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.

flange bolt dimension chart

Class 150 Pipe Flange Bolt Charts

Size in InchSize in mmNo of BoltsBolt Size UNCRF Stud LengthISO Stud SizeMachine Bolt Length
Class 150 Flange
1/21541/255M1450
3/42041/265M1450
12541/265M1455
1 1/43241/270M1455
1 1/24041/270M1465
25045/885M1670
2 1/26545/890M1675
38045/890M1675
3 1/29085/890M1675
410085/890M1675
512583/495M2085
615083/4100M2085
820083/4110M2090
10250127/8115M24100
12300127/8120M24100
14350121135M27115
16400161135M27115
18450161 1/8145M30125
20500201 1/8160M30140
24600201 1/4170M33150
Piping Courses

Class 300 Flange Bolt Charts

Size in InchSize in mmNo of BoltsBolt Size UNCRF Stud LengthISO Stud SizeMachine Bolt Length
Class 300 Flange
1/21541/265M1455
3/42045/875M1665
12545/875M1665
1 1/43245/885M1670
1 1/24043/490M2075
25085/890M1675
2 1/26583/4100M2085
38083/4110M2090
3 1/29083/4110M2095
410083/4115M2095
512583/4120M20110
6150123/4120M20110
8200127/8140M24120
10250161160M27140
12300161 1/8170M30145
14350201 1/8180M30160
16400201 1/4190M33165
18450241 1/4195M33170
20500241 1/4205M33185
24600241 1/2230M39205

Class 400 Flange Bolt and Stud Dimension Chart

Size in InchSize in mmNo of BoltsBolt Size UNCRF Stud LengthISO Stud Size
Class 400 Flange
1/21541/275M14
3/42045/890M16
12545/890M16
1 1/43245/895M16
1 1/24043/4110M20
25085/8110M16
2 1/26583/4120M20
38083/4125M20
3 1/29087/8140M24
410087/8140M24
512587/8145M24
6150127/8150M24
8200121170M27
10250161 1/8190M30
12300161 1/4205M33
14350201 1/4210M33
16400201 3/8220M36
18450241 3/8230M36
20500241 1/2240M39
24600241 3/4265M45

Bolt Charts for Class # 600 Flanges

Size in InchSize in mmNo of BoltsBolt Size UNCRF Stud LengthISO Stud Size
Class 600 Flange
1/21541/275M14
3/42045/890M16
12545/890M16
1 1/43245/895M16
1 1/24043/4110M20
25085/8110M16
2 1/26583/4120M20
38083/4125M20
3 1/29087/8140M24
410087/8145M24
512581165M27
6150121170M27
8200121 1/8190M30
10250161 1/4215M33
12300201 1/4220M33
14350201 3/8235M36
16400201 1/2255M39
18450201 5/8275M42
20500241 5/8285M42
24600241 7/8330M48

Class 900 Flange Bolt Charts

Size in InchSize in mmNo of BoltsBolt Size UNCRF Stud LengthISO Stud Size
Class 900 Flange
1/21543/4110M20
3/42043/4115M20
12547/8125M24
1 1/43247/8125M24
1 1/24041140M27
25087/8145M24
2 1/26581160M27
38087/8145M24
410081 1/8170M30
512581 1/4190M33
6150121 1/8190M30
8200121 3/8220M36
10250161 3/8235M36
12300201 3/8255M36
14350201 1/2275M39
16400201 5/8285M42
18450201 7/8325M48
20500202350M52
24600202 1/2440M64

Class 1500 Bolt and stud Charts

Size in InchSize in mmNo of BoltsBolt Size UNCRF Stud LengthISO Stud Size
Class 1500 Flange
1/21543/4110M20
3/42043/4115M20
12547/8125M24
1 1/43247/8125M24
1 1/24041140M27
25087/8145M24
2 1/26581160M27
38081 1/8180M30
410081 1/4195M33
512581 1/2250M39
6150121 3/8260M36
8200121 5/8290M42
10250121 7/8335M48
12300162375M52
14350162 1/4405M56
16400162 1/2445M64
18450162 3/4495M72
20500163540M76
24600163 1/2615M90

Class 2500 Stud and Bolt Dimensions Charts

Size in InchSize in mmNo of BoltsBolt Size UNCRF Stud LengthISO Stud Size
Class 2500 Flange
1/21543/4120M20
3/42043/4125M20
12547/8140M24
1 1/43241150M27
1 1/24041 1/8170M30
25081180M27
2 1/26581 1/8195M30
38081 1/4220M33
410081 1/2255M39
512581 3/4300M45
615082345M52
8200122380M52
10250122 1/2490M64
12300122 3/4540M72

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