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THREADED FLANGES ASME B16.5 Class 900

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 2 ½ are identical to Class 1500
2 ½
3 in. 9.5 1.5 5 5 2.12 1.62 3.63 8 1  7/8 7.5 26
mm 241.3 38.1 127 127 53.8 41.1 92.2 25.4 22.2 190.5 12
4 in. 11.5 1.75 6.19 6.25 2.75 1.88 4.63 8 1.25 1 1/8 9.25 53
mm 292.1 44.5 157.2 158.8 69.9 47.8 117.6 31.8 28.6 235 24
5 in. 13.75 2 7.31 7.5 3.12 2.12 5.69 8 1.38 1 ¼ 11 83
mm 349.3 50.8 185.7 190.5 79.2 53.8 144.5 35.1 31.8 279.4 38
6 in. 15 2.19 8.5 9.25 3.38 2.25 6.75 12 1.25 1 1/8 12.5 110
mm 381 55.6 215.9 235 85.9 57.2 171.5 31.8 28.6 317.5 50
8 in. 18.5 2.5 10.62 11.75 4 2.5 8.75 12 1.5 1 3/8 15.5 170
mm 469.9 63.5 269.7 298.5 101.6 63.5 222.3 38.1 34.9 393.7 77
10 in. 21.5 2.75 12.75 14.5 4.25 2.81 10.88 16 1.5 1 3/8 18.5 245
mm 546.1 69.9 323.9 368.3 108 71.4 276.4 38.1 34.9 469.9 111
12 in. 24 3.12 15 16.5 4.62 3 12.94 20 1.5 1 3/8 21 325
mm 609.6 79.2 381 419.1 117.3 76.2 328.7 38.1 34.9 533.4 147
14 in. 25.25 3.38 16.25 17.75 5.12 3.25 14.19 20 1.62 1 ½ 22 400
mm 641.4 85.9 412.8 450.9 130 82.6 360.4 41.1 38.1 558.8 181
16 in. 27.75 3.5 18.5 20 5.25 3.38 16.19 20 1.75 1 5/8 24.25 425
mm 704.9 88.9 469.9 508 133.4 85.9 411.2 44.5 41.3 616 193
18 in. 31 4 21 22.25 6 3.5 18.19 20 2 1 7/8 27 600
mm 787.4 101.6 533.4 565.2 152.4 88.9 462 50.8 47.6 685.8 272
20 in. 33.75 4.25 23 24.5 6.25 3.62 20.19 20 2.12 2 29.5 730
mm 857.3 108 584.2 622.3 158.8 91.9 512.8 53.8 50.8 749.3 331
24 in. 41 5.5 27.25 29.5 8 4 24.19 20 2.62 2 ½ 35.5 1400
mm 1041.4 139.7 692.2 749.3 203.2 101.6 614.4 66.5 63.5 901.7 635

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