Dimensions of Stud bolts 1500# and 2500# RTJ flanges

Bolt dimensions for ASME flanges

Nom Pipe
Size
Nom Pipe
Size
Number of
bolts
Dim (inch) x
Length (mm)
Ring Number Number of
bolts
Dim (inch) x
Length (mm)
Ring Number
inchesmm Class 1500 RTJ Class 2500 RTJ
1/2 15 4 3/4 x 110 R12 4 3/4 x 120 R13
3/4 20 4 3/4 x 115 R14 4 3/4 x 125 R16
1 25 4 7/8 x 125 R16 4 7/8 x 140 R18
1 1/2 40 4 1 x 140 R20 4 1 1/8 x 170 R23
2 50 8 7/8 x 145 R24 8 1 x 180 R26
2 1/2 65 8 1 x 160 R27 8 1 1/8 x 205 R28
3 80 8 1 1/8 x 180 R35 8 1 1/4 x 230 R32
4 100 8 1 1/4 x 195 R39 8 1 1/2 x 260 R38

Nom Pipe
Size
Nom Pipe
Size
Number of
bolts
Dim (inch) x
Length (mm)
Ring Number Number of
bolts
Dim (inch) x
Length (mm)
Ring Number
inchesmm Class 1500 RTJ Class 2500 RTJ
6 150 12 1 3/8 x 265 R46 8 2 x 355 R47
8 200 12 1 5/8 x 325 R50 12 2 x 395 R51
10 250 12 1 7/8 x 345 R54 12 2 1/2 x 510 R55
12 300 16 2 x 385 R58 12 2 3/4 x 560 R60
14 350 16 2 1/4 x 425 R63      
16 400 16 2 1/2 x 470 R67      
18 450 16 2 3/4 x 525 R71      
20 500 16 3 x 565 R75      
24 600 16 3 1/2 x 645 R79