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Class 300 Blind Flanges

A Blind flange derived it name blind as it is used to blank off a line it does not have a inside bore it is mounted on corresponding flange with the help of Bolt holes matching with that of the other flange. Blind flanges are widely used in testing facilities of vales or Lines being inspected for leakage etc. A blind flange can also be used to close one end of open line. We have the expertise to manufacture Blind flange for varied applications and varied line sizes and materials.

DIMENSIONS OF CLASS 300 FLANGES (ANSI B 16.5) (in mm)
Nominal Flange Dia of Dia of Bolt Holes No. of Thk of Flange Diameter at Weld Bevel Dia of Hub Length Through Hub Bore 'B' Dia of Depth of Length
Pipe Size Dia Bolt Circle 'D' Holes 'C' 'E' R/F Socket of
'O' 'A' S/O & S/W W/N L/J S/O & S/W L/J R F Threading
Y Y Y B B
1/2'' 15 95.2 66.7 15.9 4 14.3 21.3 38.1 22.2 52.4 22.2 22.3 22.9 34.9 9.5 15.9
3/4'' 20 117.5 82.5 19 4 15.9 26.7 47.6 25.4 57.1 25.4 27.7 28.2 42.9 11.1 15.9
1'' 25 123.8 88.9 19 4 17.5 33.5 54 27 61.9 27 34.5 35 50.8 12.7 17.5
1 ¼'' 32 133.3 98.4 19 4 19 42.2 63.5 27 65.1 27 43.2 43.7 63.5 14.3 20.6
1 ½'' 40 155.6 114.3 22.2 4 20.6 48.3 69.8 30.2 68.3 30.2 49.5 50 73 15.9 22.2
2'' 50 165.1 127 19 8 22.2 60.4 84.1 33.3 69.8 33.3 62 62.5 92.1 17.5 25.4
2 ½'' 65 190.5 149.2 22.2 8 25.4 73.1 100 38.1 76.2 38.1 74.7 75.4 104.8 19 28.6
3'' 80 209.5 168.3 22.2 8 28.6 88.9 117.5 42.9 79.4 42.9 90.7 91.4 127 20.6 30.2
3 ½'' 90 228.5 184.2 22.2 8 30.2 101.6 133.4 44.5 81 44.5 103.4 104.1 140 20.6 31.7
4'' 100 254 200 22.2 8 31.8 114.3 146 47.6 85.7 47.6 116.1 116.8 157.2 23.8 33.3
5'' 125 279.4 234.9 22.2 8 34.9 141.2 177.8 50.8 98.4 50.8 143.8 144.5 185.7 - 36.5
6'' 150 317.5 269.9 22.2 12 36.5 168.4 206.4 52.4 98.4 52.4 170.7 171.4 215.9 - 39.7
8'' 200 381 330.2 25.4 12 41.3 219.2 260.3 61.9 111.1 61.9 221.5 222.2 269.9 - 44.4
10'' 250 444.5 387.3 28.6 16 47.6 273 320.7 66.7 117.5 95.2 276.3 277.4 323.8 - 49.2
12'' 300 520.7 450.8 31.7 16 50.8 323.8 374.6 73 130.2 101.6 327.1 328.2 381 - 55.6
14'' 350 584.2 514.3 31.7 20 54 355.6 425.4 76.2 142.9 111.1 359.1 360.2 412.7 - 57.1
16'' 400 647.7 571.5 34.9 20 57.2 406.4 482.6 82.5 146 120.6 410.5 411.2 469.9 - 63.5
18'' 450 711.2 628.5 34.9 24 60.3 457.2 533.4 88.9 158.7 130.2 461.8 462.3 533.4 - 68.3
20'' 500 774.7 685.8 34.9 24 63.5 508 587.4 95.2 161.9 139.7 513.1 514.3 584.2 - 73
24'' 600 914.4 812.8 41.3 24 69.8 609.6 701.7 106.4 168.3 152.4 615.9 615.9 692.1 - 82.5

Note : Thickness 'C' is inclusive of Raised Face Thickness of 1.65 MM. For Class 300