THREADED FLANGES ASME B16.5 Class 400

Nominal
Size
NPS
Outside
Diameter
of
Flange
Thickness
of
Flange
Diameter Of Raised
Face
Diameter Of Hub At Base (1) Length
thru
Hub
Minimum Threaded Lenght Minimum Counter – Bore Number of
Bolt Holes
Diameter
of
Bolt
Holes
Diameter
of
Bolts
Diameter
of
Bolt
Circle
Approx.
Weight

Pounds
Kg

O C R X Y T Q
½
1
1 ¼
1 ½
2 Sizes ½ thru 3 ½ are identical to Class 600
2 ½
3
3 ½
4 in. 10 1.38 6.19 5.75 2 1.44 4.63 8 1  7/8 7.88 26
mm 254 35.1 157.2 146.1 50.8 36.6 117.6 25.4 22.2 200.2 12
5 in. 11 1.5 7.31 7 2.12 1.69 5.69 8 1  7/8 9.25 31
mm 279.4 38.1 185.7 177.8 53.8 42.9 144.5 25.4 22.2 235 14
6 in. 12.5 1.62 8.5 8.12 2.25 1.81 6.75 12 1  7/8 10.62 44
mm 317.5 41.1 215.9 206.2 57.2 46 171.5 25.4 22.2 269.7 20
8 in. 15 1.88 10.62 10.25 2.69 2 8.75 12 1.12 1 13 67
mm 381 47.8 269.7 260.4 68.3 50.8 222.3 28.4 25.4 330.2 30
10 in. 17.5 2.12 12.75 12.62 2.88 2.19 10.88 16 1.25 1 1/8 15.25 91
mm 444.5 53.8 323.9 320.5 73.2 55.6 276.4 31.8 28.6 387.4 41
12 in. 20.5 2.25 15 14.75 3.12 2.38 12.94 16 1.38 1 ¼ 17.75 130
mm 520.7 57.2 381 374.7 79.2 60.5 328.7 35.1 31.8 450.9 59
14 in. 23 2.38 16.25 16.75 3.31 2.5 14.19 20 1.38 1 ¼ 20.25 180
mm 584.2 60.5 412.8 425.5 84.1 63.5 360.4 35.1 31.8 514.4 82
16 in. 25.5 2.5 18.5 19 3.69 2.69 16.19 20 1.5 1 3/8 22.5 235
mm 647.7 63.5 469.9 482.6 93.7 68.3 411.2 38.1 34.9 571.5 107
18 in. 28 2.62 21 21 3.88 2.75 18.19 24 1.5 1 3/8 24.75 285
mm 711.2 66.5 533.4 533.4 98.6 69.9 462 38.1 34.9 628.7 129
20 in. 30.5 2.75 23 23.12 4 2.88 20.19 24 1.62 1 ½ 27 345
mm 774.7 69.9 584.2 587.2 101.6 73.2 512.8 41.1 38.1 685.8 156
24 in. 36 3 27.25 27.62 4.5 3.25 24.19 24 1.88 1 ¾ 32 510
mm 914.4 76.2 692.2 701.5 114.3 82.6 614.4 47.8 44.5 812.8 231