Blind Flanges

Blind Flange Manufacturer, Supplier and Exporter in Mumbai, India

Blind Flange Specifications

Family Blind Flange Shape Blind
Material Stainless Steel, Carbon Steel, Alloy Steel, Duplex Steel, Nickel Alloy Make TII
Size 1/2″-48″
Finish Shot Blast, Sand Blast, Electro polish End Bevelled
Marking TII-Specs-Description-Heat No. Packing Protected by Cap

Dimensions of Class 150 Blind Flanges as per ASME B16.5

NPS F. Dia Dia of Bolt Circle Dia of Bolt Holes No. of Holes Thk of Flange Dia of Hub Dia of R/F
(MM) (Inches) O A D C E R
15 1/2 88.9 60.3 15.9 4 11.1 30.2 34.9
20 3/4 98.4 69.8 15.9 4 12.7 38.1 42.9
25 1 107.9 79.4 15.9 4 14.3 49.2 50.8
32 1 1/4 117.5 88.9 15.9 4 15.9 58.7 63.5
40 1 1/2 127.0 98.0 15.9 4 17.5 65.1 73.0
50 2 152.4 120.6 19.0 4 19.0 77.8 92.1
65 2 1/2 177.8 139.7 19.0 4 22.0 90.5 104.8
80 3 190.5 152.4 19.0 4 23.8 107.9 127.0
100 4 228.6 190.5 19.0 8 23.8 134.9 157.2
125 5 254.0 215.9 22.2 8 23.8 163.5 185.7
150 6 279.4 241.3 22.2 8 25.4 192.1 215.9
200 8 342.9 298.4 22.2 8 28.6 246.1 269.9
250 10 406.4 361.9 25.4 12 30.2 304.8 323.8
300 12 482.6 431.8 25.4 12 31.8 361.5 381.0
350 14 533.4 476.2 28.6 12 34.9 400.0 412.7
400 16 596.9 539.7 28.6 16 36.5 457.2 469.9
450 18 635.0 577.8 31.7 16 39.7 504.8 533.4
500 20 698.1 635.0 31.7 20 42.9 558.8 584.2
600 24 812.8 749.3 34.9 20 47.6 663.6 692.1

Dimensions of Class 300 Blind Flanges as per ASME B16.5

NPS F. Dia Dia of Bolt Circle Dia of Bolt Holes No. of Holes Thk of Flange Dia of Hub Dia of R/F
(MM) (Inches) O A D C E R
15 1/2 95.2 66.7 15.9 4 14.3 38.1 34.9
20 3/4 117.5 82.5 19.0 4 15.9 47.6 42.9
25 1 123.8 88.9 19.0 4 17.5 54.0 50.8
32 1 1/4 133.3 98.4 19.0 4 19.0 63.5 63.5
40 1 1/2 155.6 114.3 22.2 4 20.6 69.8 73.0
50 2 165.1 127.0 19.0 8 22.2 84.1 92.1
65 2 1/2 190.5 149.2 22.2 8 25.4 100.0 104.8
80 3 209.5 168.3 22.2 8 28.6 117.5 127.0
100 4 254.0 200.0 22.2 8 31.8 146.0 157.2
125 5 279.4 234.9 22.2 8 34.9 177.8 185.7
150 6 317.5 269.9 22.2 12 36.5 206.4 215.9
200 8 381.0 330.2 25.4 12 41.3 260.3 269.9
250 10 444.5 387.3 28.6 16 47.6 320.7 323.8
300 12 520.7 450.8 31.7 16 50.8 374.6 381.0
350 14 584.2 514.3 31.7 20 54.0 425.4 412.7
400 16 647.7 571.5 34.9 20 57.2 482.6 469.9
450 18 711.2 628.5 34.9 24 60.3 533.4 533.4
500 20 774.7 685.8 34.9 24 63.5 587.4 584.2
600 24 914.4 812.8 41.3 24 69.8 701.7 692.1

Dimensions of Class 600 Blind Flanges as per ASME B16.5

NPS F. Dia Dia of Bolt Circle Dia of Bolt Holes No. of Holes Thk of Flange Dia of Hub Dia of R/F
(MM) (Inches) O A D C E R
15 1/2 95.2 66.7 15.9 4 14.3 38.1 34.9
20 3/4 117.5 82.5 19.0 4 15.9 47.6 42.9
25 1 123.8 88.9 19.0 4 17.5 54.0 50.8
32 1 1/4 133.3 98.4 19.0 4 20.6 63.5 63.5
40 1 1/2 155.6 114.3 22.2 4 22.2 69.8 73.0
50 2 165.1 127.0 19.0 8 25.4 84.1 92.1
65 2 1/2 190.5 149.2 22.2 8 28.6 100.0 104.8
80 3 209.5 168.3 22.2 8 31.8 117.5 127.0
100 4 254.0 215.9 25.4 8 38.1 152.4 157.2
125 5 279.4 266.7 28.6 8 44.4 188.9 185.7
150 6 317.5 292.1 28.6 12 47.6 222.2 215.9
200 8 381.0 349.2 31.7 12 55.6 273.0 269.9
250 10 444.5 431.8 34.9 16 63.5 342.9 323.8
300 12 520.7 488.9 34.9 16 66.7 400.0 381.0
350 14 584.2 527.0 38.1 20 69.9 431.8 412.7
400 16 647.7 603.2 41.3 20 76.2 495.3 469.9
450 18 711.2 654.0 44.4 24 82.6 546.1 533.4
500 20 774.7 723.9 44.4 24 88.9 609.6 584.2
600 24 914.4 838.2 50.8 24 101.6 717.5 692.1

Dimensions of Class 900 Blind Flanges as per ASME B16.5

NPS F. Dia Dia of Bolt Circle Dia of Bolt Holes No. of Holes Thk of Flange Dia of Hub Dia of R/F
(MM) (Inches) O A D C E R
15 1/2 120.6 82.5 22.2 4 22.2 38.1 34.9
20 3/4 130.2 88.9 22.2 4 25.4 44.4 42.9
25 1 149.2 101.6 25.4 4 28.6 52.4 50.8
32 1 1/4 158.7 111.1 25.4 4 28.6 63.5 63.5
40 1 1/2 177.8 123.8 28.6 4 31.8 69.8 73.0
50 2 215.9 165.1 25.4 8 38.1 104.8 92.1
65 2 1/2 244.5 190.5 28.6 8 41.3 123.8 104.8
80 3 241.3 190.5 25.4 8 38.1 127.0 127.0
100 4 292.1 234.9 31.7 8 44.4 158.7 157.1
125 5 349.2 279.4 35.0 8 50.8 190.5 185.7
150 6 381.0 317.5 31.7 12 55.6 234.9 215.9
200 8 469.9 393.7 38.1 12 63.5 298.4 269.3
250 10 546.1 469.9 38.1 16 69.8 368.3 323.8
300 12 609.6 533.4 38.1 20 79.3 419.1 381.0

Dimensions of Class 1500 Blind Flanges as per ASME B16.5

NPS F. Dia Dia of Bolt Circle Dia of Bolt Holes No. of Holes Thk of Flange Dia of Hub Dia of R/F
(MM) (Inches) O A D C E R
15 1/2 120.6 82.5 22.2 4 22.2 38.1 34.9
20 3/4 130.2 88.9 22.2 4 25.4 44.4 42.9
25 1 149.2 101.6 25.4 4 28.6 52.4 50.8
32 1 1/4 158.7 111.1 25.4 4 28.6 63.5 63.5
40 1 1/2 177.8 123.8 28.6 4 31.8 69.8 73.0
50 2 215.9 165.1 25.4 8 38.1 104.8 92.1
65 2 1/2 244.5 190.5 28.6 8 41.3 123.8 104.8
80 3 266.7 203.2 31.7 8 47.6 133.3 127.0
100 4 311.1 241.3 34.9 8 54.0 161.9 157.1
125 5 374.6 292.1 41.3 8 73.0 196.8 185.7
150 6 393.7 317.5 38.1 12 82.6 228.6 215.9
200 8 482.6 393.5 44.4 12 92.1 292.1 269.3
250 10 584.2 482.6 50.8 12 107.9 368.3 323.8
300 12 673.1 571.5 54.0 16 123.8 450.8 381.0

Dimensions of Class 2500 Blind Flanges as per ASME B16.5

NPS F. Dia Dia of Bolt Circle Dia of Bolt Holes No. of Holes Thk of Flange Dia of Hub Dia of R/F
(MM) (Inches) O A D C E R
15 1/2 133.7 88.9 22.2 4 30.2 42.9 34.9
20 3/4 139.7 95.2 22.2 4 31.7 50.8 42.9
25 1 158.7 107.9 25.4 4 34.9 57.1 50.8
32 1 1/4 184.1 130.2 28.6 4 38.1 73.0 63.5
40 1 1/2 203.2 146.0 31.7 4 44.4 79.4 73.0
50 2 234.9 171.9 28.6 8 50.8 95.2 92.1
65 2 1/2 266.7 196.8 31.7 8 57.1 114.3 104.8
80 3 304.8 228.6 34.9 8 66.7 133.3 127.0
100 4 355.6 273.0 41.3 8 76.2 165.1 157.2
125 5 419.1 323.8 47.6 8 92.1 203.2 185.7
150 6 482.6 368.3 54.0 8 107.9 234.9 215.9
200 8 552.4 438.1 54.0 12 127.0 304.8 269.9
250 10 673.1 539.7 66.7 12 165.1 374.6 323.8
300 12 762.0 619.1 73.0 12 184.1 441.3 381.0

Tolerance Chart

Blind Flanges Tolerance
*Outside diameter O.D. 500 or smaller ± 1.6
O.D. over 600 ± 3.1
Inside diameter threaded to standard gauge limits slip on: lap joint: socket welding
250 and smaller + 0.7 − 0.0
300 and largee + 1.6 − 0.0
diameter of counter bore threaded
250 and smaller + 0.7 − 0.0
300 and large + 1.6 − 0.0
*Outside diameter of hub 300 and smaller + 2.3 − 1.6
350 and larger ± 3.1
diameter of contract face 1.6 raised face ± 0.7
6.3 raised face : tongue and grooved male and female ± 0.4
thickness 450 and smaller + 3.1 − 0.0
500 and larger + 4.7 − 0.0
*length through hub 250 and smaller ± 1.6
300 and larger ± 3.1
drilling bolt circle ± 1.6
bolt hole spacing ± 0.7
eccenticity with respect of to bore 0.7 max