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Number & Size of Bolts for Flanged Joints
 

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Primary Service Pressure Rating Bolting Flange Facing Nominal Pipe Size
1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 3 1/2 4 5 6 8 10 12 14 16 18 20 24
Class 150 Number   4 4 4 4 4 4 4 4 8 8 8 8 8 12 12 12 16 16 20 20
Diameter   1/2 1/2 1/2 1/2 1/2 5/8 5/8 5/8 5/8 5/8 3/4 3/4 3/4 7/8 7/8 1 1 1 1/8 1 1/8 1 1/4
Length of Stud Bolts 1/16" RF 2 1/4 2 1/2 2 1/2 2 3/4 2 3/4 3 1/4 3 1/2 3 1/2 3 1/2 3 1/2 3 3/4 4 4 1/4 4 1/2 4 3/4 5 1/4 5 1/4 5 3/4 6 1/4 6 3/4
RTJ     3 3 1/4 3 1/4 3 3/4 4 4 4 4 4 1/4 4 1/2 4 3/4 5 5 1/4 5 3/4 5 3/4 6 1/4 6 3/4 7 1/4
Length of Mach. Bolts 1/16" RF 2 2 2 1/4 2 1/4 2 1/2 2 3/4 3 3 3 3 3 1/4 3 1/4 3 1/2 4 4 4 1/2 4 1/2 5 5 1/2 6
Ring No.       R15 R17 R19 R22 R25 R29 R33 R36 R40 R43 R48 R52 R56 R59 R64 R68 R72 R76
Class 300 Number   4 4 4 4 4 8 8 8 8 8 8 12 12 16 16 20 20 24 24 24
Diameter   1/2 5/8 5/8 5/8 3/4 5/8 3/4 3/4 3/4 3/4 3/4 3/4 7/8 1 1 1/8 1 1/8 1 1/4 1 1/4 1 1/4 1 1/2
Length of Stud Bolts 1/16" RF 2 1/2 3 3 3 1/4 3 1/2 3 1/2 4 4 1/4 4 1/4 4 1/2 4 3/4 4 3/4 5 1/2 6 1/4 6 3/4 7 7 1/2 7 3/4 8 9
RTJ 3 3 1/2 3 1/2 3 3/4 4 4 4 1/2 4 3/4 5 5 5 1/4 5 1/2 6 6 3/4 7 1/4 7 1/2 8 8 1/4 8 3/4 10
Length of Mach. Bolts 1/16" RF 2 1/4 2 1/2 2 1/2 2 3/4 3 3 3 1/4 3 1/2 3 3/4 3 3/4 4 1/4 4 1/4 4 3/4 5 1/2 5 3/4 6 1/4 6 1/2 6 3/4 7 1/4 8
Ring No.   R11 R13 R16 R18 R20 R23 R26 R31 R34 R37 R41 R45 R49 R53 R57 561 R65 R69 R73 R77
Class 400 Number   4 4 4 4 4 8 8 8 8 8 8 12 12 16 16 20 20 24 24 24
Diameter   1/2 5/8 5/8 5/8 3/4 5/8 3/4 3/4 7/8 7/8 7/8 7/8 1 1 1/8 1 1/4 1 1/4 1 3/8 1 3/8 1 1/2 1 3/4
Length of Stud Bolts 1/4" RF 3 3 1/2 3 1/2 3 3/4 4 1/4 4 1/4 4 3/4 5 5 1/2 5 1/2 5 3/4 6 6 3/4 7 1/2 8 8 1/4 8 3/4 9 9 1/2 10 1/2
M&F
T&G
2 3/4 3 1/4 3 1/4 3 1/2 4 4 4 1/2 4 3/4 5 1/4 5 1/4 5 1/4 5 3/4 6 1/2 7 1/4 7 3/4 8 8 1/2 8 3/4 9 1/4 10 1/4
RTJ 3 3 1/2 3 1/2 3 3/4 4 1/4 4 1/4 4 3/4 5 5 1/2 5 1/2 5 3/4 6 6 3/4 7 1/2 8 8 1/4 8 3/4 9 9 3/4 11
Ring No.   R11 R13 R16 R18 R20 R23 R26 R31 R34 R37 R41 R45 R49 R53 R57 R61 R65 R69 R73 R77
Class 600 Number   4 4 4 4 4 8 8 8 8 8 8 12 12 16 20 20 20 20 24 24
Diameter   1/2 8-May 5/8 5/8 3/4 5/8 3/4 3/4 7/8 7/8 1 1 1 1/8 1 1/4 1 1/4 1 3/8 1 1/2 1 5/8 1 5/8 1 7/8
Length of Stud Bolts 1/4" RF 3 3 1/2 3 1/2 3 3/4 4 1/4 4 1/4 4 3/4 5 5 1/2 5 3/4 6 1/2 6 3/4 7 1/2 8 1/2 8 3/4 9 1/4 10 10 3/4 11 1/4 13
M&F
T&G
2 3/4 3 1/4 3 1/4 3 1/2 4 4 4 1/2 4 3/4 5 1/4 5 1/2 6 1/4 6 1/2 7 1/4 8 1/4 8 1/2 9 9 3/4 10 1/2 11 12 3/4
RTJ 3 3 1/2 3 1/2 3 3/4 4 1/4 4 1/4 4 3/4 5 5 1/2 5 3/4 6 1/2 6 3/4 7 3/4 8 1/2 8 3/4 9 1/4 10 10 3/4 11 1/2 13 1/4
Ring No.   R11 R13 R16 R18 R20 R23 R26 R31 R34 R37 R41 R45 R49 R53 R57 R61 R65 R69 R73 R77
Class 900 Number   4 4 4 4 4 8 8 8   8 8 12 12 16 20 20 20 20 20 20
Diameter   3/4 3/4 7/8 7/8 1 7/8 1 7/8   1 1/8 1 1/4 1 1/8 1 3/8 1 3/8 1 3/8 1 1/2 1 5/8 1 7/8 2 2 1/2
Length of Stud Bolts 1/4" RF 4 1/4 4 1/2 5 5 5 1/2 5 3/4 6 1/4 5 3/4   6 3/4 7 1/2 7 1/2 8 3/4 9 1/4 10 10 3/4 11 1/4 12 3/4 13 3/4 17 1/4
M&F
T&G
4 4 1/4 4 3/4 4 3/4 5 1/4 5 1/2 6 5 1/2   6 1/2 7 1/4 7 1/4 8 1/2 9 9 3/4 10 1/2 11 12 1/2 13 1/2 17
RTJ 4 1/4 4 1/2 5 5 5 1/2 5 3/4 6 1/4 5 3/4   6 3/4 7 1/2 7 3/4 8 3/4 9 1/4 10 11 11 1/2 13 1/4 14 1/4 18
Ring No.   R12 R14 R16 R18 R20 R24 R27 R31   R37 R41 R45 R49 R53 R57 R62 R66 R70 R74 R78
Class 1500 Number   4 4 4 4 4 8 8 8   8 8 12 12 12 16 16 16 16 16 16
Diameter   3/4 3/4 7/8 7/8 1 7/8 1 1 1/8   1 1/4 1 1/2 1 3/8 1 5/8 1 7/8 2 2 1/4 2 1/2 2 3/4 3 3 1/2
Length of Stud Bolts 1/4" RF 4 1/4 4 1/2 5 5 5 1/2 5 3/4 6 1/4 7   7 3/4 9 3/4 10 1/4 11 1/2 13 1/4 14 3/4 16 17 1/2 19 1/2 21 1/4 24 1/4
M&F
T&G
4 4 1/4 4 3/4 4 3/4 5 1/4 5 1/2 6 6 3/4   7 1/2 9 1/2 10 11 1/4 13 14 1/2 15 3/4 17 1/4 19 1/4 21 24
RTJ 4 1/4 4 1/2 5 5 5 1/2 5 3/4 6 1/4 7   7 3/4 9 3/4 10 1/2 12 3/4 13 1/2 15 1/4 16 3/4 18 1/2 20 3/4 22 1/4 25 1/2
Ring No.   R12 R14 R16 R18 R20 R24 R27 R35   R39 R44 R46 R50 R54 R58 R63 R67 R71 R75 R79
Class 2500 Number   4 4 4 4 4 8 8 8   8 8 8 12 12 12          
Diameter   3/4 3/4 7/8 1 1 1/8 1 1 1/8 1 1/4   1 1/2 1 3/4 2 2 2 1/2 2 3/4          
Length of Stud Bolts 1/4" RF 4 3/4 5 5 1/2 6 6 3/4 7 7 3/4 8 3/4   10 11 3/4 13 1/2 15 19 1/4 21 1/4          
M&F
T&G
4 1/2 4 3/4 5 1/4 5 3/4 6 1/2 6 3/4 7 1/2 8 1/2   9 3/4 11 1/2 13 1/4 14 3/4 19 21          
RTJ 4 3/4 5 5 1/2 6 6 3/4 7 8 9   10 1/4 12 1/4 14 15 1/2 20 22          
Ring No.   R13 R16 R18 R21 R23 R26 R28 R32   R38 R42 R47 R51 R55 R60