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Flange Bolting Chart

Class 150 Flanges

Nominal Pipe Size # Bolts or Studs Dia of Bolts or Studs Length of Stud
1/16 RF RTJ
1/2 4 0.50 2-1/4
3/4 4 0.50 2-1/2
1 4 0.50 2-1/2 3
1-1/4 4 0.50 2-3/4 3-1/4
1-1/2 4 0.50 2-3/4 3-1/4
2 4 0.63 3-1/4 3-3/4
2-1/2 4 0.63 3-1/2 4
3 4 0.63 3-1/2 4
3-1/2 8 0.63 3-1/2 4
4 8 0.63 3-1/2 4
5 8 0.75 3-3/4 4-1/4
6 8 0.75 4 4-1/2
8 8 0.75 4-1/4 4-3/4
10 12 0.88 4-1/2 5
12 12 0.88 4-3/4 5-1/4
14 12 1.00 5-1/4 5-3/4
16 16 1.00 5-1/4 5-3/4
18 16 1.13 5-3/4 6-1/4
20 20 1.13 6-1/4 6-3/4
24 20 1.25 6-3/4 7-1/4

Class 300 Flanges

Nominal Pipe Size # Bolts or Studs Dia of Bolts or Studs Length of Stud
1/16 RF RTJ
1/2 4 0.50 2-1/2 3
3/4 4 0.63 3 3-1/2
1 4 0.63 3 3-1/2
1-1/4 4 0.63 3-1/4 3-3/4
1-1/2 4 0.75 3-1/2 4
2 8 0.63 3-1/2 4
2-1/2 8 0.75 4 4-1/2
3 8 0.75 4-1/4 4-3/4
3-1/2 8 0.75 4-1/4 5
4 8 0.75 4-1/2 5
5 8 0.75 4-3/4 5-1/4
6 12 0.75 4-3/4 5-1/2
8 12 0.88 5-1/2 6
10 16 1.00 6-1/4 6-3/4
12 16 1.13 6-3/4 7-1/4
14 20 1.13 7 7-1/2
16 20 1.25 7-1/2 8
18 24 1.25 7-3/4 8-1/4
20 24 1.25 8 8-3/4
24 24 1.50 9 10

Class 600 Flanges

Nominal Pipe Size # Bolts or Studs Dia of Bolts or Studs Length of Stud
1/16 RF RTJ
1/2 4 0.50 3 3
3/4 4 0.63 3-1/2 3-1/2
1 4 0.63 3-1/2 3-1/2
1-1/4 4 0.63 3-3/4 3-3/4
1-1/2 4 0.75 4-1/4 4-1/4
2 8 0.63 4-1/4 4-1/4
2-1/2 8 0.75 4-3/4 4-3/4
3 8 0.75 5 5
3-1/2 8 0.88 5-1/2 5-1/2
4 8 0.88 5-3/4 5-3/4
5 8 1.00 6-1/2 6-1/2
6 12 1.00 6-3/4 6-3/4
8 12 1.13 7-1/2 7-3/4
10 16 1.25 8-1/2 8-1/2
12 20 1.25 8-3/4 8-3/4
14 20 1.38 9-1/4 9-1/4
16 20 1.50 10 10
18 20 1.63 10-3/4 10-3/4
20 24 1.63 11-1/4 11-1/2
24 24 1.88 13 13-1/4

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