Stud Bolt dimensions for ASME flanges.
| Nom Pipe Size (inches) |
Nom Pipe Size (mm) |
Number of bolts |
Dia (inch) x Length (mm) |
Ring Number |
|---|---|---|---|---|
| 1/2 | 15 | 4 | 3/4 x 110 | R12 |
| 3/4 | 20 | 4 | 3/4 x 115 | R14 |
| 1 | 25 | 4 | 7/8 x 125 | R16 |
| 1 1/2 | 40 | 4 | 1 x 140 | R20 |
| 2 | 50 | 8 | 7/8 x 145 | R24 |
| 2 1/2 | 65 | 8 | 7/8 x 160 | R27 |
| 3 | 80 | 8 | 7/8 x 145 | R31 |
| 4 | 100 | 8 | 1 1/8 x 170 | R37 |
| Nom Pipe Size (inches) |
Nom Pipe Size (mm) |
Number of bolts |
Dim (inch) x Length (mm) |
Ring Number |
|---|---|---|---|---|
| 6 | 150 | 12 | 1 1/8 x 195 | R45 |
| 8 | 200 | 12 | 1 3/8 x 220 | R49 |
| 10 | 250 | 16 | 1 3/8 x 235 | R53 |
| 12 | 300 | 20 | 1 3/8 x 255 | R57 |
| 14 | 350 | 20 | 1 1/2 x 280 | R62 |
| 16 | 400 | 20 | 1 5/8 x 290 | R66 |
| 18 | 450 | 20 | 1 7/8 x 335 | R70 |
| 20 | 500 | 20 | 2 x 360 | R74 |
| 24 | 600 | 20 | 2 1/2 x 455 | R78 |