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Flange Guide

Dimensions Orifice Weld Neck RF flanges ASME B16.36 Class 300

Weld Neck Orifice flange

Other Pressure Classes

300
NPS HUB
DIA
DIA
RF
OUT
SIDE
DIA
MIN
THK
FLG
HGT
FLG
HUB
DIA
DIA OF
TAB
A R O T H X Tg
1 33.4 50.8 125 36.6 81 54 6.4
48.3 73.0 155 36.6 84 70 6.4
2 60.3 92.1 165 36.6 84 84 6.4
73.0 104.8 190 36.6 87 100 6.4
3 88.9 127.0 210 36.6 87 117 9.5
4 114.3 157.2 255 36.6 90 146 12.7
6 168.3 215.9 320 36.6 98 206 12.7
8 219.1 269.9 380 39.7 110 260 12.7
10 273.0 323.8 445 46.1 116 321 12.7
12 323.8 381.0 520 49.3 129 375 12.7
14 355.6 412.8 585 52.4 141 425 12.7
16 406.4 469.9 650 55.6 144 483 12.7
18 457.0 533.4 710 58.8 157 533 12.7
20 508.0 584.2 775 62.0 160 587 12.7
24 610.0 692.2 915 68.3 167 702 12.7
Weld Neck Orifice flange
NPS BOLT
CIRCLE
NO OF
BOLTS
DIA OF
HOLES
DIA
STUD
BOLTS
STUD
BOLT
LENGTH
1 88.9 4 11/16 5/8 125
114.3 4 13/16 3/4 135
2 127.0 8 11/16 5/8 125
149.2 8 13/16 3/4 135
3 168.3 8 13/16 3/4 135
4 200.0 8 13/16 3/4 135
6 269.9 12 7/8 3/4 135
8 330.2 12 1 7/8 145
10 387.4 16 1.1/8 1 165
12 450.8 16 1.1/8 180
14 514.4 20 1.1/8 185
16 571.5 20 1.3/8 195
18 628.6 24 1.3/8 205
20 685.8 24 1.3/8 215
24 812.8 24 1.5/8 240

GENERAL NOTES:

Notes:

Measuring lengths of Stud Bolts and Hex bolts

Tolerances
Tolerances on all dimensions shall be as shown in ASME B16.5 except for those shown below.

Pressure Tap Location
Tolerance on location of center of pressure tap hole from flange face shall be:

Bore Diameter

PP
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