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Class 400WN Flanges

Special One or Two Piece Ring and Orifice Plate Assembly - Groove Detail

Ring Type Joint Weld Neck Orifice Flanges Class 400 - 2500

Raised Face Weld Neck Orifice Flanges Class 400 - 2500

(Click any image above to enlarge it and lock it in place, then scroll to the bottom table for dimensions)
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 10 1.5 6.19 5.75 4.5 3.5  1/2 7.88 1 8  7/8 R37 5.875 0.312 0.469 0.03 1.06
mm 254 38.1 157 146 114.3 88.9 12.7 200.2 25.4 22.2 149.225 7.925 11.913 0.8 26.9
in 6 12.5 1.62 8.5 8.12 6.63 4.06  1/2 10.62 1 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 22.2 211.125 7.925 11.913 0.8 26.9
in 8 15 1.88 10.62 10.25 8.63 4.62  1/2 13 1.12 12 1 R49 10.625 0.312 0.469 0.03 1.06
mm 381 47.8 270 260 219.2 117 12.7 330.2 28.4 25.4 269.875 7.925 11.913 0.8 26.9
in 10 17.5 2.12 12.75 12.62 10.75 4.88  1/2 15.25 1.25 16 1 1/8 R53 12.75 0.312 0.469 0.03 1.06
mm 444.5 53.8 324 321 273.1 124 12.7 387.4 31.8 28.6 323.850 7.925 11.913 0.8 26.9
in 12 20.5 2.25 15 14.75 12.75 5.38  1/2 17.75 1.38 16 1 1/4 R57 15 0.312 0.469 0.03 1.06
mm 520.7 57.2 381 375 323.9 137 12.7 450.9 35.1 31.8 381.000 7.925 11.913 0.8 26.9
in 14 23 2.39 16.25 16.75 14 5.88  1/2 20.25 1.38 20 1 1/4 R61 16.5 0.312 0.469 0.03 1.06
mm 584.2 60.7 413 426 355.6 149 12.7 514.4 35.1 31.8 419.100 7.925 11.913 0.8 26.9
in 16 25.5 2.5 18.5 19 16 6  1/2 22.5 1.5 20 1 3/8 R65 18.5 0.312 0.469 0.03 1.19
mm 647.7 63.5 470 483 406.4 152 12.7 571.5 38.1 34.9 469.900 7.925 11.913 0.8 30.2
in 18 28 2.62 21 21 18 6.5  1/2 24.75 1.5 24 1 3/8 R69 21 0.312 0.469 0.03 1.19
mm 711.2 66.5 533 533 457.2 165 12.7 628.7 38.1 34.9 533.400 7.925 11.913 0.8 30.2
in 20 30.5 2.75 23 23.12 20 6.62  1/2 27 1.62 24 1 1/2 R73 23 0.375 0.531 0.06 1.25
mm 774.7 69.9 584 587 508 168 12.7 685.8 41.1 38.1 584.200 9.525 13.487 1.5 31.8
in 24 36 3 27.25 27.62 24 6.88  1/2 32 1.89 24 1 3/4
mm 914.4 76.2 692.2 702 609.6 174.8 12.7 812.8 48 44.5

Note: Weld neck flanges NPS 3″ and smaller are identical to Class 600 flanges and may be so marked.

(1) Bore diameter to be specified by purchaser
(2) Other NPT and SW connections available upon request.
Welding Neck Orifice Class 400 Flange PDF (for printing).