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Bolt flange selection chart

In this chapter Pipe flange dimensions and details will be covered in ASME B16.5 – In this standard, consider Pipe Flanges and Flanged Fittings for size NPS ½” to 24” .

More than 24″, from NPS 26” to 60”  should be in ASME B16.47. Here only given details for 150 and 300 class flanges size (1/2 TO 24″). rigid coupling

  1. Class 150 RF Flanges Bolts details in MM and INCH
  2. Class 300 RF Flanges Bolts details in MM and INCH

   Class 150 RF Flanges Bolts details in MM and INCH

                     Class 150 RF Flanges Bolts details in MM and INCH
Nominal Pipe Size Flange OD size Flange thickness (with raised face) No. Of Bolts Dia of Bolts(INCH) Bolt Size Stud Length of Stud Machine Bolt Size Machine Bolt Length Pipe Size in mm
1/2 90 14.7 4 0.5 1/2 2-1/4 M14 50 15
3/4 100 16.3 4 0.5 1/2 2-1/2 M14 50 20
1 110 17.9 4 0.5 1/2 2-1/2 M14 55 25
1-1/4 115 19.5 4 0.5 1/2 2-3/4 M14 55 32
1-1/2 125 21.1 4 0.5 1/2 2-3/4 M14 65 40
2 150 22.7 4 0.63 5/8 3-1/4 M16 70 50
2-1/2 180 25.9 4 0.63 5/8 3-1/2 M16 75 65
3 190 29 4 0.63 5/8 3-1/2 M16 75 80
3-1/2 215 30.6 8 0.63 5/8 3-1/2 M16 75 90
4 230 32.2 8 0.63 5/8 3-1/2 M16 75 100
5 255 35.4 8 0.75 3/4 3-3/4 M20 85 125
6 280 37 8 0.75 3/4 4 M20 85 150
8 345 41.7 8 0.75 3/4 4-1/4 M20 90 200
10 405 48.1 12 0.88 7/8 4-1/2 M24 100 250
12 485 51.3 12 0.88 7/8 4-3/4 M24 100 300
14 535 54.4 12 1 1 5-1/4 M27 115 350
16 595 57.6 16 1 1 5-1/4 M27 115 400
18 635 60.8 16 1.13 1 1/8 5-3/4 M30 125 450
20 700 64 20 1.13 1 1/8 6-1/4 M30 140 500
24 815 70.3 20 1.25 1 1/4 6-3/4 M33 150 600

 Class 300 RF Flanges Bolts details in MM and INCH

                                         Class 300 RF Flanges Bolts details in MM and INCH
Nominal Pipe Size Flange OD size Flange thickness (with raised face) No. of Bolts Dia of Bolts(INCH) Bolt Size Stud Length of Stud Machine Bolt Size Machine Bolt Length Pipe Size in mm
1/2 95 14.7 4 0.5 1/2 2-1/2 M14 55 15
3/4 115 16.3 4 0.63 5/8 3 M16 65 20
1 125 17.9 4 0.63 5/8 3 M16 65 25
1-1/4 135 19.5 4 0.63 5/8 3-1/4 M16 70 32
1-1/2 155 21.1 4 0.75 3/4 3-1/2 M20 75 40
2 165 22.7 8 0.63 5/8 3-1/2 M16 75 50
2-1/2 190 25.9 8 0.75 3/4 4 M20 85 65
3 210 29 8 0.75 3/4 4-1/4 M20 90 80
3-1/2 230 30.6 8 0.75 3/4 4-1/4 M20 95 90
4 255 32.2 8 0.75 3/4 4-1/2 M20 95 100
5 280 35.4 8 0.75 3/4 4-3/4 M20 110 125
6 320 37 12 0.75 3/4 4-3/4 M20 110 150
8 380 41.7 12 0.88 7/8 5-1/2 M24 120 200
10 445 48.1 16 1 12/31 6-1/4 M27 140 250
12 520 51.3 16 1.13 1 1/8 6-3/4 M30 145 300
14 585 54.4 20 1.13 1 1/8 7 M30 160 350
16 650 57.6 20 1.25 1 1/4 7-1/2 M33 165 400
18 710 60.8 24 1.25 1 1/4 7-3/4 M33 170 450
20 775 64 24 1.25 1 1/4 8 M33 185 500
24 915 70.3 24 1.5 1 1/2 9 M39 205 600
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