In this article, I have covered Flange Bolt Dimension Chart and Stud Size Dim#sions for stud and bolt used is piping. Diameter and Lengths of the stud and bolt are covered in flange standard ASME B16.5 & B16.47. as you are going to use bolt and stud to connect flanges.
Image shown below indicates the nomenclature that used in the dimension chart.
Class 150 Pipe Flange Bolt Charts
| Size in Inch | Size in mm | No of Bolts | Bolt Size UNC | RF Stud Length | ISO Stud Size | Machine Bolt Length |
|---|
| Class 150 Flange |
| 1/2 | 15 | 4 | 1/2 | 55 | M14 | 50 |
| 3/4 | 20 | 4 | 1/2 | 65 | M14 | 50 |
| 1 | 25 | 4 | 1/2 | 65 | M14 | 55 |
| 1 1/4 | 32 | 4 | 1/2 | 70 | M14 | 55 |
| 1 1/2 | 40 | 4 | 1/2 | 70 | M14 | 65 |
| 2 | 50 | 4 | 5/8 | 85 | M16 | 70 |
| 2 1/2 | 65 | 4 | 5/8 | 90 | M16 | 75 |
| 3 | 80 | 4 | 5/8 | 90 | M16 | 75 |
| 3 1/2 | 90 | 8 | 5/8 | 90 | M16 | 75 |
| 4 | 100 | 8 | 5/8 | 90 | M16 | 75 |
| 5 | 125 | 8 | 3/4 | 95 | M20 | 85 |
| 6 | 150 | 8 | 3/4 | 100 | M20 | 85 |
| 8 | 200 | 8 | 3/4 | 110 | M20 | 90 |
| 10 | 250 | 12 | 7/8 | 115 | M24 | 100 |
| 12 | 300 | 12 | 7/8 | 120 | M24 | 100 |
| 14 | 350 | 12 | 1 | 135 | M27 | 115 |
| 16 | 400 | 16 | 1 | 135 | M27 | 115 |
| 18 | 450 | 16 | 1 1/8 | 145 | M30 | 125 |
| 20 | 500 | 20 | 1 1/8 | 160 | M30 | 140 |
| 24 | 600 | 20 | 1 1/4 | 170 | M33 | 150 |
Class 300 Flange Bolt Charts
| Size in Inch | Size in mm | No of Bolts | Bolt Size UNC | RF Stud Length | ISO Stud Size | Machine Bolt Length |
|---|
| Class 300 Flange |
| 1/2 | 15 | 4 | 1/2 | 65 | M14 | 55 |
| 3/4 | 20 | 4 | 5/8 | 75 | M16 | 65 |
| 1 | 25 | 4 | 5/8 | 75 | M16 | 65 |
| 1 1/4 | 32 | 4 | 5/8 | 85 | M16 | 70 |
| 1 1/2 | 40 | 4 | 3/4 | 90 | M20 | 75 |
| 2 | 50 | 8 | 5/8 | 90 | M16 | 75 |
| 2 1/2 | 65 | 8 | 3/4 | 100 | M20 | 85 |
| 3 | 80 | 8 | 3/4 | 110 | M20 | 90 |
| 3 1/2 | 90 | 8 | 3/4 | 110 | M20 | 95 |
| 4 | 100 | 8 | 3/4 | 115 | M20 | 95 |
| 5 | 125 | 8 | 3/4 | 120 | M20 | 110 |
| 6 | 150 | 12 | 3/4 | 120 | M20 | 110 |
| 8 | 200 | 12 | 7/8 | 140 | M24 | 120 |
| 10 | 250 | 16 | 1 | 160 | M27 | 140 |
| 12 | 300 | 16 | 1 1/8 | 170 | M30 | 145 |
| 14 | 350 | 20 | 1 1/8 | 180 | M30 | 160 |
| 16 | 400 | 20 | 1 1/4 | 190 | M33 | 165 |
| 18 | 450 | 24 | 1 1/4 | 195 | M33 | 170 |
| 20 | 500 | 24 | 1 1/4 | 205 | M33 | 185 |
| 24 | 600 | 24 | 1 1/2 | 230 | M39 | 205 |
Class 400 Flange Bolt and Stud Dimension Chart
| Size in Inch | Size in mm | No of Bolts | Bolt Size UNC | RF Stud Length | ISO Stud Size |
|---|
| Class 400 Flange |
| 1/2 | 15 | 4 | 1/2 | 75 | M14 |
| 3/4 | 20 | 4 | 5/8 | 90 | M16 |
| 1 | 25 | 4 | 5/8 | 90 | M16 |
| 1 1/4 | 32 | 4 | 5/8 | 95 | M16 |
| 1 1/2 | 40 | 4 | 3/4 | 110 | M20 |
| 2 | 50 | 8 | 5/8 | 110 | M16 |
| 2 1/2 | 65 | 8 | 3/4 | 120 | M20 |
| 3 | 80 | 8 | 3/4 | 125 | M20 |
| 3 1/2 | 90 | 8 | 7/8 | 140 | M24 |
| 4 | 100 | 8 | 7/8 | 140 | M24 |
| 5 | 125 | 8 | 7/8 | 145 | M24 |
| 6 | 150 | 12 | 7/8 | 150 | M24 |
| 8 | 200 | 12 | 1 | 170 | M27 |
| 10 | 250 | 16 | 1 1/8 | 190 | M30 |
| 12 | 300 | 16 | 1 1/4 | 205 | M33 |
| 14 | 350 | 20 | 1 1/4 | 210 | M33 |
| 16 | 400 | 20 | 1 3/8 | 220 | M36 |
| 18 | 450 | 24 | 1 3/8 | 230 | M36 |
| 20 | 500 | 24 | 1 1/2 | 240 | M39 |
| 24 | 600 | 24 | 1 3/4 | 265 | M45 |
Bolt Charts for Class # 600 Flanges
| Size in Inch | Size in mm | No of Bolts | Bolt Size UNC | RF Stud Length | ISO Stud Size |
|---|
| Class 600 Flange |
| 1/2 | 15 | 4 | 1/2 | 75 | M14 |
| 3/4 | 20 | 4 | 5/8 | 90 | M16 |
| 1 | 25 | 4 | 5/8 | 90 | M16 |
| 1 1/4 | 32 | 4 | 5/8 | 95 | M16 |
| 1 1/2 | 40 | 4 | 3/4 | 110 | M20 |
| 2 | 50 | 8 | 5/8 | 110 | M16 |
| 2 1/2 | 65 | 8 | 3/4 | 120 | M20 |
| 3 | 80 | 8 | 3/4 | 125 | M20 |
| 3 1/2 | 90 | 8 | 7/8 | 140 | M24 |
| 4 | 100 | 8 | 7/8 | 145 | M24 |
| 5 | 125 | 8 | 1 | 165 | M27 |
| 6 | 150 | 12 | 1 | 170 | M27 |
| 8 | 200 | 12 | 1 1/8 | 190 | M30 |
| 10 | 250 | 16 | 1 1/4 | 215 | M33 |
| 12 | 300 | 20 | 1 1/4 | 220 | M33 |
| 14 | 350 | 20 | 1 3/8 | 235 | M36 |
| 16 | 400 | 20 | 1 1/2 | 255 | M39 |
| 18 | 450 | 20 | 1 5/8 | 275 | M42 |
| 20 | 500 | 24 | 1 5/8 | 285 | M42 |
| 24 | 600 | 24 | 1 7/8 | 330 | M48 |
Class 900 Flange Bolt Charts
| Size in Inch | Size in mm | No of Bolts | Bolt Size UNC | RF Stud Length | ISO Stud Size |
|---|
| Class 900 Flange |
| 1/2 | 15 | 4 | 3/4 | 110 | M20 |
| 3/4 | 20 | 4 | 3/4 | 115 | M20 |
| 1 | 25 | 4 | 7/8 | 125 | M24 |
| 1 1/4 | 32 | 4 | 7/8 | 125 | M24 |
| 1 1/2 | 40 | 4 | 1 | 140 | M27 |
| 2 | 50 | 8 | 7/8 | 145 | M24 |
| 2 1/2 | 65 | 8 | 1 | 160 | M27 |
| 3 | 80 | 8 | 7/8 | 145 | M24 |
| 4 | 100 | 8 | 1 1/8 | 170 | M30 |
| 5 | 125 | 8 | 1 1/4 | 190 | M33 |
| 6 | 150 | 12 | 1 1/8 | 190 | M30 |
| 8 | 200 | 12 | 1 3/8 | 220 | M36 |
| 10 | 250 | 16 | 1 3/8 | 235 | M36 |
| 12 | 300 | 20 | 1 3/8 | 255 | M36 |
| 14 | 350 | 20 | 1 1/2 | 275 | M39 |
| 16 | 400 | 20 | 1 5/8 | 285 | M42 |
| 18 | 450 | 20 | 1 7/8 | 325 | M48 |
| 20 | 500 | 20 | 2 | 350 | M52 |
| 24 | 600 | 20 | 2 1/2 | 440 | M64 |
Class 1500 Bolt and stud Charts
| Size in Inch | Size in mm | No of Bolts | Bolt Size UNC | RF Stud Length | ISO Stud Size |
|---|
| Class 1500 Flange |
| 1/2 | 15 | 4 | 3/4 | 110 | M20 |
| 3/4 | 20 | 4 | 3/4 | 115 | M20 |
| 1 | 25 | 4 | 7/8 | 125 | M24 |
| 1 1/4 | 32 | 4 | 7/8 | 125 | M24 |
| 1 1/2 | 40 | 4 | 1 | 140 | M27 |
| 2 | 50 | 8 | 7/8 | 145 | M24 |
| 2 1/2 | 65 | 8 | 1 | 160 | M27 |
| 3 | 80 | 8 | 1 1/8 | 180 | M30 |
| 4 | 100 | 8 | 1 1/4 | 195 | M33 |
| 5 | 125 | 8 | 1 1/2 | 250 | M39 |
| 6 | 150 | 12 | 1 3/8 | 260 | M36 |
| 8 | 200 | 12 | 1 5/8 | 290 | M42 |
| 10 | 250 | 12 | 1 7/8 | 335 | M48 |
| 12 | 300 | 16 | 2 | 375 | M52 |
| 14 | 350 | 16 | 2 1/4 | 405 | M56 |
| 16 | 400 | 16 | 2 1/2 | 445 | M64 |
| 18 | 450 | 16 | 2 3/4 | 495 | M72 |
| 20 | 500 | 16 | 3 | 540 | M76 |
| 24 | 600 | 16 | 3 1/2 | 615 | M90 |
Class 2500 Stud and Bolt Dimensions Charts
| Size in Inch | Size in mm | No of Bolts | Bolt Size UNC | RF Stud Length | ISO Stud Size |
|---|
| Class 2500 Flange |
| 1/2 | 15 | 4 | 3/4 | 120 | M20 |
| 3/4 | 20 | 4 | 3/4 | 125 | M20 |
| 1 | 25 | 4 | 7/8 | 140 | M24 |
| 1 1/4 | 32 | 4 | 1 | 150 | M27 |
| 1 1/2 | 40 | 4 | 1 1/8 | 170 | M30 |
| 2 | 50 | 8 | 1 | 180 | M27 |
| 2 1/2 | 65 | 8 | 1 1/8 | 195 | M30 |
| 3 | 80 | 8 | 1 1/4 | 220 | M33 |
| 4 | 100 | 8 | 1 1/2 | 255 | M39 |
| 5 | 125 | 8 | 1 3/4 | 300 | M45 |
| 6 | 150 | 8 | 2 | 345 | M52 |
| 8 | 200 | 12 | 2 | 380 | M52 |
| 10 | 250 | 12 | 2 1/2 | 490 | M64 |
| 12 | 300 | 12 | 2 3/4 | 540 | M72 |
