SS Flange Standard Dimensions Chart in mm & PDF
Check Flange Dimensions Chart in MM of Class 150, Flange Class 300, Flange Class 600, Class 900 Flange, Class 1500 Flange, Class 2500 Flange Dimensions.
Flange Dimensions Chart & Standards
Selecting the right flange is essential for ensuring leak-proof, reliable piping performance. All the critical measurements in our SS Flange dimension charts are in millimetres (mm) to enable the engineer, fabricator, and the buyer to make the right choice on the size to be used. We offer description of all standard flanges of steel, Class 150, Table H, and even dimensions of well-known nominal pipe sizes such as 4-inch flanges. You Can Whatsapp us your query at +91 96642 18138.
| Flange Type | Standard | Nominal Pipe Size (NPS) | Outer Diameter (OD) | Bolt Circle Diameter (BCD) | Number of Bolts | Bolt Hole Diameter |
|---|---|---|---|---|---|---|
| Weld Neck | ANSI | 2” | 6.00” | 4.75” | 4 | 0.75” |
| Slip On | ANSI | 3” | 7.50” | 6.00” | 4 | 0.88” |
| Blind | DIN | 4” | 9.00” | 7.50” | 8 | 0.75” |
| Socket Weld | ANSI | 6” | 11.00” | 9.50” | 8 | 0.88” |
| Lap Joint | JIS | 8” | 13.50” | 11.75” | 8 | 1.00” |
| Threaded | ANSI | 1” | 4.50” | 3.50” | 4 | 0.50” |
| Raised Face | ANSI | 3” | 7.50” | 6.00” | 4 | 0.88” |
| Flat Face | ANSI | 4” | 9.00” | 7.50” | 8 | 0.75” |
Class 150 Flange Dimensions (in mm)
One of the most popular pressure rating used in industrial piping is Class 150 flanges. We have mentioned our dimension chart with outside diameter, bolt circle diameter, number of bolts, flange thickness and bore sizes in a clear table in millimetre so that this can be readily accessed.
| NOMINAL SIZE | DIMENSIONS | WEIGHT (KG) | ||||
|---|---|---|---|---|---|---|
| NPS (Inches) |
DN (mm) | FLANGE MM |
FLANGE THICKNESS |
SOW SW |
WN | BLIND |
| 1/2 | 15 | 88.9 | 11.2 | 0.4 | 0.5 | 0.4 |
| 3/4 | 20 | 98.6 | 12.7 | 0.6 | 0.7 | 0.6 |
| 1 | 25 | 108 | 14.2 | 0.8 | 1 | 0.9 |
| 1 1/4 | 32 | 117.3 | 15.7 | 1 | 1.3 | 1.2 |
| 1 1/2 | 40 | 127 | 17.5 | 1.3 | 1.7 | 1.5 |
| 2 | 50 | 152.4 | 19.1 | 2.1 | 2.6 | 2.4 |
| 2 1/2 | 65 | 177.8 | 22.4 | 3.3 | 4.1 | 3.9 |
| 3 | 80 | 190.5 | 23.9 | 3.9 | 4.9 | 4.9 |
| 3 1/2 | 90 | 215.9 | 23.9 | 4.8 | 6.1 | 6.2 |
| 4 | 100 | 228.6 | 23.9 | 5.3 | 6.8 | 7.0 |
| 5 | 125 | 254 | 23.9 | 6.1 | 8.6 | 8.6 |
| 6 | 150 | 279.4 | 25.4 | 7.5 | 10.6 | 11.3 |
| 8 | 200 | 342.9 | 28.4 | 12.1 | 17.6 | 19.6 |
| 10 | 250 | 406.4 | 30.2 | 16.5 | 24 | 28.6 |
| 12 | 300 | 482.6 | 31.8 | 26.2 | 36.5 | 43.2 |
| 14 | 350 | 533.4 | 35.1 | 34.6 | 48.4 | 58.1 |
| 16 | 400 | 596.9 | 36.6 | 44.8 | 60.6 | 76.1 |
| 18 | 450 | 635 | 39.6 | 48.9 | 68.3 | 93.7 |
| 20 | 500 | 698.5 | 42.9 | 61.9 | 84.5 | 122.0 |
| 24 | 600 | 812.8 | 47.8 | 86.9 | 115 | 185.0 |
Table H Flange Dimensions
Table H flanges which are inhibited in higher pressure applications are usually exact measurement and safe to install. Our mm dimension chart involves the thickness, bolt spacing, pitch circle diameter, and bore sizes according to the accepted engineering standards.
| Nominal | Dia. of Flange | I.D. of Flange | Dia. of Bolt Circle | No. of | Dia. of Bolt | Thickness |
| Pipe Size | D | d5 | k | Holes | d2 | b |
| 1/2″ | 3.3/4″ | 7/8″ | 2.5/8″ | 4 | 1/2″ | 3/8″ |
| 3/4″ | 4″ | 1.3/32″ | 2.7/8″ | 4 | 1/2″ | 3/8″ |
| 1″ | 4.3/4″ | 1.23/64″ | 3.7/16″ | 4 | 5/8″ | 3/8″ |
| 1.1/4″ | 5.1/4″ | 1.45/64″ | 3.7/8″ | 4 | 5/8″ | 1/2″ |
| 1.1/2″ | 5.1/2″ | 1.15/16″ | 4.1/8″ | 4 | 5/8″ | 1/2″ |
| 2″ | 6.1/2″ | 2.7/16″ | 5″ | 4 | 5/8″ | 5/8″ |
| 2.1/2 | 7.1/4″ | 2.15/16″ | 5.3/4″ | 8 | 5/8″ | 5/8″ |
| 3″ | 8″ | 3.37/64″ | 6.1/2″ | 8 | 5/8″ | 5/8″ |
| 3.1/2″ | 8.1/2″ | 4.5/64″ | 7″ | 8 | 5/8″ | 3/4″ |
| 4″ | 9″ | 4.37/64″ | 7.1/2″ | 8 | 5/8″ | 3/4″ |
| 5″ | 11″ | 5.43/64″ | 9.1/4″ | 8 | 3/4″ | 7/8″ |
| 6″ | 12″ | 6.23/32″ | 10.1/4″ | 12 | 3/4″ | 7/8″ |
| 7″ | 13.1/4″ | 7.5/8″ | 11.1/2″ | 12 | 3/4″ | 7/8″ |
| 8′ | 14.1/2″ | 8.23/32″ | 12.3/4″ | 12 | 3/4″ | 1″ |
| 9″ | 16″ | 9.23/32″ | 14″ | 12 | 7/8″ | 1″ |
| 10″ | 17″ | 10.7/8″ | 15″ | 12 | 7/8″ | 1″ |
| 12″ | 19.1/4″ | 12.7/8″ | 17.1/4″ | 16 | 7/8″ | 1/1/8″ |
| 14″ | 21.3/4″ | 14.9/64″ | 19.1/2″ | 16 | 1″ | 1.1/4″ |
| 16″ | 24″ | 16.5/32″ | 21.3/4″ | 20 | 1″ | 1.1/4″ |
| 18″ | 26.1/2″ | 18.3/16″ | 24″ | 20 | 1.1/8″ | 1.3/8″ |
| 20″ | 29″ | 20.13/16″ | 26.1/2″ | 24 | 1.1/8″ | 1.1/2″ |
| 24″ | 33.1/2″ | 24.1/4″ | 30.3/4″ | 24 | 1.1/4″ | 1.5/8″ |
4-Inch Flange Dimensions
The 4-inch (100 mm nominal bore) size of the flange is common in pipelines. We also offer a special dimension reference of 4-inch flanges in various classes of pressure in order to help you check specifications fast during layout or purchase.