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NUMBER & SIZE OF BOLTS FOR FLANGED JOINTS-ASME B16.5

Lengths of studs and bolts, when used with lap joint flanges, are dependent upon the thickness of the lap of the stub end.
Stud-Bolt lengths do not Include the height of the points.
PRIMARY
SERVICE
PRESSURE BOLTING FLANGE
N 0 M I N A L p I p E sI z E
RATING FACING
1/2 3/4 1 1 1/4 1 1/2 2 2 3 3 1/2 4 5 6 8 10 12 14 16 18 20 24
1/2
Number 4 4 4 4 4 4 4 4 8 8 8 8 8 12 12 12 16 16 20 20

1/2 112 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 I 1 1 1/8 I 1/8 1 1/4
Diameter

Class Length 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
of Stud
150 Bolts RTJ 3 3 1/4 3 1/4 3 3/4 4 4 4 4 4 4 1/2 4 3/4 5 5 1/4 5 3/4 5 3/4 6 114 6 3 /4 7 1/4
Length or 1/4
Mach. Bolts 1/16" RF 2 2 2 1/4 2 1/4 2 1/2 2 3/4 3 3 3 3 3 3 1/4 3 1/2 4 4 4 1/2 4 1/2 5 5 1/2 6
1/4
Ring No. R15 Rl7 R19 R22 R25 R29 R33 R36 R40 R43 R48 R52 R56 R59 R64 R68 R72 R76

4 4 4 4 4 8 8 8 8 8 8 12 12 16 16 20 20 24 24 24
Number
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 I 1 1/8 I 1/8 I 1/4 I 1/4 I 1/4 I 1/2
Diameter
Class Length 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
1/16" RF
of Stud
300 Bolts RTJ 3 3 1/2 3 1/2 3 3/4 4 4 4 1/2 4 3/4 5 5 5 5 1/2 6 6 3/4 7 1/4 7 1/2 8 8 1/4 8 3/4 10
1/4
Length or 2 1/2 2 1/2 2 3/4 3 3 3 1/4 3 1/2 3 3/4 3 3/4 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
Mach. Bolts 1/16" RF 2 1/4 8
1/4
Ring No. RII R13 R16 Rl8 R20 R23 R26 R31 R34 R37 R41 R45 R49 R53 R57 R61 R65 R69 R73 R77

Number
I
I 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 I I 1/8 I 1/4 I 1/4 I 3/8 1 3/8 I 1/2 I 3 /4
Class
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 IO 1/2
Length 1/4" RF
400 of Stud M&F 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 5 3/4 6 1/2 7 1/4 7 3/4 8 8 1/2 8 3/4 9 1/4 IO 1/4
Bolts T&G 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 II

Ring No. RII R13 R16 R18 R20 R23 R26 R31 R34 R37 R41 R45 R49 R53 R57 R61 R65 R69 R73 R77
r
4 4 4 4 4 8 8 8 8 8 8 12 12 16 20 20 20 20 24 24
Number
1/2 5/8 5/8 5/8 3/4 5/8 3/4 3/4 7/8 7/8 I 1 I 1/8 I 1/4 I 1/4 l 3/8 I 1/2 I 5/8 1 5/8 I 7/8
Diameter
Class
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 IO 10 3/4 II 1/4 13

Length M&F
600 of St ud 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 II 12 3/4
Bolts
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 II 1/2 13 1/4

Ring No. RII Rl3 Rl6 Rl8 R20 R23 R26 R31 R34 R37 R41 R45 R49 R53 R57 R61 R65 R69 R73 R77

Number :t\ 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 I 1/2 1 5/8 I 7/8 2 2 1/2
Class
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 IO 10 3/4 111/4 12 3/4 13 3/4 17 1/4

900 Length
of Stud M&F 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 II 12 1/2 13 1/2 17
Bolts T&G
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. Rl2 Rl 4 Rl6 Rl8 R20 R24 R27 RJI R37 R41 R45 R49 R53 R57 R62 R66 R70 R74 R78

Number
" 4 4 4 4 4 8 8 8 8 8 12 12 12 16 16 16 16 16 16

3/4 3/4 7/8 7/8 1 7/8 1 1 1/8 1 1/4 I 1/2 I 3/8 1 5/8 1 7/8 2 2 1/4 2 1/2 2 3/4 3 3 1/2
Diameter

Class 1/4 " RF 4 1/4 4 1/2 5 5 5 1/2 5 3/4 6 J/4 7 7 3/4 9 3/4 10 1/4 II 1/2 13 1/4 14 3/4 16 17 1/2 19 1/2 21 1/4 24 1/4
Length
of Stud M&F 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 II 1/4 13 14 1/2 15 3/4 17 1/4 19 1/4 21 24
1500 Bolts T&G 4
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. Rl2 Rl4 Rl6 Rl8 R20 R24 R27 R35 R39 R44 R46 R50 R54 R58 R63 R67 R71 R75 R79

Number 4 4 4 4 4 8 8

3/4 3/4 7/8 I I 1/8 I I 1/8

8
I 1/4
- 8
I 1/2
8
I 3/4
8
2
12
2
12
2 1/2
12
2 3/4
Diameter
Class 1/4" RF 4 3/4 5 5 1/2 6 6 3/4 7 7 3/4 8 3/4 10 11 13 1/2 15 19 1/4 211/4
Length 3/4
2500 of Stud M&F 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 13 1/4 14 3/4 19 21
Bolts T&G 1/2
4 3/4 5 5 1/2 6 6 3/4 7 8 9 10 1/4 121/4 14 151/2 20 22

Ring No. RTJ R13 R16 Rl8 R21 R23 R26 R28 R32 R38 R42 R47 RSI R55 R60