The stud bolt chart outlines the required number, diameter, and length of stud bolts for flanges with raised and ring joint face finish

 

Stud lengths are measured in inches, from first thread to last thread as shown in the image, assuming ASME B16.5 flanges specifications.

Stud bolt for flange       Stud Bolt Chart

 

STUD BOLT CHART IN INCHES

STUD BOLT CHART FOR CLASS 150 RF AND RTJ FLANGE (in inches)

 Class 150 Flanges ASME B16.5 Length of Stud Bolts 
NPS Outside Diameter of Flange Diameter of Bolt Circle Diameter of Bolt Holes Number of Bolts Diameter of Bolts Raised Face
0.06 in
Ring Joint
1/2 3 1/2 2 3/8 5/8 4 1/2 2 1/4
3/4 3 7/8 2 3/4 5/8 4 1/2 2 1/2
1 4 1/4 3 1/8 5/8 4 1/2 2 1/2 3
1 1/4 4 5/8 3 1/2 5/8 4 1/2 2 3/4 3 1/4
1 1/2 5 3 7/8 5/8 4 1/2 2 3/4 3 1/4
2 6 4 3/4 3/4 4 5/8 3 1/4 3 3/4
2 1/2 7 5 1/2 3/4 4 5/8 3 1/2 4
3 7 1/2 6 3/4 4 5/8 3 1/2 4
3 1/2 8 1/2 7 3/4 8 5/8 3 1/2 4
4 9 7 1/2 3/4 8 5/8 3 1/2 4
5 10 8 1/2 7/8 8 3/4 3 3/4 4 1/4
6 11 9 1/2 7/8 8 3/4 4 4 1/2
8 13 1/2 11 3/4 7/8 8 3/4 4 1/4 4 3/4
10 16 14 3/4 1 12 7/8 4 1/2 5
12 19 17 1 12 7/8 4 3/4 5 1/4
14 21 18 3/4 1 1/8 12 1 5 1/4 5 3/4
16 23 1/2 21 1/4 1 1/8 16 1 5 1/4 5 3/4
18 25 22 3/4 1 1/4 16 1 1/8 5 3/4 6 1/4
20 27 1/2 25 1 1/4 20 1 1/8 6 1/4 6 3/4
24 32 29 1/2 1 1/4 20 1 1/4 6 3/4 7 1/4

 Lengths in inches

 

STUD BOLT CHART FOR CLASS 300 RF AND RTJ FLANGE (in inches)

  Class 300 Flanges ASME B16.5 Length of Stud Bolts 
NPS Outside Diameter of Flange Diameter of Bolt Circle Diameter of Bolt Holes Number of Bolts Diameter of Bolts Raised Face
0.06 in
Ring Joint
1/2 3 3/4 2 5/8 5/8 4 1/2 2 1/2 3
3/4 4 5/8 3 1/4 3/4 4 5/8 3 3 1/2
1 4 7/8 3 1/2 3/4 4 5/8 3 3 1/2
1 1/4 5 1/4 3 7/8 3/4 4 5/8 3 1/4 3 3/4
1 1/2 6 1/8 4 1/2 7/8 4 3/4 3 1/2 4
2 6 1/2 5 3/4 8 5/8 3 1/2 4
2 1/2 7 1/2 5 7/8 7/8 8 3/4 4 4 1/2
3 8 1/4 6 5/8 7/8 8 3/4 4 1/4 4 3/4
3 1/2 9 7 1/4 7/8 8 3/4 4 1/4 5
4 10 7 7/8 7/8 8 3/4 4 1/2 5
5 11 9 1/4 7/8 8 3/4 4 3/4 5 1/4
6 12 1/2 10 5/8 7/8 12 3/4 4 3/4 5 1/2
8 15 13 1 12 7/8 5 1/2 6
10 17 1/2 15 1/4 1 1/8 16 1 6 1/4 6 3/4
12 20 1/2 17 3/4 1 1/4 16 1 1/8 6 3/4 7 1/4
14 23 20 1/4 1 1/4 20 1 1/8 7 7 1/2
16 25 1/2 22 1/2 1 3/8 20 1 1/4 7 1/2 8
18 28 24 3/4 1 3/8 24 1 1/4 7 3/4 8 1/4
20 30 1/2 27 1 3/8 24 1 1/4 8 8 3/4
24 36 32 1 5/8 24 1 1/2 9 10

 Lengths in inches

 

STUD BOLT CHART FOR CLASS 600 RF AND RTJ FLANGE (in inches)

   Class 600 Flanges ASME B16.5 Length of Stud Bolts
NPS Outside Diameter of Flange Diameter of Bolt Circle Diameter of Bolt Holes Number of Bolts Diameter of Bolts Raised Face
0.06 in
Ring Joint
1/2 3 3/4 2 5/8 5/8 4 1/2 3 3
3/4 4 5/8 3 1/4 3/4 4 5/8 3 1/2 3 1/2
1 4 7/8 3 1/2 3/4 4 5/8 3 1/2 3 1/2
1 1/4 5 1/4 3 7/8 3/4 4 5/8 3 3/4 3 3/4
1 1/2 6 1/8 4 1/2 7/8 4 3/4 4 1/4 4 1/4
2 6 1/2 5 3/4 8 5/8 4 1/4 4 1/4
2 1/2 7 1/2 5 7/8 7/8 8 3/4 4 3/4 4 3/4
3 8 1/4 6 5/8 7/8 8 3/4 5 5
3 1/2 9 7 1/4 1 8 7/8 5 1/2 5 1/2
4 10 3/4 8 1/2 1 8 7/8 5 3/4 5 3/4
5 13 10 1/2 1 1/8 8 1 6 1/2 6 1/2
6 14 11 1/2 1 1/8 12 1 6 3/4 6 3/4
8 16 1/2 13 3/4 1 1/4 12 1 1/8 7 1/2 7 3/4
10 20 17 1 3/8 16 1 1/4 8 1/2 8 1/2
12 22 19 1/4 1 3/8 20 1 1/4 8 3/4 8 3/4
14 23 3/4 20 3/4 1 1/2 20 1 3/8 9 1/4 9 1/4
16 27 23 3/4 1 5/8 20 1 1/2 10 10
18 29 1/4 25 3/4 1 3/4 20 1 5/8 10 3/4 10 3/4
20 32 28 1/2 1 3/4 24 1 5/8 11 1/4 11 1/2
24 37 33 2 24 1 7/8 13 13 1/4

 Lengths in inches

 

STUD BOLT CHART FOR CLASS 900 RF AND RTJ FLANGE (in inches)

    Class 900 Flanges ASME B16.5 Length of Stud Bolts
NPS Outside Diameter of Flange Diameter of Bolt Circle Diameter of Bolt Holes Number of Bolts Diameter of Bolts Raised Face
0.06 in
Ring Joint
1/2 4 3/4 3 1/4 7/8 4 3/4 4 1/4 4 1/4
3/4 5 1/8 3 1/2 7/8 4 3/4 4 1/2 4 1/2
1 5 7/8 4 1 4 7/8 5 5
1 1/4 6 1/4 4 3/8 1 4 7/8 5 5
1 1/2 7 4 7/8 1 1/8 4 1 5 1/2 5 1/2
2 8 1/2 6 1/2 1 8 7/8 5 3/4 5 3/4
2 1/2 9 5/8 7 1/2 1 1/8 8 1 6 1/4 6 1/4
3 9 1/2 7 1/2 1 8 7/8 5 3/4 5 3/4
4 11 1/2 9 1/4 1 1/4 8 1 1/8 6 3/4 6 3/4
5 13 3/4 11 1 3/8 8 1 1/4 7 1/2 7 1/2
6 15 12 1/2 1 1/4 12 1 1/8 7 1/2 7 3/4
8 18 1/2 15 1/2 1 1/2 12 1 3/8 8 3/8 8 3/4
10 21 1/2 18 1/2 1 1/2 16 1 3/8 9 1/4 9 1/4
12 24 21 1 1/2 20 1 3/8 10 10
14 25 1/4 22 1 5/8 20 1 1/2 10 3/4 11
16 27 3/4 24 1/4 1 3/4 20 1 5/8 11 1/4 11 1/2
18 31 27 2 20 1 7/8 12 3/4 13 1/4
20 33 3/4 29 1/2 2 1/8 20 2 13 3/4 14 1/4
24 41 35 1/2 2 5/8 20 2 1/2 17 1/4 18

 Lengths in inches

 

STUD BOLT CHART FOR CLASS 1500 RF AND RTJ FLANGE (in inches)

     Class 1500 Flanges ASME B16.5 Length of Stud Bolts
NPS Outside Diameter of Flange Diameter of Bolt Circle Diameter of Bolt Holes Number of Bolts Diameter of Bolts Raised Face
0.06 in
Ring Joint
1/2 4 3/4 3 1/4 7/8 4 3/4 4 1/4 4 1/4
3/4 5 1/8 3 1/2 7/8 4 3/4 4 1/2 4 1/2
1 5 7/8 4 1 4 7/8 5 5
1 1/4 6 1/4 4 3/8 1 4 7/8 5 5
1 1/2 7 4 7/8 1 1/8 4 1 5 1/2 5 1/2
2 8 1/2 6 1/2 1 8 7/8 5 3/4 5 3/4
2 1/2 9 5/8 7 1/2 1 1/8 8 1 6 1/4 6 1/4
3 10 1/2 8 1 1/4 8 1 1/8 7 7
4 12 1/4 9 1/2 1 3/8 8 1 1/4 7 3/4 7 3/4
5 14 3/4 11 1/2 1 5/8 8 1 1/2 9 3/4 9 3/4
6 15 1/2 12 1/2 1 1/2 12 1 3/8 10 1/4 10 1/2
8 19 15 1/2 1 3/4 12 1 5/8 11 1/2 12 3/4
10 23 19 2 12 1 7/8 13 1/4 13 1/2
12 26 1/2 22 1/2 2 1/8 16 2 14 3/4 15 1/4
14 29 1/2 25 2 3/8 16 2 1/4 16 16 3/4
16 32 1/2 27 3/4 2 5/8 16 2 1/2 17 1/2 18 1/2
18 36 30 1/2 2 7/8 16 2 3/4 19 1/2 20 3/4
20 38 3/4 32 3/4 3 1/8 16 3 21 1/4 22 1/4
24 46 39 3 5/8 16 3 1/2 24 1/4 25 1/2

 Lengths in inches

 

STUD BOLT CHART IN MM

STUD BOLT CHART FOR CLASS 150 RF AND RTJ FLANGES (in mm)

NPS STUD BOLTS DIAMETER in. LENGHT RF LENGHT
RTJ
STUD BOLTS NUMBER
1/2 1/2 55 4
3/4 1/2 65 .. 4
1 1/2 65 75 4
1.1/4 1/2 70 85 4
1.1/2 1/2 70 85 4
2 5/8 85 95 4
2.1/2 5/8 90 100 4
3 5/8 90 100 4
3.1/2 5/8 90 100 8
4 5/8 90 100 8

 

NPS STUD BOLTS DIAMETER in. LENGHT RF LENGHT
RTJ
STUD BOLTS NUMBER
5 3/4 95 110 8
6 3/4 100 115 8
8 3/4 110 120 8
10 7/8 115 125 12
12 7/8 120 135 12
14 1 135 145 12
16 1 135 145 16
18 1.1/8 145 160 16
20 1.1/8 160 170 20
24 1.1/4 170 185 20

Lengths in mm

 

STUD BOLT CHART FOR CLASS 300 RF AND RTJ FLANGES (in mm)

NPS STUD BOLTS
DIAMETER in.
LENGHT
RF
LENGHT
RTJ
BOLTS NUMBER
1/2 1/2 65 75 4
3/4 5/8 75 90 4
1 5/8 75 90 4
1.1/4 5/8 85 95 4
1.1/2 3/4 90 100 4
2 5/8 90 100 8
2.1/2 3/4 100 115 8
3 3/4 110 120 8
3.1/2 3/4 110 125 8
4 3/4 115 125 8

 

NPS STUD BOLTS
DIAMETER in.
LENGHT
RF
LENGHT
RTJ
BOLTS NUMBER
5 3/4 120 135 8
6 3/4 120 140 12
8 7/8 140 150 12
10 1 160 170 16
12 1.1/8 170 185 16
14 1.1/8 180 190 20
16 1.1/4 190 205 20
18 1.1/4 195 210 24
20 1.1/4 205 220 24
24 1.1/2 230 255 24

 Lengths in mm

 

STUD BOLT CHART FOR CLASS 400 RF AND RTJ FLANGES (in mm)

NPS STUD BOLTS
DIAMETER in.
LENGHT
RF
LENGHT
RTJ
BOLTS NUMBER
1/2 1/2 75 75 4
3/4 5/8 90 90 4
1 5/8 90 90 4
1.1/4 5/8 95 95 4
1.1/2 3/4 110 110 4
2 5/8 110 110 8
2.1/2 3/4 120 120 8
3 3/4 125 125 8
3.1/2 7/8 140 140 8
4 7/8 140 140 8

 

NPS STUD BOLTS
DIAMETER in.
LENGHT
RF
LENGHT
RTJ
BOLTS NUMBER
5 7/8 145 145 8
6 7/8 150 150 12
8 1 170 170 12
10 1.1/8 190 190 16
12 1.1/4 205 205 16
14 1.1/4 210 210 20
16 1.3/8 220 220 20
18 1.3/8 230 230 24
20 1.1/2 240 250 24
24 1.3/4 265 280 24

Lengths in mm 

 

STUD BOLT CHART FOR CLASS 600 RF AND RTJ FLANGES (in mm)

NPS STUD BOLTS
DIAMETER in.
LENGHT
RF
LENGHT
RTJ
STUD BOLTS
NUMBER
1/2 1/2 75 75 4
3/4 5/8 90 90 4
1 5/8 90 90 4
1.1/4 5/8 95 95 4
1.1/2 3/4 110 110 4
2 5/8 110 110 8
2.1/2 3/4 120 120 8
3 3/4 125 125 8
3.1/2 7/8 140 140 8
4 7/8 145 145 8

 

NPS STUD BOLTS
DIAMETER in.
LENGHT
RF
LENGHT
RTJ
STUD BOLTS
NUMBER
5 1 165 165 8
6 1 170 170 12
8 1.1/8 190 195 12
10 1.1/4 215 215 16
12 1.1/4 220 220 20
14 1.3/8 235 235 20
16 1.1/2 255 255 20
18 1.5/8 275 275 20
20 1.5/8 285 290 24
24 1.7/8 330 335 24

 Lengths in mm

 

STUD BOLT CHART FOR CLASS 900 RF AND RTJ FLANGES (in mm)

NPS STUD BOLTS
DIAMETER in.
LENGHT
RF
LENGHT
RTJ
STUD BOLTS
NUMBER
1/2 3/4 110 110 4
3/4 3/4 115 115 4
1 7/8 125 125 4
1.1/4 7/8 125 125 4
1.1/2 1 140 140 4
2 7/8 145 145 8
2.1/2 1 160 160 8
3 7/8 145 145 8
4 1.1/8 170 170 8
5 1.1/4 190 190 8

 

NPS STUD BOLTS
DIAMETER in.
LENGHT
RF
LENGHT
RTJ
STUD BOLTS
NUMBER
6 1.1/8 190 195 12
8 1.3/8 220 220 12
10 1.3/8 235 235 16
12 1.3/8 255 255 20
14 1.1/2 275 280 20
16 1.5/8 285 290 20
18 1.7/8 325 335 20
20 2 350 360 20
24 2.1/2 440 455 20

 Lengths in mm

 

STUD BOLT CHART FOR CLASS 1500 RF AND RTJ FLANGES (in mm)

NPS STUD BOLTS
DIAMETER in.
LENGHT
RF
LENGHT
RTJ
STUD BOLTS
NUMBER
1/2 3/4 110 110 4
3/4 3/4 115 115 4
1 7/8 125 125 4
1.1/4 7/8 125 125 4
1.1/2 1 140 140 4
2 7/8 145 145 8
2.1/2 1 160 160 8
3 1.1/8 180 180 8
4 1.1/4 195 195 8
5 1.1/2 250 250 8

 

NPS STUD BOLTS
DIAMETER in.
LENGHT
RF
LENGHT
RTJ
STUD BOLTS
NUMBER
6 1.3/8 260 265 12
8 1.5/8 290 300 12
10 1.7/8 335 345 12
12 2 375 385 16
14 2.1/4 405 425 16
16 2.1/2 445 470 16
18 2.3/4 495 525 16
20 3 540 565 16
24 3.1/2 615 650 16

 Lengths in mm

 

STUD BOLT CHART FOR CLASS 2500 RF AND RTJ FLANGES (in mm)

NPS STUD BOLTS
DIAMETER in.
LENGHT
RF
LENGHT
RTJ
STUD BOLTS
NUMBER
1/2 3/4 120 120 4
3/4 3/4 125 125 4
1 7/8 140 140 4
1.1/4 1 150 150 4
1.1/2 1.1/8 170 170 4
2 1 180 180 8
2.1/2 1.1/8 195 205 8

 

NPS STUD BOLTS
DIAMETER in.
LENGHT
RF
LENGHT
RTJ
STUD BOLTS
NUMBER
6 1.3/8 260 265 12
8 1.5/8 290 300 12
10 1.7/8 335 345 12
12 2 375 385 16
14 2.1/4 405 425 16
16 2.1/2 445 470 16
18 2.3/4 495 525 16
20 3 540 565 16
24 3.1/2 615 650 16

Lengths in mm