Number And Size of Bolts For Flanged Joints - ASME B16.5
Primary Service Pressure Rating |
Bolting |
Flange Facing |
NOMINAL PIPE SIZE |
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1/2" | 3/4" | 1" | 1¼" | 1½" | 2" | 2½" | 3" | 3½" | 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 | 1¼ | ||
Length of Stud Bolts | 1/16" RF | 2¼ | 2½ | 2½ | 2¾ | 2¾ | 3¼ | 3½ | 3½ | 3½ | 3½ | 3¾ | 4 | 4¼ | 4½ | 4¾ | 5 1/4 | 5 1/4 | 5¾ | 6¼ | 6¾ | |
RTJ |
3 | 3¼ | 3¼ | 3¾ | 4 | 4 | 4 | 4 | 4¼ | 4½ | 4¾ | 5 | 5¼ | 5¾ | 5¾ | 6¼ | 6¾ | 7¼ | ||||
Lth Mach Bolts | 1/16" RF | 2 | 2 | 2¼ | 2¼ | 2½ | 2¾ | 3 | 3 | 3 | 3 | 3 1/4 | 3 1/4 | 3½ | 4 | 4 | 4½ | 4½ | 5 | 5½ | 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 | 1⅛ | 1⅛ | 1¼ | 1¼ | 1¼ | 1½ | ||
Length of Stud Bolts | 1/16" RF | 2½ | 3 | 3 | 3¼ | 3½ | 3½ | 4 | 4¼ | 4¼ | 4½ | 4 3/4 | 4¾ | 5½ | 6¼ | 6¾ | 7 | 7½ | 7¾ | 8 | 9 | |
RTJ |
3 | 3½ | 3½ | 3¾ | 4 | 4 | 4½ | 4¾ | 5 | 5 | 5¼ | 5½ | 6 | 6¾ | 7¼ | 7½ | 8 | 8¼ | 8¾ | 10 | ||
Lth Mach Bolts | 1/16" RF | 2¼ | 2½ | 2½ | 2¾ | 3 | 3 | 3¼ | 3½ | 3¾ | 3¾ | 4¼ | 4¼ | 4¾ | 5½ | 5¾ | 6¼ | 6½ | 6¾ | 7¼ | 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 | 1⅛ | 1¼ | 1¼ | 1⅜ | 1⅜ | 1½ | 1¾ | ||
Length of Stud Bolts | ¼" RF | 3 | 3½ | 3½ | 3¾ | 4¼ | 4¼ | 4¾ | 5 | 5½ | 5½ | 5¾ | 6 | 6¾ | 7½ | 8 | 8¼ | 8¾ | 9 | 9½ | 10½ | |
M&F T&G |
2¾ | 3¼ | 3¼ | 3½ | 4 | 4 | 4½ | 4¾ | 5¼ | 5¼ | 5¼ | 5¾ | 6½ | 7¼ | 7¾ | 8 | 8½ | 8¾ | 9¼ | 10¼ | ||
RTJ | 3 | 3½ | 3½ | 3¾ | 4¼ | 4¼ | 4¾ | 5 | 5½ | 5½ | 5¾ | 6 | 6¾ | 7½ | 8 | 8¼ | 8¾ | 9 | 9¾ | 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 | 1⅛ | 1¼ | 1¼ | 1⅜ | 1½ | 1 5/8 | 1 5/8 | 1 7/8 | ||
Length of Stud Bolts | ¼" RF | 3 | 3½ | 3½ | 3¾ | 4¼ | 4¼ | 4¾ | 5 | 5½ | 5¾ | 6½ | 6¾ | 7½ | 8½ | 8¾ | 9¼ | 10 | 10¾ | 11¼ | 13 | |
M&F T&G |
2¾ | 3¼ | 3¼ | 3½ | 4 | 4 | 4½ | 4¾ | 5¼ | 5½ | 6¼ | 6½ | 7¼ | 8¼ | 8½ | 9 | 9¾ | 10½ | 11 | 12¾ | ||
RTJ | 3 | 3½ | 3½ | 3¾ | 4¼ | 4¼ | 4¾ | 5 | 5½ | 5¾ | 6½ | 6¾ | 7¾ | 8½ | 8¾ | 9¼ | 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 | 1⅛ | 1¼ | 1⅛ | 1⅜ | 1⅜ | 1⅜ | 1½ | 1 5/8 | 1 7/8 | 2 | 2½ | |||
Length of Stud Bolts | ¼" RF | 4¼ | 4½ | 5 | 5 | 5½ | 5¾ | 6¼ | 5¾ | 6¾ | 7½ | 7½ | 8¾ | 9¼ | 10 | 10¾ | 11¼ | 12¾ | 13¾ | 17¼ | ||
M&F T&G |
4 | 4¼ | 4¾ | 4¾ | 5¼ | 5½ | 6 | 5½ | 6½ | 7¼ | 7¼ | 8½ | 9 | 9¾ | 10½ | 11 | 12½ | 13½ | 17 | |||
RTJ | 4¼ | 4½ | 5 | 5 | 5½ | 5¾ | 6¼ | 5¾ | 6¾ | 7½ | 7¾ | 8¾ | 9¼ | 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 | 1⅛ | 1¼ | 1½ | 1⅜ | 1⅝ | 1⅞ | 2 | 2¼ | 2½ | 2¾ | 3 | 3½ | |||
Length of Stud Bolts | ¼" RF | 4¼ | 4½ | 5 | 5 | 5½ | 5¾ | 6¼ | 7 | 7¾ | 9¾ | 101/4 | 11½ | 13¼ | 14¾ | 16 | 17½ | 19½ | 21¼ | 24¼ | ||
M&F T&G |
4 | 4¼ | 4¾ | 4¾ | 5¼ | 5½ | 6 | 6¾ | 7½ | 9½ | 10 | 11¼ | 13 | 14½ | 15¾ | 17¼ | 19¼ | 21 | 24 | |||
RTJ | 4¼ | 4½ | 5 | 5 | 5½ | 5¾ | 6¼ | 7 | 7¾ | 9¾ | 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 | 1⅛ | 1 | 1⅛ | 1¼ | 1½ | 1¾ | 2 | 2 | 2½ | 2¾ | ||||||||
Length of Stud Bolts | ¼" RF | 4¾ | 5 | 5½ | 6 | 6¾ | 7 | 7¾ | 8¾ | 10 | 11¾ | 13½ | 15 | 19¼ | 21¼ | |||||||
M&F T&G |
4½ | 4¾ | 5¼ | 5¾ | 6½ | 6¾ | 7½ | 8½ | 9¾ | 11½ | 13¼ | 14¾ | 19 | 21 | ||||||||
RTJ | 4¾ | 5 | 5½ | 6 | 6¾ | 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.