Number And Size of Bolts For Flanged Joints - ASME B16.5

Primary Service Pressure Rating

Bolting

 

Flange Facing

 
NOMINAL PIPE SIZE
1/2 3/4 1 2 3 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    ½ ½ ½ ½ ½ 5/8  5/8  5/8 5/8 5/8  ¾ ¾ ¾ 7/8  7/8  1 1 1⅛ 1⅛
Length of Stud Bolts  1/16" RF  4 5 1/4  5 1/4 

RTJ

 
    3 4 4 4 4 5
Lth Mach Bolts  1/16" RF  2 2 3 3 3 3 3 1/4  3 1/4  4 4 5 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    ½ 5/8  5/8  5/8  ¾ 5/8  ¾ ¾ ¾ ¾ ¾ ¾ 7/8  1 1  1 
Length of Stud Bolts  1/16" RF  3 3 4 4 3/4  7 8 9

RTJ

 
3 4 4 4 1/2  5 5 6 8 10
Lth Mach Bolts  1/16" RF  3 3 8
Ring No.    R11 R15 R16 R18 R20 R23 R26 R31 R34 R37 R41 R45 R49 R53 R57 R61 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    ½ 5/8  5/8  5/8  ¾ 5/8  ¾ ¾ 7/8  7/8  7/8  7/8  1 1  1  1 
Length of Stud Bolts  ¼" RF 3 5 6 8 9 10½

M&F T&G

 
3 1/2  4 4 8 10¼
RTJ 3 5 6 7 1/2  8 9 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    ½ 5/8  5/8  5/8  ¾ 5/8  ¾ ¾ 7/8  7/8  1 1 1  1  1 5/8  1 5/8  1 7/8 
Length of Stud Bolts  ¼" RF 3 5 10 10¾ 11¼ 13

M&F T&G

 
4 4 9 10½ 11 12¾
RTJ 3 5 10 10¾ 11½ 13¼
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    ¾ ¾ 7/8  7/8  1 7/8  1 7/8    1  1  1  1  1  1 5/8  1 7/8  2
Length of Stud Bolts  ¼" RF 5 5   10 10¾ 11¼ 12¾ 13¾ 17¼

M&F T&G

 
4 6   9 10½ 11 12½ 13½ 17
RTJ 5 5   10 11 11½ 13¼ 14¼ 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    ¾ ¾ 7/8  7/8  1 7/8  1 1    1  1  1  2 3
Length of Stud Bolts  ¼" RF 5 5 7   10 1/4  11½ 13 1/4  14¾ 16 17½ 19½ 21¼ 24¼

M&F T&G

 
4 6   10 11¼ 13 14½ 15¾ 17¼ 19¼ 21 24
RTJ 5 5 7   10½ 12¾ 13½ 15¼ 16¾ 18½ 20¾ 22¼ 25½
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    ¾ ¾ 7/8  1 1  1 1    2 2          
Length of Stud Bolts  ¼" RF 5 6 7   10 11¾ 13½ 15 19¼ 21¼          

M&F T&G

 
  11½ 13¼ 14¾ 19 21          
RTJ 5 6 7 8 9   10¼ 12¼ 14 15½ 20 22          
Ring No.    R13 R16 R18 R21 R23 R26 R28 R32   R38 R42 R47 R51 R55 R60          

Stud-Bolt lengths do not include the height of the points.
Lengths of studs and bolts, when used with lap joints flanges, are dependent upon the thickness of the lap of the stud end.



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