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Dimensions of the steel Flanges DN 450 - 18"
n° - number of holes
dia - diameter of bolts
| Flange standard |
PN
Rating |
D |
K |
L |
n° |
dia |
c |
d |
f |
UNI 2223
DIN 2501
BS 4504
NF E 29-203*
ISO/DIS 7005-1.2* |
2,5-6 |
595 |
550 |
22 |
16 |
M20 |
28 |
520 |
4 |
| 10 |
615 |
565 |
26 |
20 |
M24 |
28 |
532 |
4 |
| 16 |
640 |
585 |
30 |
20 |
M27 |
36 |
550 |
4 |
| 25 |
670 |
600 |
36 |
20 |
M33 |
42 |
550 |
4 |
| 40 |
685 |
610 |
39 |
20 |
M36 |
50 |
560 |
4 |
| 64 |
715 |
630 |
42 |
20 |
M39 |
64 |
535
|
4 |
| 100 |
770 |
675 |
48 |
20 |
M45 |
84 |
535
|
4
|
ISO/DIS 7005-1.2
NF E 29-203 |
20 |
635 |
578,0 |
32,5 |
16 |
M30 |
40,0 |
533,5 |
2 |
| 50 |
710 |
628,5
|
35,5 |
24 |
M33 |
60,5 |
533,5 |
2 |
| 100 |
745 |
654,0 |
45,0 |
20 |
M42 |
83,0 |
533,5 |
7** |
ANSI B 16.5
BS 1560 |
150 |
25,00
(635,0) |
22,75
(577,8) |
1,25
(31,7) |
16 |
1,12
(28,6) |
1,56
(39,7) |
21,00
(533,4) |
0,06
(1.6) |
| 300 |
28,00
(711,2) |
24,75
(628,6)
|
1,38
(34,9) |
24 |
1,25
(31,8) |
2,38
(60,3) |
21,00
(533,4) |
0,06
(1,6) |
| 400 |
28,00
(711,2) |
24,75
(628,6) |
1,50
(38,1) |
24 |
1,38
(34,9) |
2,62
(66,7)
|
21,00
(533,4) |
0,25**
(6,4) |
| 600 |
29,25
(742,9) |
25,75
(654,0) |
1,75
(44,4)
|
20 |
1,62
(41,3) |
3,25
(82,5) |
21,00
(533,4) |
0,25**
(6,4) |
| 900 |
31,00
(787,4) |
27,00
(586,8) |
2,00
(50,8) |
20 |
1,88
(47,6)
|
4,00
(101,6)
|
21,00
(533,4) |
0,25**
(6,4) |
BS 10
AS 2129 |
A |
25¼
(641,4) |
23
(584,2) |
1
(25,4) |
12 |
⅞
(22,2) |
⅞
(22,2) |
— |
— |
| D |
25¼
(641,4) |
23
(584,2) |
1
(25,4) |
12 |
⅞
(22,2) |
1⅛
(28,6) |
— |
— |
| E |
25¼
(641,4) |
23
(584,2) |
1
(25,4) |
16 |
⅞
(22,2) |
1⅛
(28,6) |
— |
— |
| F |
26½
(673,1)
|
24
(609,6) |
1¼
(31,8) |
20 |
1⅛
(28,6) |
1⅜
(34,9) |
— |
— |
| H |
26½
(673,1) |
24
(609,6) |
1¼
(31,8) |
20 |
1⅛
(28,6) |
1⅞
(47,6) |
21
(533,4) |
1/16
(1.6) |
| J |
26½
(673,1) |
24
(609,6) |
1⅜
(34,9) |
20 |
1¼
(31,8) |
2⅜
(60,3)
|
21
(533,4) |
1/16
(1.6) |
Note - The dimensions of ANSI - BS -AS flanges are in inch; the others are in mm (the ones in brackets included which are derived from the dimensions in inch)* For ratings 2,5-6-10-16-25-40 only** To be added to the thickness C of the flange
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Reference Manual 
