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Class 300WN Flanges

Welding Neck Orifice Class 300 FlangeS

(Click any image above to enlarge it and lock it in place, then scroll to the bottom table for dimensions)
Drilling
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
O C R X A Y TT
in 1 4.88 1.5 2 2.12 1.32 3.25  1/4 3.5 0.69 4  5/8
mm 124 38.1 50.8 53.8 33.5 82.6 6.4 88.9 17.5 15.9
in 1 1/2 6.12 1.5 2.88 2.75 1.9 3.38  1/4 4.5 0.81 4  3/4
mm 155.4 38.1 73.2 69.9 48.3 85.9 6.4 114.3 20.6 19.1
in 2 6.5 1.5 3.62 3.31 2.38 3.38  1/4 5 0.69 8  5/8
mm 165.1 38.1 91.9 84.1 60.5 85.9 6.4 127 17.5 15.9
in 2 1/2 7.5 1.5 4.12 3.94 2.88 3.5  1/4 5.88 0.81 8  3/4
mm 190.5 38.1 104.6 100.1 73.2 88.9 6.4 149.4 20.6 19.1
in 3 8.25 1.5 5 4.62 3.5 3.5  3/8 6.62 0.81 8  3/4
mm 209.6 38.1 127 117.3 88.9 88.9 9.5 168.1 20.6 19.1
in 4 10 1.5 6.19 5.75 4.5 3.62  1/2 7.88 0.81 8  3/4
mm 254 38.1 157.2 146.1 114.3 91.9 12.7 200.2 20.6 19.1
in 6 12.5 1.5 8.5 8.12 6.63 3.94  1/2 10.62 0.88 12  3/4
mm 317.5 38.1 215.9 206.2 168.4 100.1 12.7 269.7 22.4 19.1
in 8 15 1.62 10.62 10.25 8.63 4.38  1/2 13 1 12  7/8
mm 381 41.1 269.7 260.4 219.2 111.3 12.7 330.2 25.4 22.2
in 10 17.5 1.88 12.75 12.62 10.75 4.62  1/2 15.25 1.12 16 1   
mm 444.5 47.8 323.9 320.5 273.1 117.3 12.7 387.4 28.4 25.4
in 12 20.5 2 15 14.75 12.75 5.12  1/2 17.75 1.25 16 1 1/8
mm 520.7 50.8 381 374.7 323.9 130 12.7 450.9 31.8 28.6
in 14 23 2.12 16.25 16.75 14 5.62  1/2 20.25 1.25 20 1 1/8
mm 584.2 53.8 412.8 425.5 355.6 142.7 12.7 514.4 31.8 28.6
in 16 25.5 2.25 18.5 19 16 5.75  1/2 22.5 1.38 20 1 1/4
mm 647.7 57.2 469.9 482.6 406.4 146.1 12.7 571.5 35.1 31.8
in 18 28 2.38 21 21 18 6.25  1/2 24.75 1.38 24 1 1/4
mm 711.2 60.5 533.4 533.4 457.2 158.8 12.7 628.7 35.1 31.8
in 20 30.5 2.5 23 23.12 20 6.38  1/2 27 1.38 24 1 1/4
mm 774.7 63.5 584.2 587.2 508 162.1 12.7 685.8 35.1 31.8
in 24 36 2.75 27.25 27.62 24 6.62  1/2 32 1.62 24 1 1/2
mm 914.4 69.9 692.2 701.5 609.6 168.1 12.7 812.8 41.1 38.1

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 300 Flange PDF (for printing).