BLIND FLANGES ASME B16.5 Class 400

Nominal
Size
NPS
Outside
Diameter
of
Flange
Thickness
of
Flange
Diameter Of Raised
Face (1)
Number of
Bolt Holes
Diameter
of
Bolt
Holes
Diameter
of
Bolts
Diameter
of
Bolt
Circle
Approx.
Weight

Pounds
Kg

O C R
½
¾
1 Sizes ½ thru 3 ½ are identical to Class 600
1 ¼
1 ½
2
2 ½
3
3 ½
4 in. 10 1.38 6.19 8 1  7/8 7.88 33
mm 254 35.1 157.2 25.4 22.2 200.2 15
5 in. 11 1.5 7.31 8 1  7/8 9.25 44
mm 279.4 38.1 185.7 25.4 22.2 235 20
6 in. 12.5 1.62 8.5 12 1  7/8 10.62 61
mm 317.5 41.1 215.9 25.4 22.2 269.7 28
8 in. 15 1.88 10.62 12 1.12 1 13 100
mm 381 47.8 269.7 28.4 25.4 330.2 45
10 in. 17.5 2.12 12.75 16 1.25 1 1/8 15.25 155
mm 444.5 53.8 323.9 31.8 28.6 387.4 70
12 in. 20.5 2.25 15 16 1.38 1 ¼ 17.75 225
mm 520.7 57.2 381 35.1 31.8 450.9 102
14 in. 23 2.38 16.25 20 1.38 1 ¼ 20.25 290
mm 584.2 60.5 412.8 35.1 31.8 514.4 132
16 in. 25.5 2.5 18.5 20 1.5 1 3/8 22.5 370
mm 647.7 63.5 469.9 38.1 34.9 571.5 168
18 in. 28 2.62 21 24 1.5 1 3/8 24.75 455
mm 711.2 66.5 533.4 38.1 34.9 628.7 206
20 in. 30.5 2.75 23 24 1.62 1 ½ 27 587
mm 774.7 69.9 584.2 41.1 38.1 685.8 266
24 in. 36 3 27.25 24 1.88 1 ¾ 32 890
mm 914.4 76.2 692.2 47.8 44.5 812.8 404