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Steel Flange Index

BS4504 PN 40 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
200 375 36 34 52 88 16 8 219,1 244 260 221,5 285 3
250 450 42 38 60 105 18 10 273 306 312 276,5 345 3
300 515 48 42 67 115 18 10 323,9 362 380 327,5 410 4
350 580 54 46 72 125 20 10 355,6 408 424 359,5 465 4
400 660 60 50 78 135 20 10 406,4 462 478 411,0 535 4
450 685 66 50 84 135 20 12 457,0 500 522 462,0 560 4
500 755 72 52 90 140 20 12 508,0 562 576 513,5 615 4
600 890 84 60 100 150 20 12 610,0 666 686 616,5 735 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
200 320 30 12 M27
250 385 33 12 M30
300 450 33 16 M30
350 510 36 16 M33
400 585 39 16 M36
450 610 39 20 M36
500 670 42 20 M39
600 795 48 20 M45

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Last Updated 23/01/2013