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B16.36-Welding Neck Orifice Flanges – Class 1500

Welding Neck Orifice Flanges

Class 1500

  Nom. size O C R X A A TT No. of holes Diam. of holes Diam. of
bolts
Diam. of bolt circle Groove #
    O C R X A Y TT          
in. 1″ 5.88 1.5 2 2.06 1.32 3.25 1/04/07 4 1 7/8″ 4 R16
mm.   149.4 38.1 50.8 52.3 33.5 82.6 6.4   25.4 22.2 101.6  
in. 1 1/2″ 7 1.5 2.88 2.75 1.9 3.5 1/04/07 4 1.12 1″ 4.88 R20
mm.   177.8 38.1 73.2 69.9 48.3 88.9 6.4   28.4 25.4 124  
in. 2″ 8.5 1.5 3.62 4.12 2.38 4 1/04/07 8 1 7/8″ 6.5 R24
mm.   215.9 38.1 91.9 104.6 60.5 101.6 6.4   25.4 22.2 165.1  
in. 2 1/2″ 9.62 1.62 4.12 4.88 2.88 4.12 1/04/07 8 1.12 1″ 7.5 R27
mm.   244.3 41.1 104.6 124 73.2 104.6 6.4   28.4 25.4 190.5  
in. 3″ 10.5 1.88 5 5.25 3.5 4.62 3/08/07 8 1.25 1 1/8″ 8 R35
mm.   266.7 47.8 127 133.4 88.9 117.3 9.5   31.8 28.6 203.2  
in. 4″ 12.25 2.12 6.19 6.38 4.5 4.88 1/02/07 8 1.38 1 1/4″ 9.5 R39
mm.   311.2 53.8 157.2 162.1 114.3 124 12.7   35.1 31.8 241.3  
in. 6″ 15.5 3.25 8.5 9 6.63 6.75 1/02/07 12 1.5 1 3/8″ 12.5 R46
mm.   393.7 82.6 215.9 228.6 168.4 171.5 12.7   38.1 34.9 317.5  
in. 8″ 19 3.62 10.62 11.5 8.63 8.38 1/02/07 12 1.75 1 5/8″ 15.5  
mm.   482.6 91.9 269.7 292.1 219.2 212.9 12.7   44.5 41.3 393.7  
in. 10″ 23 4.25 12.75 14.5 10.75 10 1/02/07 12 2 1 7/8″ 19  
mm.   584.2 108 323.9 368.3 273.1 254 12.7   50.8 47.6 482.6  
in. 12″ 26.5 4.88 15 17.75 12.75 11.12 1/02/07 16 2.12 2″ 22.5  
mm.   673.1 124 381 450.9 323.9 282.4 12.7   53.8 50.8 571.5  
in. 14″ 29.5 5.25 16.25 19.5 14 11.75 1/02/07 16 2.38 2 1/4″ 25  
mm.   749.3 133.4 412.8 495.3 355.6 298.5 12.7   60.5 57.2 635  
in. 16″ 32.5 5.75 18.5 21.75 16 12.25 1/02/07 16 2.6 2 1/2″ 27.8  
mm.   825.5 146.1 469.9 552.5 406.4 311.2 12.7   66.5 63.5 704.9  
in. 18″ 36 6.38 21 23.5 18 12.88 1/02/07 16 2.88 2 3/4″ 30.5  
mm.   914.4 162.1 533.4 596.9 457.2 327.2 12.7   73.2 69.9 774.7  
in. 20″ 38.75 7 23 25.25 20 14 1/02/07 16 3.12 3″ 32.75  
mm.   984.3 177.8 584.2 641.4 508 355.6 12.7   79.2 76.2 831.9  
in. 24″ 46 8 27.25 30 24 16 1/02/07 16 3.62 3 1/2″ 39  
mm.   1168.4 203.2 692.2 762 609.6 406.4 12.7   91.9 88.9 990.6  
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