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Stud Reference Charts

Choose one of the following:

CI Flanges Class 125	CI Flanges Class 250	FS Flanges 150 lb.
FS Flanges 300 lb.	FS Flanges 400 lb.	FS Flanges 600 lb.
FS Flanges 900 lb.	FS Flanges 1500 lb.	FS Flanges 2500 lb.

Use these charts to determine the number and the size of studs you may need. The length listed is the overall length and is intended for Flange to Flange - Standard Facing and Standard Pressure ratings.

Cast Iron Flanges Class 125 Return to Flange options

Pipe Size	No. of Studs	Dia. x Length
1/2	4	1/2 x 2-1/2
3/4	4	1/2 x 2-1/2
1	4	1/2 x 2-3/4
1-1/4	4	1/2 x 2-3/4
1-1/2	4	1/2 x 3
2	4	5/8 x 3-1/2
2-1/2	4	5/8 x 3-3/4
3	4	5/8 x 3-3/4
3-1/2	8	5/8 x 3-3/4
4	8	5/8 x 3-3/4
5	8	3/4 x 4
6	8	3/4 x 4-1/4
8	8	3/4 x 4-1/2
10	12	7/8 x 4-3/4
12	12	7/8 x 5
14	12	1 x 5-1/2
16	16	1 x 5-1/2
18	16	1-1/8 x 6
20	20	1-1/8 x 6-1/2
24	20	1-1/4 x 7

Cast Iron Flanges Class 250 Return to Flange options

Pipe Size	No. of Studs	Dia. x Length
1/2	4	1/2 x 2-3/4
3/4	4	5/8 x 3-1/4
1	4	5/8 x 3-1/4
1-1/4	4	5/8 x 3-1/2
1-1/2	4	3/4 x 3-3/4
2	8	5/8 x 3-3/4
2-1/2	8	3/4 x 4-1/4
3	8	3/4 x 4-1/2
3-1/2	8	3/4 x 4-1/2
4	8	3/4 x 4-3/4
5	8	3/4 x 5
6	12	3/4 x 5
8	12	7/8 x 5-3/4
10	16	1 x 6-1/2
12	16	1-1/8 x 7
14	20	1-1/8 x 7-1/4
16	20	1-1/4 x 7-3/4
18	24	1-1/4 x 8
20	24	1-1/4 x 8-1/4
24	24	1-1/2 x 9-1/4

Forged Steel Flanges 150 lb. Return to Flange options

Pipe Size	No. of Studs	Dia. x Length
1/2	4	1/2 x 2-1/2
3/4	4	1/2 x 2-1/2
1	4	1/2 x 2-3/4
1-1/4	4	1/2 x 2-3/4
1-1/2	4	1/2 x 3
2	4	5/8 x 3-1/2
2-1/2	4	5/8 x 3-3/4
3	4	5/8 x 3-3/4
3-1/2	8	5/8 x 3-3/4
4	8	5/8 x 3-3/4
5	8	3/4 x 4
6	8	3/4 x 4-1/4
8	8	3/4 x 4-1/2
10	12	7/8 x 4-3/4
12	12	7/8 x 5
14	12	1 x 5-1/2
16	16	1 x 5-1/2
18	16	1-1/8 x 6
20	20	1-1/8 x 6-1/2
24	20	1-1/4 x 7

Forged Steel Flanges 300 lb. Return to Flange options

Pipe Size	No. of Studs	Dia. x Length
1/2	4	1/2 x 2-3/4
3/4	4	5/8 x 3-1/4
1	4	5/8 x 3-1/4
1-1/4	4	5/8 x 3-1/2
1-1/2	4	3/4 x 3-3/4
2	8	5/8 x 3-3/4
2-1/2	8	3/4 x 4-1/4
3	8	3/4 x 4-1/2
3-1/2	8	3/4 x 4-1/2
4	8	3/4 x 4-3/4
5	8	3/4 x 5
6	12	3/4 x 5
8	12	7/8 x 5-3/4
10	16	1 x 6-1/2
12	16	1-1/8 x 7
14	20	1-1/8 x 7-1/4
16	20	1-1/4 x 7-3/4
18	24	1-1/4 x 8
20	24	1-1/4 x 8-1/4
24	24	1-1/2 x 9-1/4

Forged Steel Flanges 400 lb. Return to Flange options

Pipe Size	No. of Studs	Dia. x Length
1/2	4	1/2 x 3-1/4
3/4	4	5/8 x 3-3/4
1	4	5/8 x 3-3/4
1-1/4	4	5/8 x 4
1-1/2	4	3/4 x 4-1/2
2	8	5/8 x 4-1/2
2-1/2	8	3/4 x 5
3	8	3/4 x 5-1/4
3-1/2	8	7/8 x 5-3/4
4	8	7/8 x 5-3/4
5	8	7/8 x 6
6	12	7/8 x 6-1/4
8	12	1 x 7
10	16	1-1/8 x 7-3/4
12	16	1-1/4 x 8-1/4
14	20	1-1/4 x 8-1/2
16	20	1-3/8 x 9
18	24	1-3/8 x 9-1/4
20	24	1-1/2 x 9-3/4
24	24	1-3/4 x 10-3/4

Forged Steel Flanges 600 lb. Return to Flange options

Pipe Size	No. of Studs	Dia. x Length
1/2	4	1/2 x 3-1/4
3/4	4	5/8 x 3-3/4
1	4	5/8 x 3-3/4
1-1/4	4	5/8 x 4
1-1/2	4	3/4 x 4-1/2
2	8	5/8 x 4-1/2
2-1/2	8	3/4 x 5
3	8	3/4 x 5-1/4
3-1/2	8	7/8 x 5-3/4
4	8	7/8 x 6
5	8	1 x 6-3/4
6	12	1 x 7
8	12	1-1/8 x 7-3/4
10	16	1-1/4 x 8-3/4
12	20	1-1/4 x 9
14	20	1-3/8 x 9-1/2
16	20	1-1/2 x 10-1/4
18	20	1-5/8 x 11
20	24	1-5/8 x 11-1/2
24	24	1-7/8 x 13

Forged Steel Flanges 900 lb. Return to Flange options

Pipe Size	No. of Studs	Dia. x Length
1/2	4	3/4 x 4-1/2
3/4	4	3/4 x 4-3/4
1	4	7/8 x 5-1/4
1-1/4	4	7/8 x 5-1/4
1-1/2	4	1 x 5-3/4
2	8	7/8 x 6
2-1/2	8	1 x 6-1/2
3	8	7/8 x 6
3-1/2
4	8	1-1/8 x 7
5	8	1-1/4 x 7-3/4
6	12	1-1/8 x 7-3/4
8	12	1-3/8 x 9
10	16	1-3/8 x 9-1/2
12	20	1-3/8 x 10-1/4
14	20	1-1/2 x 11
16	20	1-5/8 x 11-1/2
18	20	1-7/8 x 13
20	20	2 x 14
24	20	2-1/2 x 17-1/2

Forged Steel Flanges 1500 lb. Return to Flange options

Pipe Size	No. of Studs	Dia. x Length
1/2	4	3/4 x 4-1/2
3/4	4	3/4 x 4-3/4
1	4	7/8 x 5-1/4
1-1/4	4	7/8 x 5-1/4
1-1/2	4	1 x 5-3/4
2	8	7/8 x 6
2-1/2	8	1 x 6-1/2
3	8	1-1/8 x 7-1/4
3-1/2
4	8	1-1/4 x 8
5	8	1-1/2 x 10
6	12	1-3/8 x 10-1/2
8	12	1-5/8 x 11-3/4
10	12	1-7/8 x 13-1/2
12	16	2 x 15
14	16	2-1/4 x 16-12
16	16	2-1/2 x 18
18	16	2-3/4 x 19-12
20	16	3 x 21-1/2
24	16	3-1/2 x 24-1/2

Forged Steel Flanges 2500 lb. Return to Flange options

Pipe Size	No. of Studs	Dia. x Length
1/2	4	3/4 x 5
3/4	4	3/4 x 5-1/4
1	4	7/8 x 5-3/4
1-1/4	4	1 x 6-1/4
1-1/2	4	1-1/8 x 7
2	8	1 x 7-1/4
2-1/2	8	1-1/8 x 8
3	8	1-1/4 x 9
3-1/2
4	8	1-1/2 x 10-1/4
5	8	1-3/4 x 12
6	12	2 x 14
8	12	2 x 15-1/2
10	12	2-1/2 x 19-1/2
12	12	2-3/4 x 21-1/2
14
16
18
20
24

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Disclaimer
This information is provided "as is" and OnlinePipe makes no warranty of any kind with respect to the subject matter or accuracy of the information contained herein. OnlinePipe specifically disclaims all warranties, expressed, implied or otherwise, including without limitation, all warranties of merchantability and fitness for a particular purpose. In no event shall OnlinePipe be liable for any special, incidental, indirect or consequential damages of any kind or any damages whatsoever resulting from loss of use, data, profits, whether or not advised of the possibility of damage, and on any theory of liability, arising out of or in connection with the use of the information contained herein.This publication may include technical inaccuracies or typographical errors. Changes may be periodically made to the information herein.

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