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The Inside diameter of Weld Neck Flange Bore 2020/12/31 18:46:36

The size of the welding neck flange hole is processed according to the diameter of the pipe, valve or pipe fitting. Therefore, it is important to specify the wall thickness when sending an inquiry. Generally, Eathu’s customers require STD for low pressure pipe wall thickness, SCH80 for medium pressure and SCH160 for high pressure. For Special Requirement for weld neck flange bore please contact Eathu.

The Inside diameter of WN flange bore

DNNPSODSCH 5SSCH 10SSCH 10SCH 20SCH 30SCH 40S STDSCH 40SCH 60SCH 80SXSSCH 80SCH 100SCH 120SCH 140SCH 160XXS
8 1/413.7--10.4------9.29.29.2--7.77.77.7----------
10 3/817.1--13.8------12.512.512.5--10.710.710.7----------
15 1/221.31817.1------15.815.815.8--13.813.813.8------11.76.4
20 3/426.723.422.5------212121--18.918.918.9------15.611.1
25133.430.127.9------26.626.626.6--24.324.324.3------20.715.2
321 1/4 42.238.936.7------35.135.135.1--32.532.532.5------29.522.8
401 1/2 48.34542.8------40.940.940.9--38.138.138.1------3428
50260.35754.8------52.552.552.5--49.249.249.2------42.838.2
652 1/276.171.970------65.865.865.8--62.162.162.1------5748.1
80388.984.782.8------77.977.977.9--73.773.773.7------66.658.4
903 1/2 101.697.495.5------90.190.190.1--85.485.485.4----------
1004114.3110.1108.2------102.3102.3102.3--97.297.297.2--92--87.380.1
1255141.3135.8134.5------128.2128.2128.2--122.2122.2122.2--115.9--109.5103.2
1506168.3162.8161.5------154.1154.1154.1--146.4146.4146.4--139.8--131.8124.4
2008219.1213.6211.6--206.4205202.7202.7202.7198.5193.7193.7193.7188.9182.6177.9173.1174.6
25010273.1266.3264.7--260.4257.5254.6254.6254.6247.7247.7247.7242.9236.6230.2222.3215.9222.3
30012323.9316314.8--311.2307.1304.8304.8303.3295.4298.5298.5288.9281273.1266.7257.3273.1
35014355.6347.7346342.9339.8336.5--336.5333.3325.4--330.2317.5307.9300292.1284.2--
40016406.4398396.8393.7390.6387.3--387.3381373.1--381363.5354344.5333.3325.4--
45018457.2448.8447.6444.5441.4434.9--438.1428.7419.1--431.8409.5398.5387.3377.9366.7--
50020508498.4496.9495.3488.9482.6--488.9477.8466.8--482.6455.6442.9431.8419.1408--
55022559549.4547.9546.3539.9533.6--539.9--514.5--533.6501.8489.1476.4463.7451--
60024610598.9597.3597.3590.9581.5--590.9575560.8--584.6548.1532.2518505.3490.9--
65026660----644.2634.6----640.9------634.6------------
70028711----695.2685.6679.2--691.9------685.6------------
75030762749.3746.2746.2736.6730.2--742.9------736.6------------
80032813----797.2787.6781.2--793.9778----787.6------------
85034864----848.2838.6832.2--844.9825.9----838.6------------
90036914----898.2888.6882.2--894.9------888.6------------

This is the dimention for Inside of weld neck flange bore, for size and drawing of weld neck flange please check from  Weld Neck Flange Size and Drawing

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