Welding Neck Orifice Class 2500 Flanges
Weld Neck Orifice Flange
Welding Neck Orifice Class 2500
  Drilling     Ring Type Joint
  Nom  Size OD Thickness OD of RF Dia at Base Dia Bevel LTH Dia of Pressure Connection Bolt Circle Hole Dia # of holes Bolt Dia Grove # Pitch Dia Groove Depth Groove Width Rad at Bottom Spec Oval RH
O C R X A Y TT           P E F r max W
in 1 6.25 1.50 2.00 2.25 1.32 3.62  1/4 4.25 1.00 4  7/8 R18 2.375 0.250 0.344 0.03 1.00
mm   158.8 38.1 50.8 57.2 33.5 91.9 6.4 108.0 25.4   22.2   60.325 6.350 8.738 0.8 25.4
in 1 1/2 8.00 1.75 2.88 3.12 1.90 4.38  1/4 5.75 1.25 4 1 1/8 R23 3.250 0.312 0.469 0.03 1.06
mm   203.2 44.5 73.2 79.2 48.3 111.3 6.4 146.1 31.8   28.6   82.550 7.925 11.913 0.8 26.9
in 2 9.25 2.00 3.62 3.75 2.38 5.00  1/4 6.75 1.12 8 1    R26 4.000 0.312 0.469 0.03 1.06
mm   235.0 50.8 91.9 95.3 60.5 127.0 6.4 171.5 28.4   25.4   101.600 7.925 11.913 0.8 26.9
in 2 1/2 10.50 2.25 4.12 4.50 2.88 5.62  1/4 7.75 1.25 8 1 1/8 R28 4.375 0.375 0.531 0.06 1.19
mm   266.7 57.2 104.6 114.3 73.2 142.7 6.4 196.9 31.8   28.6   111.125 9.525 13.487 1.5 30.2
in 3 12.00 2.62 5.00 5.25 3.50 6.62  3/8 9.00 1.38 8 1 1/4 R32 5.000 0.375 0.531 0.06 1.19
mm   304.8 66.5 127.0 133.4 88.9 168.1 9.5 228.6 35.1   31.8   127.000 9.525 13.487 1.5 30.2
in 4    14.00 3.00 6.19 6.50 4.50 7.50  1/2 10.75 1.62 8 1 1/2 …….. …….. …….. …….. …….. ……..
mm   355.6 76.2 157.2 165.1 114.3 190.5 12.7 273.1 41.1   38.1 …….. …….. …….. …….. …….. ……..
in 6 19.00 4.25 8.50 9.25 6.63 10.75  1/2 14.50 2.12 8 2    …….. …….. …….. …….. …….. ……..
mm   482.6 108.0 215.9 235.0 168.4 273.1 12.7 368.3 53.8   50.8 ……. ……. ……. ……. ……. …….
in 8    21.75 5.00 10.62 12.00 8.63 12.50  1/2 17.25 2.12 12 2    …….. …….. …….. …….. …….. ……..
mm   552.5 127.0 269.7 304.8 219.2 317.5 12.7 438.2 53.8   50.8 …….. …….. …….. …….. …….. ……..
in 10 26.50 6.50 12.75 14.75 10.75 16.50  1/2 21.25 2.62 12 2 1/2 …….. …….. …….. …….. …….. ……..
mm   673.1 165.1 323.9 374.7 273.1 419.1 12.7 539.8 66.5   63.5 ……. ……. ……. ……. ……. …….
in 12    30.00 7.25 15.00 17.38 12.75 18.25  1/2 24.38 2.88 12 2 3/4 …….. …….. …….. …….. …….. ……..
mm   762.0 184.2 381.0 441.5 323.9 463.6 12.7 619.3 73.2   69.9 …….. …….. …….. …….. …….. ……..
1.  Bore diameter to be specified by purchaser.
2.  Other NPT and SW connections available upon request.

Welding Neck Orifice Class 2500 Flange PDF (for printing).