Weld Neck Flange Dimensions
| NPS | O | tf | X |
| 1/2 | 95 | 12.7 | 38 |
| 3/4 | 115 | 14.3 | 48 |
| 1 | 125 | 15.9 | 54 |
| 1-1/4 | 135 | 17.5 | 64 |
| 1-1/2 | 155 | 19.1 | 70 |
| 2 | 165 | 20.7 | 84 |
| 2-1/2 | 190 | 23.9 | 100 |
| 3 | 210 | 27 | 117 |
| 3-1/2 | 230 | 28.6 | 133 |
| 4 | 255 | 30.2 | 146 |
| 5 | 280 | 33.4 | 178 |
| 6 | 320 | 35 | 206 |
| 8 | 380 | 39.7 | 260 |
| 10 | 445 | 46.1 | 321 |
| 12 | 520 | 49.3 | 375 |
| NPS | O | tf | X |
| 14 | 585 | 52.4 | 425 |
| 16 | 650 | 55.6 | 483 |
| 18 | 710 | 58.8 | 533 |
| 20 | 775 | 62 | 587 |
| 24 | 915 | 68.3 | 702 |
[google-square-ad]
Weld Neck Flange Dimensions
| NPS | A | Y | B |
| 1/2 | 21.3 | 51 | 15.8 |
| 3/4 | 26.7 | 56 | 20.9 |
| 1 | 33.4 | 60 | 26.6 |
| 1-1/4 | 42.2 | 64 | 35.1 |
| 1-1/2 | 48.3 | 67 | 40.9 |
| 2 | 60.3 | 68 | 52.5 |
| 2-1/2 | 73 | 75 | 62.7 |
| 3 | 88.9 | 78 | 77.9 |
| 3-1/2 | 101.6 | 79 | 90.1 |
| 4 | 114.3 | 84 | 102.3 |
| 5 | 141.3 | 97 | 128.2 |
| 6 | 168.3 | 97 | 154.1 |
| 8 | 219.1 | 110 | 202.7 |
| 10 | 273 | 116 | 254.6 |
| 12 | 323.8 | 129 | 304.8 |
| NPS | A | Y | B |
| 14 | 355.6 | 141 | BY P |
| 16 | 406.4 | 144 | BY P |
| 18 | 457 | 157 | BY P |
| 20 | 508 | 160 | BY P |
| 24 | 610 | 167 | BY P |
[google-square-ad]
Templates for drilling of bolt holes
Flange Drilling Template
| NPS | BCD | BHD | BOLTS | BD |
| 1/2 | 66.7 | 5/8 | 4 | 1/2 |
| 3/4 | 82.6 | 3/4 | 4 | 5/8 |
| 1 | 88.9 | 3/4 | 4 | 5/8 |
| 1-1/4 | 98.4 | 3/4 | 4 | 5/8 |
| 1-1/2 | 114.3 | 7/8 | 4 | 3/4 |
| 2 | 127.0 | 3/4 | 8 | 5/8 |
| 2-1/2 | 149.2 | 7/8 | 8 | 3/4 |
| 3 | 168.3 | 7/8 | 8 | 3/4 |
| 3-1/2 | 184.2 | 7/8 | 8 | 3/4 |
| 4 | 200.0 | 7/8 | 8 | 3/4 |
| 5 | 235.0 | 7/8 | 8 | 3/4 |
| 6 | 269.9 | 7/8 | 12 | 3/4 |
| 8 | 330.2 | 1 | 12 | 7/8 |
| 10 | 387.4 | 1-1/8 | 16 | 1 |
| 12 | 450.8 | 1-1/4 | 16 | 1-1/8 |
| NPS | BCD | BHD | BOLTS | BD |
| 14 | 514.4 | 1-1/4 | 20 | 1-1/8 |
| 16 | 571.5 | 1-3/8 | 20 | 1-1/4 |
| 18 | 628.6 | 1-3/8 | 24 | 1-1/4 |
| 20 | 685.8 | 1-3/8 | 24 | 1-1/4 |
| 24 | 812.8 | 1-5/8 | 24 | 1-1/2 |
[google-square-ad]
Flange Drilling Template
| NPS | SBL RFY | SBL RJ | MBL RF |
| 1/2 | 65 | 75 | 55 |
| 3/4 | 75 | 90 | 65 |
| 1 | 75 | 90 | 65 |
| 1-1/4 | 85 | 95 | 70 |
| 1-1/2 | 90 | 100 | 75 |
| 2 | 90 | 100 | 75 |
| 2-1/2 | 100 | 115 | 85 |
| 3 | 110 | 120 | 90 |
| 3-1/2 | 110 | 125 | 95 |
| 4 | 115 | 125 | 95 |
| 5 | 120 | 135 | 110 |
| 6 | 120 | 140 | 110 |
| 8 | 140 | 150 | 120 |
| 10 | 160 | 170 | 140 |
| 12 | 170 | 185 | 145 |
| NPS | SBL RFY | SBL RJ | MBL RF |
| 14 | 180 | 190 | 160 |
| 16 | 190 | 205 | 165 |
| 18 | 195 | 210 | 170 |
| 20 | 205 | 220 | 185 |
| 24 | 230 | 255 | 205 |
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General Notes
Dimensions are in millimeters, except for diameters of bolts and bolt holes, which are in inch units.