Cast Iron Flanges - ASME/ANSI Class 250

ASME/ANSI B16.1 Cast Iron Pipe Flanges and Flanged Fittings - Class 250 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts.

Cast Iron Flanges - ASME/ANSI 250 lb
1	4-7/8	4	3/4	3-1/2
1-1/4	5-1/4	4	3/4	3-7/8
1-1/2	6-1/8	4	7/8	4-1/2
2	6-1/2	8	3/4	5
2-1/2	7-1/2	8	7/8	5-7/8
3	8-1/4	8	7/8	6-5/8
3-1/2	9	8	7/8	7-1/4
4	10	8	7/8	7-7/8
5	11	8	7/8	9-1/4
6	12-1/2	12	7/8	10-5/8
8	15	12	1	13
10	17-1/2	16	1-1/8	15-1/4
12	20-1/2	16	1-1/4	17-3/4
14	23	20	1-1/4	20-1/4
16	25-1/2	20	1-3/8	22-1/2
18	28	24	1-3/8	24-3/4
20	30-1/2	24	1-3/8	27
24	36	24	1-5/8	32
30	43	28	2	39-1/4
36	50	32	2-1/4	46
42	57	36	2-1/4	52-3/4
48	65	40	2-1/4	60-3/4

Related Documents

ANSI - American National Standards Institute - ANSI provides a forum for development of American national standards.
ASME - American Society of Mechanical Engineers - ASME is one of the leading organizations in the world developing codes and standards.
ASME/ANSI B16 Standards for Pipes and Fittings - The ASME B16 standards covers pipes and fittings in cast iron , cast bronze, wrought copper and steel.
Cast Iron - The four basic types of cast iron - white iron, gray iron, ductile iron and malleable iron.
Cast Iron Flanged Pipe Fittings - Working Pressures vs. Temperature - Maximum working pressures for cast iron flanged pipe fittings according ANSI B16.1.
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 Class 25 - ASME/ANSI B16.1 - 1998 - Cast Iron Pipe Flanges and Flanged Fittings - Class 25 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts.
Cast Iron Flanges - Stud Reference Chart - The number, diameter and length of studs for cast iron flanges class 125 and 250.
Cast Iron Soil Pipes - Dimensions - Dimensions of cast iron soil pipes.
Cast Iron Threaded Pipe Fittings - Working Pressures vs. Temperature - Maximum working pressures for cast iron threaded pipe fittings according ANSI B16.4.

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Cast Iron Flanges - ASME/ANSI Class 250

ASME/ANSI B16.1 Cast Iron Pipe Flanges and Flanged Fittings - Class 250 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts.

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Cast Iron Flanges - ASME/ANSI 250 lb
Pipe Size (inches)	Outside Diameter (inches)	Number of Bolt Holes	Bolt Hole Diameter (inches)	Bolt Circle (inches)
1	4-7/8	4	3/4	3-1/2
1-1/4	5-1/4	4	3/4	3-7/8
1-1/2	6-1/8	4	7/8	4-1/2
2	6-1/2	8	3/4	5
2-1/2	7-1/2	8	7/8	5-7/8
3	8-1/4	8	7/8	6-5/8
3-1/2	9	8	7/8	7-1/4
4	10	8	7/8	7-7/8
5	11	8	7/8	9-1/4
6	12-1/2	12	7/8	10-5/8
8	15	12	1	13
10	17-1/2	16	1-1/8	15-1/4
12	20-1/2	16	1-1/4	17-3/4
14	23	20	1-1/4	20-1/4
16	25-1/2	20	1-3/8	22-1/2
18	28	24	1-3/8	24-3/4
20	30-1/2	24	1-3/8	27
24	36	24	1-5/8	32
30	43	28	2	39-1/4
36	50	32	2-1/4	46
42	57	36	2-1/4	52-3/4
48	65	40	2-1/4	60-3/4