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B16.36-Welding Neck Orifice Flanges – Class 300

Welding Neck Orifice Flanges

Class 300

  Nominal size O C R X A Y TT No. of holes Diam. of holes Diam. of bolts Diam. of bolt circle
in. 1″ 4.88 1.5 2 2.12 1.32 3.25 01/04/07 4 0.69 5/8″ 3.5
mm.   124 38.1 50.8 53.8 33.5 82.6 6.4   17.5 15.9 88.9
in. 1 1/2″ 6.12 1.5 2.88 2.75 1.9 3.38 01/04/07 4 0.81 3/4″ 4.5
mm.   155.4 38.1 73.2 69.9 48.3 85.9 6.4   20.6 19.1 114.3
in. 2″ 6.5 1.5 3.62 3.31 2.38 3.38 01/04/07 8 0.69 5/8″ 5
mm.   165.1 38.1 91.9 84.1 60.5 85.9 6.4   17.5 15.9 127
in. 2 1/2″ 7.5 1.5 4.12 3.94 2.88 3.5 01/04/07 8 0.81 3/4″ 5.88
mm.   190.5 38.1 104.6 100.1 73.2 88.9 6.4   20.6 19.1 149.4
in. 3″ 8.25 1.5 5 4.62 3.5 3.5 03/08/07 8 0.81 3/4″ 6.62
mm.   209.6 38.1 127 117.3 88.9 88.9 9.5   20.6 19.1 168.1
in. 4″ 10 1.5 6.19 5.75 4.5 3.62 01/02/07 8 0.81 3/4″ 7.88
mm.   254 38.1 157.2 146.1 114.3 91.9 12.7   20.6 19.1 200.2
in. 6″ 12.5 1.5 8.5 8.12 6.63 3.94 01/02/07 12 0.88 3/4″ 10.62
mm.   317.5 38.1 215.9 206.2 168.4 100.1 12.7   22.4 19.1 269.7
in. 8″ 15 1.62 10.62 10.25 8.63 4.38 01/02/07 12 1 7/8″ 13
mm.   381 41.1 269.7 260.4 219.2 111.3 12.7   25.4 22.2 330.2
in. 10″ 17.5 1.88 12.75 12.62 10.75 4.62 01/02/07 16 1.12 1″ 15.25
mm.   444.5 47.8 323.9 320.5 273.1 117.3 12.7   28.4 25.4 387.4
in. 12″ 20.5 2 15 14.75 12.75 5.12 01/02/07 16 1.25 1 1/8″ 17.75
mm.   520.7 50.8 381 374.7 323.9 130 12.7   31.8 28.6 450.9
in. 14″ 23 2.12 16.25 16.75 14 5.62 01/02/07 20 1.25 1 1/8″ 20.25
mm.   584.2 53.8 412.8 425.5 355.6 142.7 12.7   31.8 28.6 514.4
in. 16″ 25.5 2.25 18.5 19 16 5.75 01/02/07 20 1.38 1 1/4″ 22.5
mm.   647.7 57.2 469.9 482.6 406.4 146.1 12.7   35.1 31.8 571.5
in. 18″ 28 2.38 21 21 18 6.25 01/02/07 24 1.38 1 1/4″ 24.75
mm.   711.2 60.5 533.4 533.4 457.2 158.8 12.7   35.1 31.8 628.7
in. 20″ 30.5 2.5 23 23.12 20 6.38 01/02/07 24 1.38 1 1/4″ 27
mm.   774.7 63.5 584.2 587.2 508 162.1 12.7   35.1 31.8 685.8
in. 24″ 36 2.75 27.25 27.62 24 6.62 01/02/07 24 1.62 1 1/2″ 32
mm.   914.4 69.9 692.2 701.5 609.6 168.1 12.7   41.1 38.1 812.8
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