ANSI / ASME B16.5 Class 400 Lap Joint Flange Dimensions
Lap Joint flanges are commonly used in low-pressure, non-corrosive medium systems, such as in industries like food processing, pharmaceuticals, and water treatment.
ANSI / ASME B16.5 Class 400 Lap Joint Flange
Class 400 Lap Joint Flange Dimensions in Inch/lbs
Class 400 Lap Joint Flange Dimensions in mm/kg
Class 400 Lap Joint Flange Dimensions in Inch/lbs
| Nominal Pipe Size | Outside Diameter (O) | Thickness (T) | Length Thru Hub (Y) | Hub Diameter (X) | Radius (r) | Bore (B) | Approximate Weight (lbs) | Bolt Circle (C) | Number of Holes | Diameter of Holes |
| 1/2 | 3.75 | 0.56 | 1.38 | 0.88 | 0.13 | 0.90 | 2 | 2.63 | 4 | 0.63 |
| 3/4 | 4.63 | 0.63 | 1.69 | 1.00 | 0.13 | 1.11 | 3 | 3.25 | 4 | 0.75 |
| 1 | 4.88 | 0.69 | 2.00 | 1.06 | 0.13 | 1.38 | 4 | 3.50 | 4 | 0.75 |
| 1 1/4 | 5.25 | 0.81 | 2.50 | 1.13 | 0.19 | 1.72 | 5 | 3.88 | 4 | 0.75 |
| 1 1/2 | 6.13 | 0.88 | 2.88 | 1.25 | 0.25 | 1.97 | 7 | 4.50 | 4 | 0.88 |
| 2 | 6.50 | 1.00 | 3.63 | 1.44 | 0.31 | 2.46 | 9 | 5.00 | 8 | 0.75 |
| 2 1/2 | 7.50 | 1.13 | 4.13 | 1.63 | 0.31 | 2.97 | 12 | 5.88 | 8 | 0.88 |
| 3 | 8.25 | 1.25 | 5.00 | 1.81 | 0.38 | 3.60 | 15 | 6.63 | 8 | 0.88 |
| 3 1/2 | 9.00 | 1.38 | 5.50 | 1.94 | 0.38 | 4.10 | 20 | 7.25 | 8 | 1.00 |
| 4 | 10.00 | 1.38 | 2.00 | 5.75 | 0.44 | 4.60 | 25 | 7.88 | 8 | 1.00 |
| 5 | 11.00 | 1.50 | 2.13 | 7.00 | 0.44 | 5.69 | 29 | 9.25 | 8 | 1.00 |
| 6 | 12.50 | 1.63 | 2.25 | 8.13 | 0.50 | 6.75 | 42 | 10.63 | 12 | 1.00 |
| 8 | 15.00 | 1.88 | 2.69 | 10.25 | 0.50 | 8.75 | 64 | 13.00 | 12 | 1.13 |
| 10 | 17.50 | 2.13 | 4.00 | 12.63 | 0.50 | 10.92 | 110 | 15.25 | 16 | 1.25 |
| 12 | 20.50 | 2.25 | 4.25 | 14.75 | 0.50 | 12.92 | 150 | 17.75 | 16 | 1.38 |
| 14 | 23.00 | 2.38 | 4.63 | 16.75 | 0.50 | 14.18 | 205 | 20.25 | 20 | 1.38 |
| 16 | 25.50 | 2.50 | 5.00 | 19.00 | 0.50 | 16.19 | 260 | 22.50 | 20 | 1.50 |
| 18 | 28.00 | 2.63 | 5.38 | 21.00 | 0.50 | 18.20 | 315 | 24.75 | 24 | 1.50 |
| 20 | 30.50 | 2.75 | 5.75 | 23.13 | 0.50 | 20.25 | 385 | 27.00 | 24 | 1.63 |
| 22 | 33.00 | 2.88 | 6.00 | 25.25 | 0.50 | 22.25 | 455 | 29.25 | 24 | 1.75 |
| 24 | 36.00 | 3.00 | 6.25 | 27.63 | 0.50 | 24.25 | 570 | 32.00 | 24 | 1.88 |
Class 400 Lap Joint Flange Dimensions in mm/kg
| Nominal Pipe Size | Outside Diameter (O) | Thickness (T) | Length Thru Hub (Y) | Hub Diameter (X) | Radius (r) | Bore (B) | Approximate Weight (lbs) | Bolt Circle (C) | Number of Holes | Diameter of Holes |
| 1/2 | 95.25 | 14.22 | 35.05 | 22.35 | 3.30 | 22.86 | 0.91 | 66.80 | 4 | 16.00 |
| 3/4 | 117.60 | 16.00 | 42.93 | 25.40 | 3.30 | 28.19 | 1.36 | 82.55 | 4 | 19.05 |
| 1 | 123.95 | 17.53 | 50.80 | 26.92 | 3.30 | 35.05 | 1.81 | 88.90 | 4 | 19.05 |
| 1 1/4 | 133.35 | 20.57 | 63.50 | 28.70 | 4.83 | 43.69 | 2.27 | 98.55 | 4 | 19.05 |
| 1 1/2 | 155.70 | 22.35 | 73.15 | 31.75 | 6.35 | 50.04 | 3.18 | 114.30 | 4 | 22.35 |
| 2 | 165.10 | 25.40 | 92.20 | 36.58 | 7.87 | 62.48 | 4.08 | 127.00 | 8 | 19.05 |
| 2 1/2 | 190.50 | 28.70 | 104.90 | 41.40 | 7.87 | 75.44 | 5.44 | 149.35 | 8 | 22.35 |
| 3 | 209.55 | 31.75 | 127.00 | 45.97 | 9.65 | 91.44 | 6.80 | 168.40 | 8 | 22.35 |
| 3 1/2 | 228.60 | 35.05 | 139.70 | 49.28 | 9.65 | 104.14 | 9.07 | 184.15 | 8 | 25.40 |
| 4 | 254.00 | 35.05 | 50.80 | 146.05 | 11.18 | 116.84 | 11.34 | 200.15 | 8 | 25.40 |
| 5 | 279.40 | 38.10 | 54.10 | 177.80 | 11.18 | 144.53 | 13.15 | 234.95 | 8 | 25.40 |
| 6 | 317.50 | 41.40 | 57.15 | 206.50 | 12.70 | 171.45 | 19.05 | 270.00 | 12 | 25.40 |
| 8 | 381.00 | 47.75 | 68.33 | 260.35 | 12.70 | 222.25 | 29.03 | 330.20 | 12 | 28.70 |
| 10 | 444.50 | 54.10 | 101.60 | 320.80 | 12.70 | 277.37 | 49.89 | 387.35 | 16 | 31.75 |
| 12 | 520.70 | 57.15 | 107.95 | 374.65 | 12.70 | 328.17 | 68.04 | 450.85 | 16 | 35.05 |
| 14 | 584.20 | 60.45 | 117.60 | 425.45 | 12.70 | 360.17 | 92.99 | 514.35 | 20 | 35.05 |
| 16 | 647.70 | 63.50 | 127.00 | 482.60 | 12.70 | 411.23 | 117.93 | 571.50 | 20 | 38.10 |
| 18 | 711.20 | 66.80 | 136.65 | 533.40 | 12.70 | 462.28 | 142.88 | 628.65 | 24 | 38.10 |
| 20 | 774.70 | 69.85 | 146.05 | 587.50 | 12.70 | 514.35 | 174.63 | 685.80 | 24 | 41.40 |
| 22 | 838.20 | 73.15 | 152.40 | 641.35 | 12.70 | 565.15 | 206.38 | 742.95 | 24 | 44.45 |
| 24 | 914.40 | 76.20 | 158.75 | 701.80 | 12.70 | 615.95 | 258.55 | 812.80 | 24 | 47.75 |
ANSI / ASME B16.5 Class 300 Lap Joint Flange is a type of flange that conforms to the ANSI/ASME B16.5 standard, designed for pipelines requiring a pressure rating of Class 400. It uses a “lap joint” design, where the flange is not directly welded to the pipe but is instead used with a Stub End that is welded to the pipe. The flange can rotate freely around the pipe, making alignment easier.
For more technical support, please contact SSM.
FAQ
- Common materials include:
- Carbon steel
- Stainless steel
- Alloy steel
- Other materials depending on the application (e.g., corrosion resistance or high-temperature needs).
- They are not recommended for extremely high-pressure or high-vibration environments.
- The Stub End must be welded to the pipe, which adds an extra step to the installation process.
- Not ideal for systems requiring a fully welded connection.
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