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The number, diameter and length of studs for cast iron flanges class 125 and 250
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The studs sizes for cast iron flanges class 125 and 250 can be found in the tables below. The sizes are for standard facing and standard pressure ratings flange to flange.
| NPS
(in) |
No. of
Studs |
Diameter of Stud
(in) |
Length of Stud
(in) |
| 1/2 | 4 | 1/2 | 2-1/2 |
| 3/4 | 4 | 1/2 | 2-1/2 |
| 1 | 4 | 1/2 | 2-3/4 |
| 1-1/4 | 4 | 1/2 | 2-3/4 |
| 1-1/2 | 4 | 1/2 | 3 |
| 2 | 4 | 5/8 | 3-1/2 |
| 2-1/2 | 4 | 5/8 | 3-3/4 |
| 3 | 4 | 5/8 | 3-3/4 |
| 3-1/2 | 8 | 5/8 | 3-3/4 |
| 4 | 8 | 5/8 | 3-3/4 |
| 5 | 8 | 3/4 | 4 |
| 6 | 8 | 3/4 | 4-1/4 |
| 8 | 8 | 3/4 | 4-1/2 |
| 10 | 12 | 7/8 | 4-3/4 |
| 12 | 12 | 7/8 | 5 |
| 14 | 12 | 1 | 5-1/2 |
| 16 | 16 | 1 | 5-1/2 |
| NPS
(in) |
No. of
Studs |
Diameter of Stud
(in) |
Length of Stud
(in) |
| 1/2 | 4 | 1/2 | 2-3/4 |
| 3/4 | 4 | 5/8 | 3-1/4 |
| 1 | 4 | 5/8 | 3-1/4 |
| 1-1/4 | 4 | 5/8 | 3-1/2 |
| 1-1/2 | 4 | 5/8 | 3-3/4 |
| 2 | 8 | 5/8 | 3-3/4 |
| 2-1/2 | 8 | 5/8 | 4-1/4 |
| 3 | 8 | 5/8 | 4-1/2 |
| 3-1/2 | 8 | 5/8 | 4-1/2 |
| 4 | 8 | 5/8 | 4-3/4 |
| 5 | 8 | 5/8 | 5 |
| 6 | 12 | 5/8 | 5 |
| 8 | 12 | 7/8 | 5-3/4 |
| 10 | 16 | 1 | 6-1/2 |
| 12 | 16 | 1-1/8 | 7 |
| 14 | 20 | 1-1/8 | 7-1/4 |
| 16 | 20 | 1-1/4 | 7-3/4 |
| 18 | 24 | 1-1/4 | 8 |
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