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SLIP-ON ORIFICE FLANGES Class 300

Nominal
Size
NPS		 Outside
Diameter
of
Flange		 Thickness
of
Flange		 Diameter Of Raised
Face		 Diameter Of Hub At Base Length
thru
Hub		 Bore Diameter Of Pressure Connection Number of
Bolt Holes		 Diameter
of
Bolt
Holes		 Diameter
of
Bolts		 Diameter
of
Bolt
Circle
O C R X Y B TT
1 in. 4.88 1.5 2 2.12 1.88 1.36 ¼ 4 0.69  5/8 3.5
mm 124 38.1 50.8 53.8 47.8 34.5 6.4 17.5 15.9 88.9
1 ½ in. 6.12 1 50 2.88 2.75 1.88 1.95 ¼ 4 0.81 ¾ 4.5
mm 155.4 381 73 Z 69.9 47.8 49.5 6.4 20.6 19.1 114.3
2 in. 6.5 1.5 3.62 3.31 1.94 2.44 ¼ 8 0.69  5/8 5
mm 165.1 38.1 91.9 84.1 49.3 62 6.4 17.5 15.9 127
2 ½ in. 7.5 1.5 4.12 3.94 2 2.94 ¼ 8 0.81 ¾ 5.88
mm 19035 38.1 104.6 100.1 50.8 74.7 6.4 20.6 19.1 149.4
3 in. 8.25 1.5 5 4.62 2.06 3.57  3/8 8 0.81 ¾ 6.62
mm 209.6 38.1 127 117.3 52.3 90.7 9.5 20.6 19.1 168.1
4 in. 10 1.5 6.19 5.75 2.12 4.57 ½ 8 0.81 ¾ 7.88
mm 254 38.1 157.2 146.1 53.8 116.1 12.7 20.6 19.1 200.2
6 in. 12.5 1.5 8.5 8.12 2.12 6.72 ½ 12 0.88 ¾ 10.62
mm 317.5 38.1 215.9 206.2 53.8 170.7 12.7 22.4 19.1 269.7
8 in. 15 1.62 10.62 10.25 2.44 8.72 ½ 12 1  7/8 13
mm 381 41.1 269.7 260.4 62 221.5 12.7 25.4 22.2 330.2
10 in. 17.5 1.88 12.75 12.62 2.62 10.88 ½ 16 1.12 1 15.25
mm 444.5 47.8 323.9 320.5 66.5 276.4 12.7 28.4 25.4 387.4
12 in. 20.5 2 15 14.75 2.88 12 88 ½ 16 1.25 1 1/8 17.75
mm 520.7 50.8 381 374.7 73.2 327 2 12.7 31.8 28.6 450.9
14 in. 23 2.12 16.25 16.75 3 14.14 ½ 20 1.25 1 1/8 20.25
mm 584.2 53.8 412.8 425.5 76.2 359.2 12.7 31.8 28.6 514.4
16 in. 25.5 2.25 18.5 19 3.25 16.16 ½ 20 1.38 1 ¼ 22.5
mm 647.7 57.2 469.9 482.6 82.6 410.5 12.7 35.1 31.8 571.5
18 in. 28 2.38 21 21 3.5 18.18 ½ 24 1.38 1 ¼ 24.75
mm 711.2 60.5 533.4 533.4 88.9 461.8 12.7 35.1 31.8 628.7
20 in. 30.5 2.5 23 23.12 3.75 20.2 ½ 24 1.38 1 ¼ 27
mm 774.7 63.5 584.2 587.2 95.3 513.1 12.7 35.1 31.8 685.8
24 in. 36 2.75 27.25 27.62 4.19 24.25 ½ 24 1.62 1 ½ 32
mm 914.4 69.9 692.2 701.5 106.4 616 12.7 41.1 38.1 812.8

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