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Stud Reference Charts for Cast Iron Flanges
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 are indicated in the tables below. The sizes are for standard facing and standard pressure ratings flange to flange.
Cast Iron Flanges - Class 125
| 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 |
Cast Iron Flanges - Class 250
| 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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Related Topics
- Dimensions - Sizes and dimensions of pipes and tubes, and their fittings - inside and outside diameter, weight and more
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Related Documents
- Cast Iron Flanged Pipe Fittings - Working Pressures - Maximum working pressure of cast iron pipe fittings - flanged fittings according ANSI B16.1
- Cast Iron Flanges - ASME/ANSI Class 125 - ASME/ANSI B16.1 - 1998 - Cast Iron Pipe Flanges and Flanged Fittings - Class 125 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts
- Cast Iron Flanges - ASME/ANSI Class 25 - ASME/ANSI B16.1 - 1998 - Cast Iron Pipe Flanges and Flanged Fittings - Class 25 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts
- Cast Iron Flanges - ASME/ANSI Class 250 - ASME/ANSI B16.1 - 1998 - Cast Iron Pipe Flanges and Flanged Fittings - Class 250 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts
