Forged Steel Flanges - Stud Reference Charts

The number, diameter and length of studs for ANSI forged steel flanges Class 150 to Class 1500

The studs sizes for ANSI forged steel flanges 150 lb, 300 lb, 400 lb, 600 lb, 900 lb and 1500 lb can be found in the tables below. The sizes are for standard facing and standard pressure ratings flange to flange.

Forged Steel Flanges - Class 150

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
18 16 1-1/8 6
20 20 1-1/8 6-1/2
24 20 1-1/4 7

Forged Steel Flanges - Class 300

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 3/4 3-3/4
2 8 5/8 3-3/4
2-1/2 8 3/4 4-1/4
3 8 3/4 4-1/2
3-1/2 8 3/4 4-1/2
4 8 3/4 4-3/4
5 8 3/4 5
6 12 3/4 5
8 12 7/8 5-3/4
10 16 1 6-1/2
12 16 1 7
14 20 1-1/8 7-1/4
16 20 1-1/4 7-3/4
18 24 1-1/4 8
20 24 1-1/4 8-1/4
24 24 1-1/4 9-1/4

Forged Steel Flanges - Class 400

NPS
(in)
No. of
Studs
Diameter of Stud
(in)
Length of Stud
(in)
1/2 4 1/2 3-1/4
3/4 4 5/8 3-3/4
1 4 5/8 3-3/4
1-1/4 4 5/8 4
1-1/2 4 3/4 4-1/2
2 8 5/8 4-1/2
2-1/2 8 3/4 5
3 8 3/4 5-1/4
3-1/2 8 7/8 5-3/4
4 8 7/8 5-3/4
5 8 7/8 6
6 12 7/8 6-1/4
8 12 1 7
10 16 1-1/8 7-3/4
12 16 1-1/4 8-1/4
14 20 1-1/4 8-1/2
16 20 1-3/8 9
18 24 1-3/8 9-1/4
20 24 1-1/2 9-3/4
24 24 1-3/4 10-3/4

Forged Steel Flanges - Class 600

NPS
(in)
No. of
Studs
Diameter of Stud
(in)
Length of Stud
(in)
1/2 4 1/2 3-1/4
3/4 4 5/8 3-3/4
1 4 5/8 3-3/4
1-1/4 4 5/8 4
1-1/2 4 3/4 4-1/2
2 8 5/8 4-1/2
2-1/2 8 3/4 5
3 8 3/4 5-1/4
3-1/2 8 7/8 5-3/4
4 8 7/8 6
5 8 1 6-3/4
6 12 1 7
8 12 1-1/8 7-3/4
10 16 1-1/4 8-3/4
12 20 1-1/4 9
14 20 1-3/8 9-1/2
16 20 1-1/2 10-1/4
18 20 1-5/8 11
20 24 1-5/8 11-1/2
24 24 1-7/8 13

Forged Steel Flanges - Class 900

NPS
(in)
No. of
Studs
Diameter of Stud
(in)
Length of Stud
(in)
1/2 4 3/4 4-1/2
3/4 4 3/4 4-3/4
1 4 7/8 5-1/4
1-1/4 4 7/8 5-1/4
1-1/2 4 1 5-3/4
2 8 7/8 6
2-1/2 8 1 6-1/2
3 8 7/8 6
4 8 1-1/8 7
5 8 1-1/4 7-3/4
6 12 1-1/8 7-3/4
8 12 1-3/8 9
10 16 1-3/8 9-1/2
12 20 1-3/8 10-1/4
14 20 1-1/2 11
16 20 1-5/8 11-1/2
18 20 1-7/8 13
20 20 2 14
24 20 2-1/2 17-1/2

Forged Steel Flanges - Class 1500

NPS
(in)
No. of
Studs
Diameter of Stud
(in)
Length of Stud
(in)
1/2 4 3/4 4-1/2
3/4 4 3/4 4-3/4
1 4 7/8 5-1/4
1-1/4 4 7/8 5-1/4
1-1/2 4 1 5-3/4
2 8 7/8 6
2-1/2 8 1 6-1/2
3 8 1-1/8 7-1/4
4 8 1-1/4 8
5 8 1-1/2 10
6 12 1-3/8 10-1/2
8 12 1-5/8 11-3/4
10 12 1-7/8 13-1/2
12 16 2 15
14 16 2-1/4 16-1/2
16 16 2-1/2 18
18 16 2-3/4 19-1/2
20 16 3 21-1/2
24 16 3-1/2 24-1/2

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