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Stud Bolts Charts (Sizes, Weights, and Torque)

3 important stud bolts charts: 1- stud bolts dimensions in inches and millimeters (number, diameter, length of stud bolts for ASME flanges of different diameter and rating); 2- stud bolts weight (in kilograms and pounds for metric and imperial bolts, by diameter and length); 3- stud bolt torque chart (tightening sequence and load to ensure proper flanged joints).

STUD BOLTS SIZES (IN INCHES)

Stud bolt and nut for flange
Stud bolts and nuts for flanges

CLASS 150 FLANGES

Stud bolts dimensions for ASME B16.5 RF and RTJ flanges class 150 (in inches)

 Class 150 Flanges ASME B16.5 (Stud bolt sizes) Length of Stud Bolts 
NPS Outside Diameter of Flange The diameter of Bolt Circle The 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

 

CLASS 300 FLANGES

Stud bolts dimensions for ASME B16.5 RF and RTJ flanges class 300 (in inches)

  Class 300 Flanges ASME B16.5 Length of Stud Bolts 
NPS Outside Diameter of Flange The diameter of Bolt Circle The 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

 

CLASS 600 FLANGES

Stud bolts dimensions for ASME B16.5 RF and RTJ flanges class 600 (in inches)

   Class 600 Flanges ASME B16.5 Length of Stud Bolts
NPS Outside Diameter of Flange The diameter of Bolt Circle The 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

 

CLASS 900 FLANGES

Stud bolts dimensions for ASME B16.5 RF and RTJ flanges class 900 (in inches)

    Class 900 Flanges ASME B16.5 Length of Stud Bolts
NPS Outside Diameter of Flange The diameter of Bolt Circle The 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

 

CLASS 1500 FLANGES

Stud bolts dimensions for ASME B16.5 RF and RTJ flanges class 1500 (in inches)

     Class 1500 Flanges ASME B16.5 Length of Stud Bolts
NPS Outside Diameter of Flange The diameter of Bolt Circle The 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

 

STUD BOLTS SIZES (IN MILLIMETERS)

CLASS 150 FLANGES

Stud bolts dimensions for ASME B16.5 RF and RTJ flanges class 150 (in millimeters)

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

 

CLASS 300 FLANGES

Stud bolts dimensions for ASME B16.5 RF and RTJ flanges class 300 (in millimeters)

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

CLASS 400 FLANGES

Stud bolts dimensions for ASME B16.5 RF and RTJ flanges class 400 (in millimeters)

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

CLASS 600 FLANGES

Stud bolts dimensions for ASME B16.5 RF and RTJ flanges class 600 (in millimeters)

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

CLASS 900 FLANGES

Stud bolts dimensions for ASME B16.5 RF and RTJ flanges class 900 (in millimeters)

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

CLASS 1500 FLANGES

Stud bolts dimensions for ASME B16.5 RF and RTJ flanges class 1500 (in millimeters)

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

CLASS 2500 FLANGES

Stud bolts dimensions for ASME B16.5 RF and RTJ flanges class 2500 (in millimeters)

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

 

STUD BOLTS WEIGHT

WEIGHT IMPERIAL STUD BOLTS

The table shows the weight in kgs. for 100 imperial stud bolts, including 1 threaded rod and 2 heavy hexagonal nuts

STUD BOLT LENGTH (in inches) 1/2 5/8 3/4 7/8 1 1 1/8 1 1/4 1.3/8 1 1/2 1.5/8 1.3/4 1 7/8
2.1/2 10.8
2.3/4 11.6 19.8
3.1/4 12.4 21 32.4
3.1/2 13.2 22.2 34.3 50
4 14 23.4 36.2 52.6 71.8
4.1/2 14.8 24.6 38.1 55.2 75.2 102
4.3/4 15.6 25.8 40 57.8 78.6 106 137
5 16.4 27 41.9 60.4 82 111 142 179
5.1/2 17.2 28.2 43.8 63 85.4 115 147 186 234
6 18 29.4 45.7 65.6 88.8 119 153 193 242 289
6.1/4 18.8 30.6 47.6 68.2 92.2 123 158 200 250 298 263
6.1/2 19.6 32.3 49.5 70.8 95.6 128 164 206 258 308 374 437
7 20.4 33.5 50.8 73.4 99 132 169 213 266 317 385 449
7.1/2 21.2 34.8 52.7 75.5 103 136 174 220 275 326 396 462
8 22 36.1 54.5 78 106 141 180 226 283 336 407 475
8.1/4 37.3 56.3 80.5 108 145 185 233 291 345 418 488
8.3/4 38.6 58.1 83.1 112 149 191 240 299 354 429 500
9 39.8 60 85.6 115 153 196 246 307 364 440 513
9.1/2 41.1 61.8 88.2 118 158 201 253 316 373 451 526
10 63.7 90.7 122 162 206 260 324 382 463 538
10/1.4 93.3 125 166 212 267 332 391 474 551
1.0.1/2 128 171 217 273 340 401 485 564
11 132 175 223 279 345 410 496 576
11.1/2 135 179 228 285 350 419 507 589
12 138 184 233 292 358 429 518 602

WEIGHT OF METRIC STUD BOLTS

The table shows the weight in kgs. for 100 metric stud bolts, including 1 threaded rod and 2 heavy hexagonal nuts.

STUD BOLT LENGTH (in mm) M10 M12 M14 M16 M18 M20 M22 M24 M27 M30 M33 M36 M39
60 5,6 8,1 12 15,6
70 6,1 8,9 13 16,9 23,7
80 6,6 9,6 14 18,2 25,4 32,5
90 7,1 10,3 15 19,6 27,1 34,5 45,5
100 7,6 11 16 21 28,8 36,7 47,2 54,2
110 8,1 11,7 17 22,2 30,4 38,7 48,3 58,2 80
120 8,6 12,4 18 23,6 32,1 40,7 50,9 60,2 84,7 107
130 9,1 13,2 19 24,9 33,7 42,8 53,4 63,2 88,6 111 141
140 9,6 14,2 20 26,2 35,4 44,9 55,9 66,2 92,4 116 147 185
150 10,1 14,9 20,8 27,5 36,9 46,9 58,5 69,2 96,3 121 153 192 237
160 10,6 15,6 21,8 29,1 38,6 49 61 72,2 100,1 126 159 199 245
170 16,4 22,8 30,4 40,2 51,1 63,5 75,2 104 130 165 206 253
180 23,8 31,8 41,9 52,3 66,1 78,1 108 135 171 213 261
190 33,1 43,5 54,4 68,4 81,1 112 140 176 219 269
200 34,5 45,2 56,2 71 84 116 144 182 226 278
210 35,8 46,8 58,5 73,5 88,4 120 149 188 233 286
220 37,1 48,4 60,6 76,1 91,4 124 154 194 240 294
230 38,5 50,1 62,6 78,6 94,4 127 159 201 247 302
240 39,8 51,7 64,7 81,2 97,4 130,9 164 208 253 310
250 41,1 53,4 66,8 83,7 100,4 134,8 172 214 260 319
260 55 68,8 86,3 103,4 138,6 177 220 267 327
270 56,6 70,9 88,8 106,4 142,5 182 224 274 335
280 58,3 73 91,4 109,4 146,3 187 230 281 343
290 75 93,9 112,4 150,1 192 236 291 360
300 77,1 96,5 115,4 154 196 241 298 368
320 101,6 121,3 161,7 206 253 312 380
340 127,3 169,4 215 265 326 395
360 133,3 177,1 224 276 340 411
380 184,8 234 288 353 428
400 192,5 243 299 367 444
420 252 311 381 460
440 262 322 394 477
460 271 334 408 493
480 281 345 422 509
500 290 357 436 526

Stud bolt weight includes 2 heavy hex steel nuts

STUD BOLTS TORQUE CHART

The stud bolt and nut torque chart show the sequence to use, and the force to apply, to stud bolts used to tighten flanges (by flange class). The torque chart is for reference only and assumes properly lubricated ASTM A193 B7 stud bolts with ASTM A194 2H steel nuts.

CLASS 150 FLANGE

Stud bolt torque chart for ASME B16.5 FF and RF class 150 flanges

Flange
Size
B16.5 Class 150 RF/ Ring Gaskets B16.5 Class 150 FF/ Full Face Gaskets
Torque / Round (ft-lbs) Stud Bolts Tighten Sequence Torque / Round (ft-lbs) Stud Bolts Tighten Sequence
1st 2nd Final Dwg/No. Bolt Size 1st 2nd Final Dwg*/No. Bolt Size
1/2″ 10 20 30 4-bolt 1/2″ 20 40 60 4-bolt 1/2″
3/4″ 13 27 40 4-bolt 1/2″ 20 40 60 4-bolt 1/2″
1″ 15 30 50 4-bolt 1/2″ 20 40 60 4-bolt 1/2″
1-1/4″ 20 40 60 4-bolt 1/2″ 20 40 60 4-bolt 1/2″
1-1/2″ 20 40 60 4-bolt 1/2″ 20 40 60 4-bolt 1/2″
2″ 40 80 120 4-bolt 5/8″ 40 80 120 4-bolt 5/8″
2-1/2″ 40 80 120 4-bolt 5/8″ 40 80 120 4-bolt 5/8″
3″ 40 80 120 4-bolt 5/8″ 40 80 120 4-bolt 5/8″
3-1/2″ 40 80 120 8-bolt 5/8″ 40 80 120 8-bolt 5/8″
4″ 40 80 120 8-bolt 5/8″ 40 80 120 8-bolt 5/8″
5″ 60 120 200 8-bolt 3/4″ 60 120 200 8-bolt 3/4″
6″ 60 120 200 8-bolt 3/4″ 60 120 200 8-bolt 3/4″
8″ 60 120 200 8-bolt 3/4″ 60 120 200 8-bolt 3/4″
10″ 95 190 320 12-bolt 7/8″ 95 190 320 12-bolt 7/8″
12″ 95 190 320 12-bolt 7/8″ 95 190 320 12-bolt 7/8″
14″ 147 294 490 12-bolt 1″ 147 294 490 12-bolt 1″
16″ 147 294 490 16-bolt 1″ 147 294 490 16-bolt 1″
18″ 213 426 710 16-bolt 1-1/8″ 213 426 710 16-bolt 1-1/8″
20″ 213 426 710 20-bolt 1-1/8″ 213 426 710 20-bolt 1-1/8″
24″ 300 600 1,000 20-bolt 1-1/4″ 300 600 1,000 20-bolt 1-1/4″

CLASS 300 FLANGE

Stud bolt torque chart for ASME B16.5 FF and RF class 300 flanges

Flange Size B16.5 Class 300 RF/ Ring Gaskets
Torque / Round (ft-lbs) Stud Bolts Tighten Sequence*
1st 2nd Final Dwg/No. Stud Bolts Size
1/2″ 10 20 30 4-bolt 1/2″
3/4″ 15 30 50 4-bolt 5/8″
1″ 21 42 70 4-bolt 5/8″
1-1/4″ 30 60 100 4-bolt 5/8″
1-1/2″ 45 90 150 4-bolt 3/4″
2″ 33 66 110 8-bolt 5/8″
2-1/2″ 42 84 140 8-bolt 3/4″
3″ 60 120 200 8-bolt 3/4″
3-1/2″ 60 120 200 8-bolt 3/4″
4″ 60 120 200 8-bolt 3/4″
5″ 60 120 200 8-bolt 3/4″
6″ 60 120 200 12-bolt 3/4″
8″ 95 190 320 12-bolt 7/8″
10″ 147 294 490 16-bolt 1″
12″ 213 426 710 16-bolt 1-1/8″
14″ 195 390 650 20-bolt 1-1/8″
16″ 273 546 910 20-bolt 1-1/4″
18″ 300 600 1,000 24-bolt 1-1/4″
20″ 300 600 1,000 24-bolt 1-1/4″
24″ 465 930 1,550 24-bolt 1-1/2″

Stud bolt tightening sequence:
Stud Bolt Tightening Sequence

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