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Engineering ToolBox > Forged Steel Flanges - Stud Reference Charts
The studs sizes for ANSI forged steel flanges 150 lb, 300 lb, 400 lb, 600 lb, 900 lb and 1500 lb 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 |
| 18 | 16 | 1-1/8 | 6 |
| 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 | 3/4 | 3-3/4 |
| 2 | 8 | 5/8 | 3-3/4 |
| 2-1/2 | 8 | 3/4 | 4-1/4 |
| 3 | 8 | 3/4 | 4-1/2 |
| 3-1/2 | 8 | 3/4 | 4-1/2 |
| 4 | 8 | 3/4 | 4-3/4 |
| 5 | 8 | 3/4 | 5 |
| 6 | 12 | 3/4 | 5 |
| 8 | 12 | 7/8 | 5-3/4 |
| 10 | 16 | 1 | 6-1/2 |
| 12 | 16 | 1 | 7 |
| 14 | 20 | 1-1/8 | 7-1/4 |
| 16 | 20 | 1-1/4 | 7-3/4 |
| 18 | 24 | 1-1/4 | 8 |
| NPS (in) | No. of Studs | Diameter of Stud (in) | Length of Stud (in) |
| 1/2 | 4 | 1/2 | 3-1/4 |
| 3/4 | 4 | 5/8 | 3-3/4 |
| 1 | 4 | 5/8 | 3-3/4 |
| 1-1/4 | 4 | 5/8 | 4 |
| 1-1/2 | 4 | 3/4 | 4-1/2 |
| 2 | 8 | 3/4 | 4-1/2 |
| 2-1/2 | 8 | 3/4 | 5 |
| 3 | 8 | 3/4 | 5-1/4 |
| 3-1/2 | 8 | 7/8 | 5-3/4 |
| 4 | 8 | 7/8 | 5-3/4 |
| 5 | 8 | 7/8 | 6 |
| 6 | 12 | 7/8 | 6-1/4 |
| 8 | 12 | 1 | 7 |
| 10 | 16 | 1-1/8 | 7-3/4 |
| 12 | 16 | 1-1/4 | 8-1/4 |
| 14 | 20 | 1-1/4 | 8-1/2 |
| 16 | 20 | 1-3/8 | 9 |
| 18 | 24 | 1-3/8 | 9-1/4 |
| NPS (in) | No. of Studs | Diameter of Stud (in) | Length of Stud (in) |
| 1/2 | 4 | 1/2 | 3-1/4 |
| 3/4 | 4 | 5/8 | 3-3/4 |
| 1 | 4 | 5/8 | 3-3/4 |
| 1-1/4 | 4 | 5/8 | 4 |
| 1-1/2 | 4 | 3/4 | 4-1/2 |
| 2 | 8 | 3/4 | 4-1/2 |
| 2-1/2 | 8 | 3/4 | 5 |
| 3 | 8 | 3/4 | 5-1/4 |
| 3-1/2 | 8 | 7/8 | 5-3/4 |
| 4 | 8 | 7/8 | 6 |
| 5 | 8 | 1 | 6-3/4 |
| 6 | 12 | 1 | 7 |
| 8 | 12 | 1-1/8 | 7-3/4 |
| 10 | 16 | 1-1/4 | 8-3/4 |
| 12 | 20 | 1-1/4 | 9 |
| 14 | 20 | 1-3/8 | 9-1/2 |
| 16 | 20 | 1-1/2 | 10-1/4 |
| 18 | 20 | 1-5/8 | 11 |
| NPS (in) | No. of Studs | Diameter of Stud (in) | Length of Stud (in) |
| 1/2 | 4 | 3/4 | 4-1/2 |
| 3/4 | 4 | 3/4 | 4-3/4 |
| 1 | 4 | 7/8 | 5-1/4 |
| 1-1/4 | 4 | 7/8 | 5-1/4 |
| 1-1/2 | 4 | 7/8 | 5-3/4 |
| 2 | 8 | 7/8 | 6 |
| 2-1/2 | 8 | 1 | 6-1/2 |
| 3 | 8 | 1 | 6 |
| 4 | 8 | 1-1/8 | 7 |
| 5 | 8 | 1-1/8 | 7-3/4 |
| 6 | 12 | 1-1/8 | 7-3/4 |
| 8 | 12 | 1-3/8 | 9 |
| 10 | 16 | 1-3/8 | 9-1/2 |
| 12 | 20 | 1-3/8 | 10-1/4 |
| 14 | 20 | 1-1/2 | 11 |
| 16 | 20 | 1-5/8 | 11-1/2 |
| 18 | 20 | 1-7/8 | 13 |
| NPS (in) | No. of Studs | Diameter of Stud (in) | Length of Stud (in) |
| 1/2 | 4 | 3/4 | 4-1/2 |
| 3/4 | 4 | 3/4 | 4-3/4 |
| 1 | 4 | 7/8 | 5-1/4 |
| 1-1/4 | 4 | 7/8 | 5-1/4 |
| 1-1/2 | 4 | 7/8 | 5-3/4 |
| 2 | 8 | 7/8 | 6 |
| 2-1/2 | 8 | 1 | 6-1/2 |
| 3 | 8 | 1-1/8 | 7-1/4 |
| 4 | 8 | 1-1/4 | 8 |
| 5 | 8 | 1-1/2 | 10 |
| 6 | 12 | 1-3/8 | 10-1/2 |
| 8 | 12 | 1-5/8 | 11-3/4 |
| 10 | 12 | 1-7/8 | 13-1/2 |
| 12 | 16 | 2 | 15 |
| 14 | 16 | 2-1/4 | 16-1/2 |
| 16 | 16 | 2-1/4 | 18 |
| 18 | 16 | 2-3/4 | 19-1/2 |