 160 35 12 1620,0 1668 - - 1750 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
100 180 18 8 M16
125 210 18 8 M16
150 240 22 8 M20
200 295 22 12 M20
250 355 26 12 M24
300 410 26 12 M24
350 470 26 16 M24
400 525 30 16 M27
450 585 30 20 M27
500 650 33 20 M30
600 770 36 20 M33
700 840 36 24 M33
800 950 39 24 M36
900 1050 39 28 M36
1000 1170 42 28 M39
1200 1390 48 32 M45
1400 1590 48 36 M45
1600 1820 56 40 M52
DN K L No Size

** Subjecxt to agreement between the manufacturer and the purchaser 4 holes can be used for PN16 ,DN65 steel flanges



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Last Updated 23/01/2013