Cast Iron Flanges - ASME/ANSI Class 125

ASME/ANSI B16.1 Cast Iron Pipe Flanges and Flanged Fittings - Class 125 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts.

Cast Iron Flanges - ASME/ANSI 125 lb
1	4-1/4	4	5/8	3-1/8
1-1/4	4-5/8	4	5/8	3-1/2
1-1/2	5	4	5/8	3-7/8
2	6	4	3/4	4-3/4
2-1/2	7	4	3/4	5-1/2
3	7-1/2	4	3/4	6
3-1/2	8-1/2	8	3/4	7
4	9	8	3/4	7-1/2
5	10	8	7/8	8-1/2
6	11	8	7/8	9-1/2
8	13-1/2	8	7/8	11-3/4
10	16	12	1	14-1/4
12	19	12	1	17
14	21	12	1-1/8	18-3/4
16	23-1/2	16	1-1/8	21-1/4
18	25	16	1-1/4	22-3/4
20	27-1/2	20	1-1/4	25
24	32	20	1-3/8	29-1/2
30	38-3/4	28	1-3/8	36
36	46	32	1-5/8	42-3/4
42	53	36	1-5/8	49-1/2
48	59-1/2	44	1-5/8	56
54	66-1/4	44	2	62-3/4
60	73	52	2	69-1/4

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Cast Iron Flanges - ASME/ANSI Class 125

ASME/ANSI B16.1 Cast Iron Pipe Flanges and Flanged Fittings - Class 125 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts.

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Unit Converters

Cast Iron Flanges - ASME/ANSI 125 lb
Pipe Size (inches)	Outside Diameter (inches)	Number of Bolt Holes	Bolt Hole Diameter (inches)	Bolt Circle (inches)
1	4-1/4	4	5/8	3-1/8
1-1/4	4-5/8	4	5/8	3-1/2
1-1/2	5	4	5/8	3-7/8
2	6	4	3/4	4-3/4
2-1/2	7	4	3/4	5-1/2
3	7-1/2	4	3/4	6
3-1/2	8-1/2	8	3/4	7
4	9	8	3/4	7-1/2
5	10	8	7/8	8-1/2
6	11	8	7/8	9-1/2
8	13-1/2	8	7/8	11-3/4
10	16	12	1	14-1/4
12	19	12	1	17
14	21	12	1-1/8	18-3/4
16	23-1/2	16	1-1/8	21-1/4
18	25	16	1-1/4	22-3/4
20	27-1/2	20	1-1/4	25
24	32	20	1-3/8	29-1/2
30	38-3/4	28	1-3/8	36
36	46	32	1-5/8	42-3/4
42	53	36	1-5/8	49-1/2
48	59-1/2	44	1-5/8	56
54	66-1/4	44	2	62-3/4
60	73	52	2	69-1/4