Welding Neck Orifice Class 400 Flanges
Weld Neck Orifice Flange

 

Welding Neck Orifice Class 400
  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 4 #### 1.50 6.19 5.75 4.50 3.50  1/2 7.88 1.00 8  7/8 R37 5.875 0.312 0.469 0.03 1.06
mm   254.0 38.1 157 146 114.3 88.9 12.7 200.2 25.4   22.2   ####### 7.925 ###### 0.8 26.9
in 6    #### 1.62 8.50 8.12 6.63 4.06  1/2 10.62 1.00 12  7/8 R45 8.312 0.312 0.469 0.03 1.06
mm   317.5 41.1 216 206 168.4 103 12.7 269.7 25.4   22.2   ####### 7.925 ###### 0.8 26.9
in 8 #### 1.88 10.62 10.25 8.63 4.62  1/2 13.00 1.12 12 1    R49 10.625 0.312 0.469 0.03 1.06
mm   381.0 47.8 270 260 219.2 117 12.7 330.2 28.4   25.4   ####### 7.925 ###### 0.8 26.9
in 10    #### 2.12 12.75 12.62 10.75 4.88  1/2 15.25 1.25 16 1 1/8 R53 12.750 0.312 0.469 0.03 1.06
mm   444.5 53.8 324 321 273.1 124.0 12.7 387.4 31.8   28.6   ####### 7.925 ###### 0.8 26.9
in 12 #### 2.25 15.00 14.75 12.75 5.38  1/2 17.75 1.38 16 1 1/4 R57 15.000 0.312 0.469 0.03 1.06
mm   520.7 57.2 381.0 375 323.9 137 12.7 450.9 35.1   31.8   ####### 7.925 ###### 0.8 26.9
in 14 #### 2.39 16.25 16.75 14.00 5.88  1/2 20.25 1.38 20 1 1/4 R61 16.500 0.312 0.469 0.03 1.06
mm   584.2 60.7 413 426 355.6 149 12.7 514.4 35.1   31.8   ####### 7.925 ###### 0.8 26.9
in 16 #### 2.50 18.50 19.00 16.00 6.00  1/2 22.50 1.50 20 1 3/8 R65 18.500 0.312 0.469 0.03 1.19
mm   647.7 63.5 470 483 406.4 152 12.7 571.5 38.1   34.9   ####### 7.925 ###### 0.8 30.2
in 18 #### 2.62 21.00 21.00 18.00 6.50  1/2 24.75 1.50 24 1 3/8 R69 21.000 0.312 0.469 0.03 1.19
mm   711.2 66.5 533 533 457.2 165 12.7 628.7 38.1   34.9   ####### 7.925 ###### 0.8 30.2
in 20 #### 2.75 23.00 23.12 20.00 6.62  1/2 27.00 1.62 24 1 1/2 R73 23.000 0.375 0.531 0.06 1.25
mm   774.7 69.9 584 587 508.0 168 12.7 685.8 41.1   38.1   ####### 9.525 ###### 1.5 31.8
in 24 #### 3.00 27.25 27.62 24.00 6.88  1/2 32.00 1.89 24 1 3/4            
mm   914.4 76.2 692.2 702 609.6 174.8 12.7 812.8 48.0   44.5            
Note:  Weld Neck flanges NPS 3" and smaller are identical to Class 600 flanges and may be so marked.
1.  Bore diamter to be specified by purchaser.
2.  Other NPT and SW connections available upon request.  

Welding Neck Orifice Class 400 Flanges Flange PDF (for printing).