Forged Steel Flanges - Stud Charts
Number of studs, diameter and length for ANSI forged steel flanges ranging class 150 to 1500.
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Stud numbers, diameters and lengths 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 charts are for standard facing and standard pressure ratings flange to flange.
Forged Steel Flanges - Class 150
| 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 |
| 20 | 20 | 1-1/8 | 6-1/2 |
| 24 | 20 | 1-1/4 | 7 |
- 1 inch = 25.4 mm
Forged Steel Flanges - Class 300
| 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 | 1-1/8 | 7 |
| 14 | 20 | 1-1/8 | 7-1/4 |
| 16 | 20 | 1-1/4 | 7-3/4 |
| 18 | 24 | 1-1/4 | 8 |
| 20 | 24 | 1-1/4 | 8-1/4 |
| 24 | 24 | 1-1/2 | 9-1/4 |
Forged Steel Flanges - Class 400
| 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 | 5/8 | 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 |
| 20 | 24 | 1-1/2 | 9-3/4 |
| 24 | 24 | 1-3/4 | 10-3/4 |
Forged Steel Flanges - Class 600
| 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 | 5/8 | 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 |
| 20 | 24 | 1-5/8 | 11-1/2 |
| 24 | 24 | 1-7/8 | 13 |
Forged Steel Flanges - Class 900
| 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 | 1 | 5-3/4 |
| 2 | 8 | 7/8 | 6 |
| 2-1/2 | 8 | 1 | 6-1/2 |
| 3 | 8 | 7/8 | 6 |
| 4 | 8 | 1-1/8 | 7 |
| 5 | 8 | 1-1/4 | 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 |
| 20 | 20 | 2 | 14 |
| 24 | 20 | 2-1/2 | 17-1/2 |
Forged Steel Flanges - Class 1500
| 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 | 1 | 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 | 2-1/2 | 18 |
| 18 | 16 | 2-3/4 | 19-1/2 |
| 20 | 16 | 3 | 21-1/2 |
| 24 | 16 | 3-1/2 | 24-1/2 |
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