Dimensions of Stud bolts 600# and 900# 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 600 RTJ Class 900 RTJ
1/2 15 4 1/2 x 75 R11 4 3/4 x 110 R12
3/4 20 4 5/8 x 90 R13 4 3/4 x 115 R14
1 25 4 5/8 x 90 R16 4 7/8 x 125 R16
1 1/2 40 4 3/4 x 110 R20 4 1 x 140 R20
2 50 8 5/8 x 110 R23 8 7/8 x 145 R24
2 1/2 65 8 3/4 x 120 R26 8 7/8 x 160 R27
3 80 8 3/4 x 125 R31 8 7/8 x 145 R31
4 100 8 7/8 x 145 R37 8 1 1/8 x 170 R37

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 600 RTJ Class 900 RTJ
6 150 12 1 x 170 R45 12 1 1/8 x 195 R45
8 200 12 1 1/8 x 195 R49 12 1 3/8 x 220 R49
10 250 16 1 1/4 x 215 R53 16 1 3/8 x 235 R53
12 300 20 1 1/4 x 220 R57 20 1 3/8 x 255 R57
14 350 20 1 3/8 x 235 R61 20 1 1/2 x 280 R62
16 400 20 1 1/2 x 255 R65 20 1 5/8 x 290 R66
18 450 20 1 5/8 x 275 R69 20 1 7/8 x 335 R70
20 500 24 1 5/8 x 290 R73 20 2 x 360 R74
24 600 24 1 7/8 x 335 R77 20 2 1/2 x 455 R78