Explore our pipe flange size and bolt chart, a must-have tool for wholesale distributors in the PVF (pipe, valve, and fitting) industry. Pipe flanges play a crucial role in connecting piping systems securely, using bolted arrangements and gaskets for a reliable seal.
From determining the right bolt patterns to choosing the most suitable connection types, our pipe flange size and bolt chart empowers wholelsale distributors to make informed decisions and streamline operations in the PVF industry.
| ASME/ANSI B16.5 Flanges and Bolts Dimensions - Class 150 | |||||
| Nominal Pipe Size NPS (Inches) | Class 150 | ||||
| Outside Diameter of Flange (Inches) | No. of Bolts | Diameter of Bolts (Inches) | Diameter of Bolt Holes (Inches) | Bolt Circle (Inches) | |
| 1/2" | 3.50 | 4 | 1/2" | 5/8" | 2.38 |
| 3/4" | 3.88 | 4 | 1/2" | 5/8" | 2.75 |
| 1" | 4.25 | 4 | 1/2" | 5/8" | 3.12 |
| 1-1/4" | 4.62 | 4 | 1/2" | 5/8" | 3.50 |
| 1-1/2" | 5.00 | 4 | 1/2" | 5/8" | 3.88 |
| 2" | 6.00 | 4 | 5/8" | 3/4" | 4.75 |
| 2-1/2" | 7.00 | 4 | 5/8" | 3/4" | 5.50 |
| 3" | 7.50 | 4 | 5/8" | 3/4" | 6.00 |
| 3-1/2" | 8.50 | 8 | 5/8" | 3/4" | 7.00 |
| 4" | 9.00 | 8 | 5/8" | 3/4" | 7.50 |
| 5" | 10.00 | 8 | 3/4" | 7/8" | 8.50 |
| 6" | 11.00 | 8 | 3/4" | 7/8" | 9.50 |
| 8" | 13.50 | 8 | 3/4" | 7/8" | 11.75 |
| 10" | 16.00 | 12 | 7/8" | 1" | 14.25 |
| 12" | 19.00 | 12 | 7/8" | 1" | 17.00 |
| 14" | 21.00 | 12 | 1" | 1-1/8" | 18.75 |
| 16" | 23.50 | 16 | 1" | 1-1/8" | 21.25 |
| 18" | 25.00 | 16 | 1-1/8" | 1-1/4" | 22.75 |
| 20" | 27.50 | 20 | 1-1/8" | 1-1/4" | 25.00 |
| 24" | 32.00 | 20 | 1-1/4" | 1-3/8" | 29.50 |
NOTE: 1 inch = 25.4mm
| ASME/ANSI B16.5 Flanges and Bolts Dimensions - Class 300 | |||||
| Nominal Pipe Size NPS (Inches) | Class 300 | ||||
| Diameter of Flange (Inches) | No. of Bolts | Diameter of Bolts (Inches) | Diameter of Bolt Holes (Inches) | Bolt Circle (Inches) | |
| 1/2" | 3.75 | 4 | 1/2" | 5/8" | 2.62 |
| 3/4" | 4.62 | 4 | 5/8" | 3/4" | 3.25 |
| 1" | 4.88 | 4 | 5/8" | 3/4" | 3.50 |
| 1-1/4" | 5.25 | 4 | 5/8" | 3/4" | 3.88 |
| 1-1/2" | 6.12 | 4 | 3/4" | 7/8" | 4.50 |
| 2" | 6.50 | 8 | 5/8" | 3/4" | 5.00 |
| 2-1/2" | 7.50 | 8 | 3/4" | 7/8" | 5.88 |
| 3" | 8.25 | 8 | 3/4" | 7/8" | 6.62 |
| 3-1/2" | 9.00 | 8 | 3/4" | 7/8" | 7.25 |
| 4" | 10.00 | 8 | 3/4" | 7/8" | 7.88 |
| 5" | 11.00 | 8 | 3/4" | 7/8" | 9.25 |
| 6" | 12.50 | 12 | 3/4" | 7/8" | 10.62 |
| 8" | 15.00 | 12 | 7/8" | 1" | 13.00 |
| 10" | 17.50 | 16 | 1" | 1-1/8" | 15.25 |
| 12" | 20.50 | 16 | 1-1/8" | 1-1/4" | 17.75 |
| 14" | 23.00 | 20 | 1-1/8" | 1-1/4" | 20.24 |
| 16" | 25.50 | 20 | 1-1/4" | 1-3/8" | 22.50 |
| 18" | 28.00 | 24 | 1-1/4" | 1-3/8" | 24.74 |
| 20" | 30.50 | 24 | 1-1/4" | 1-3/8" | 27.00 |
| 24" | 36.00 | 24 | 1-1/2" | 1-5/8" | 32.00 |
