ANSI/ASME B16.5 Class 300 Flange Bolting Dimensions

ASME B16.5 Class 150

Templates for Drilling Class 300 Flanges

Templates for Drilling Class 300 Flanges
Nominal Pipe Size, NPS Outside Diameter of Flange, O Drilling Length of Bolts, L
Diameter of Bolt Circle, W Diameter of Bolts Holes, in. Number of Bolts Diameter of Bolts, in. Stud Bolts Machine Bolts
2mm Raised Face Ring Joint 2mm Raised Face
1/2 95 66.7 5/8 4 1/2 65 75 55
3/4 115 82.6 3/4 4 5/8 75 90 65
1 125 88.9 3/4 4 5/8 75 90 65
1 1/4 135 98.4 3/4 4 5/8 85 95 70
1 1/2 155 114.3 7/8 4 3/4 90 100 75
2 165 127.0 3/4 8 5/8 90 100 75
2 1/2 190 149.2 7/8 8 3/4 100 115 85
3 210 168.3 7/8 8 3/4 110 120 90
3 1/2 230 184.2 7/8 8 3/4 110 125 95
4 255 200.0 7/8 8 3/4 115 125 95
5 280 235.0 7/8 8 3/4 120 135 110
6 320 269.9 7/8 12 3/4 120 140 110
8 380 330.2 1 12 7/8 140 150 120
10 445 387.4 1 1/8 16 1 160 170 140
12 520 450.8 1 1/4 16 1 1/8 170 185 145
14 585 514.4 1 1/4 20 1 1/8 180 190 160
16 650 571.5 1 3/8 20 1 1/4 190 205 165
18 710 628.6 1 3/8 24 1 1/4 195 210 170
20 775 685.8 1 3/8 24 1 1/4 205 220 185
24 915 812.8 1 5/8 24 1 1/2 230 255 205
NOTES :
  • Dimension of Table 7 are in Millimeters, except for diameters of bolts and bolts holes, which are in inch units.
  • Length of stud bolts does not include the height of the points.
  • Bolt lengths not shown in table may be determined in accordance with Annex D.