Welding Neck Orifice Class 900 Flanges
Weld Neck Orifice Flange
Welding Neck Orifice Class 900
  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 3 9.50 1.50 5.00 5.00 3.50 4.00  3/8 7.50 1.00 8  7/8 R31 4.875 0.312 0.469 0.03 1.06
mm   241.3 38.1 127.0 127.0 88.9 101.6 9.5 190.5 25.40   22.2   #### 7.925 11.913 0.8 26.9
in 4    11.50 1.75 6.19 6.25 4.50 4.50  1/2 9.25 1.25 8 1 1/8 R37 5.875 0.312 0.469 0.03 1.06
mm   292.1 44.5 157.2 158.8 114.3 114.3 12.7 235.0 31.80   28.6   #### 7.925 11.913 0.8 26.9
in 6 15.00 2.19 8.50 9.25 6.63 5.50  1/2 12.50 1.25 12 1 1/8 R45 8.312 0.312 0.469 0.03 1.06
mm   381.0 55.6 215.9 235.0 168.4 139.7 12.7 317.5 31.80   28.6   211.125 7.925 11.913 0.8 26.9
in 8    18.50 2.50 10.62 11.75 8.63 6.38  1/2 15.50 1.50 12 1 3/8 R49 10.625 0.312 0.469 0.03 1.06
mm   469.9 63.5 269.7 298.5 219.2 162.1 12.7 393.7 38.10   34.9   #### 7.925 11.913 0.8 26.9
in 10 21.50 2.75 12.75 14.50 10.75 7.25  1/2 18.50 1.50 16 1 3/8 R53 12.750 0.312 0.469 0.03 1.06
mm   546.1 69.9 323.9 368.3 273.1 184.2 12.7 469.9 38.10   34.9   #### 7.925 11.913 0.8 26.9
in 12 24.00 3.12 15.00 16.50 12.75 7.88  1/2 21.00 1.50 20 1 3/8 R57 15.000 0.312 0.469 0.03 1.06
mm   609.6 79.2 381.0 419.1 323.9 200.2 12.7 533.4 38.10   34.9   #### 7.925 11.913 0.8 26.9
in 14 25.25 3.38 16.25 17.75 14.00 8.38  1/2 22.00 1.62 20 1 1/2            
mm   641.4 85.9 412.8 450.9 355.6 212.9 12.7 558.8 41.10   38.1            
in 16 27.75 3.50 18.50 20.00 16.00 8.50  1/2 24.30 1.75 20 1 5/8            
mm   704.9 88.9 469.9 508.0 406.4 215.9 12.7 616.0 44.50   41.3            
in 18 31.00 4.00 21.00 22.25 18.00 9.00  1/2 27.00 2.00 20 1 7/8            
mm   787.4 101.6 533.4 565.2 457.2 228.6 12.7 685.8 50.80   47.6            
in 20 33.75 4.25 23.00 24.50 20.00 9.75  1/2 29.50 2.12 20 2               
mm   857.3 108.0 584.2 622.3 508.0 247.7 12.7 749.3 53.80   50.8            
in 24 41.00 5.50 27.25 29.50 24.00 11.50  1/2 35.50 2.62 20 2 1/2            
mm   1041.4 139.7 692.2 749.3 609.6 292.1 12.7 901.7 66.50   63.5            
1. Bore diameter to be specified by purchaser.
2. Other NPT and SW connections available upon request.

Welding Neck Orifice Class 900 Flange PDF (for printing).