Stud Reference Charts for Cast Iron Flanges

The number, diameter and length of studs for cast iron flanges class 125 and 250

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The studs sizes for cast iron flanges class 125 and 250 can be found in the tables below. The sizes are for standard facing and standard pressure ratings flange to flange.

Cast Iron Flanges - Class 125

NPS
(in)
No. of
Studs
Diameter of Stud
(in)
Length of Stud
(in)
1/2 4 1/2 2-1/2
3/4 4 1/2 2-1/2
1 4 1/2 2-3/4
1-1/4 4 1/2 2-3/4
1-1/2 4 1/2 3
2 4 5/8 3-1/2
2-1/2 4 5/8 3-3/4
3 4 5/8 3-3/4
3-1/2 8 5/8 3-3/4
4 8 5/8 3-3/4
5 8 3/4 4
6 8 3/4 4-1/4
8 8 3/4 4-1/2
10 12 7/8 4-3/4
12 12 7/8 5
14 12 1 5-1/2
16 16 1 5-1/2

Cast Iron Flanges - Class 250

NPS
(in)
No. of
Studs
Diameter of Stud
(in)
Length of Stud
(in)
1/2 4 1/2 2-3/4
3/4 4 5/8 3-1/4
1 4 5/8 3-1/4
1-1/4 4 5/8 3-1/2
1-1/2 4 5/8 3-3/4
2 8 5/8 3-3/4
2-1/2 8 5/8 4-1/4
3 8 5/8 4-1/2
3-1/2 8 5/8 4-1/2
4 8 5/8 4-3/4
5 8 5/8 5
6 12 5/8 5
8 12 7/8 5-3/4
10 16 1 6-1/2
12 16 1-1/8 7
14 20 1-1/8 7-1/4
16 20 1-1/4 7-3/4
18 24 1-1/4 8

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