In this article, I have covered Flange Bolt Dimension Chart and Stud Size Dimensions 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 |