Comprehensive Guide to Flanges: Types, Materials, Sizes, and Standards

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Flange

Flange, which is called flange flange or flange. The flange is a part connected between the shaft and the shaft, used for the connection between the end of the pipe; Also useful in equipment inlet and outlet flange, used for connection between two equipment, such as reducer flange. Flange connection or flange joint, refers to the flange, gasket and bolt three mutually connected as a group of sealing structure detachable connection. Pipe flanges refer to the flanges used in pipe fittings and the import and export flanges used in equipment. There are holes in the flange, and the bolts make the two flanges tightly connected. The flanges are gasketed. Flange consists of threaded connection (thread connection) flange, welded flange and clamp flange

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Flange Standard	ASTM A182, ASTM A105, ASTM A234 WPB, A860,A694,AWWA C207
Flange Material	Carbon Steel Flange, Alloy Steel Flange, Stainless Steel Flange
Flange Sizes	1/2”-60” NPS (DN15-DN3000), SCH10,STD,SCH40,SCH60,XS,SCH80,SCH120,SCH160,XXS
Flange Class	Class150-Class2500
Flange Facing	RF/ FM/ M/ T G/ RF / FF / RTJ
Flange Types	Socket Weld Flange, Slip On Flange, Blind,Screwed Flange, Ring Joint Flange, Weld Neck Flange, Long Weld Neck Flange

Blind Flanges
Blind Flanges are round plates which have all relevant boltholes but lack a center hole and thus are used to close off the ends of a piping system or a pressure vessel opening.
Forged Steel Blind Flanges conform to ASTM A105 while Stainless Steel Flanges conform to ASTM A182.
Stocked in sizes from 1/2" to 24".
Available both with a flat face and a raised face.
Flanges of Class 150#, 300#, 600#, 900#, and 1500# are stocked.
Available in Carbon Steel as well as Stainless in grades 304L and 316L (L=low carbon).
Carbon Steel Flanges are available in both domestic and less expensive Imported versions. All Stainless Blind Flanges that we stock are imported.

Lap Joint Flanges
Lap Joint Flanges slide directly over a pipe and are used with Stub Ends. Typically, a pipe is welded to the Stub End leaving the Lap Joint Flange to rotate freely around the stub end, simplifying bolt hole alignment.

Lap Joint Flanges are forged steel and conform to ASTM A105.
Stocked in sizes from 1.50" to 20".
Forged Steel Lap Joint Flanges are available in both domestic and less expensive Imported versions.
Stub Ends are sold separately.

Slip On Flanges
Slip On Flanges are manufactured with an inside diameter that is slightly larger than the pipe's outside diameter and are connected to the pipe via fillet weld at the top and bottom of the flange.
Stocked in sizes from 1/2" to 24", depending on the material.
Aluminum Flanges conform to ASM 6061 T6.
Carbon Steel Slip On Flanges conform to ASTM A105.
Stainless Steel Slip On Flanges conform to ASTM A182. Both 304L and 316L available.
Available with both a Raised Face and a Flat Face.

Socket Weld Flanges
Socket Weld Flanges are often used on smaller sizes of high pressure pipe and are attached to that pipe by inserting the pipe into the socket end and applying fillet weld around the top. This results in a smooth bore with excellent flow characteristics.
Stocked in sizes from 1/2" to 6".
Carbon Steel Socket Weld Flanges conform to ASTM A105.
Stainless Flanges conform to ASTM A182. Both 304L and 316L available.
Classes available range from 150# to 1500#.

Threaded Flanges
Threaded Flanges have a bore with tapered threads and connect to pipes that have external threads. The primary benefit of Threaded Flanges is that no welding is required to attach them.

Stocked in sizes from 1/2" to 8".
Carbon Steel Threaded Flanges conform to ASTM A105.
Stainless Steel Threaded Flanges conform to ASTM A182. Both 304L and 316L available.
Classes available range from 150# to 1500#.

Weld Neck Flanges
Weld Neck Flanges are attached by welding a pipe to the neck of the flange, transferring stress from the flange itself to the connected pipe. They are often used in high pressure applications.
Stocked in sizes from 1/2" to 24".
Aluminum Weld Neck Flanges conform to ASM 6061 T6.
Carbon Steel Weld Neck Flanges conform to ASTM A105.
High Yield Weld Neck Flanges conform to ASTM A694 F52.
Stainless Steel Weld Neck Flanges conform to ASTM A182. Both 304L and 316L available.
Classes available range from 150# to 1500#.

CLASS 150 According to ASTM A/SA-105; ANSI B16.5
Nominal Pipe Size	Outside Diam. of Flange (O)	Thick. Flange (C)	Diam.of Raised Face (R)	Diam. at Base (X)	Length (Y)	Min. Length (T)	Min. Bore (Q)	No. of	Diam. of	Diam. of	Diam. Circle	Approx. Weight (in Pounds)
½	3.5	0.44	1.38	1.19	0.62	0.62		4	0.62	0.5	2.38	1
¾	3.88	0.5	1.69	1.5	0.62	0.62		4	0.62	0.5	2.75	2
1	4.25	0.56	2	1.94	0.69	0.69		4	0.62	0.5	3.12	2
1 ¼	4.62	0.62	2.5	2.31	0.81	0.81		4	0.62	0.5	3.5	3
1 ½	5	0.69	2.88	2.56	0.88	0.88		4	0.62	0.5	3.88	3
2	6	0.75	3.62	3.06	1	1		4	0.75	0.62	4.75	5
2 ½	7	0.88	4.12	3.56	1.12	1.12		4	0.75	0.62	5.5	7
3	7.5	0.94	5	4.25	1.19	1.19		4	0.75	0.62	6	8
3 ½	8.5	0.94	5.5	4.81	1.25	1.25		8	0.75	0.62	7	11
4	9	0.94	6.19	5.31	1.31	1.31		8	0.75	0.62	7.5	13
5	10	0.94	7.31	6.44	1.44	1.44		8	0.88	0.75	8.5	15
6	11	1	8.5	7.56	1.56	1.56		8	0.88	0.75	9.5	19
8	13.5	1.12	10.62	9.69	1.75	1.75		8	0.88	0.75	11.75	30
10	16	1.19	12.75	12	1.94	1.94		12	1	0.88	14.25	43
12	19	1.25	15	14.38	2.19	2.19		12	1	0.88	17	64
14	21	1.38	16.25	15.75	2.25	2.25		12	1.12	1	18.75	90
16	23.5	1.44	18.5	18	2.5	2.5		16	1.12	1	21.25	98
18	25	1.56	21	19.88	2.69	2.69		16	1.25	1.13	22.75	130
20	27.5	1.69	23	22	2.88	2.88		20	1.25	1.12	25	165
24	32	1.88	27.25	26.12	3.25	3.25		20	1.38	1.25	29.5	220

CLASS 300 According to ASTM A/SA-105; ANSI B16.5
Nominal Pipe Size	Outside Diam. of Flange (O)	Thick. of Flange (C)	Diam. of Raised Face (R)	Diam. of Hub at Base (X)	Length thru Hub (Y)	Min. Thread Length (T)	Min. Counter Bore (Q)	No. of Holes	Diam. of Holes	Diam. of Bolts	Diam. of Bolt Circle	Approx. Weight (in Pounds)
1/2	3.75	0.56	1.38	1.5	0.88	0.62	0.93	4	0.62	0.5	2.62	2
3/4	4.62	0.62	1.69	1.88	1	0.62	1.14	4	0.75	0.62	3.25	3
1	4.88	0.69	2	2.12	1.06	0.69	1.41	4	0.75	0.62	3.5	3
1 1/4	5.25	0.75	2.5	2.5	1.06	0.81	1.75	4	0.75	0.62	3.88	4
1 1/2	6.12	0.81	2.88	2.75	1.19	0.88	1.99	4	0.88	0.75	4.5	6
2	6.5	0.88	3.62	3.31	1.31	1.12	2.5	8	0.75	0.62	5	7
2 1/2	7.5	1	4.12	3.94	1.5	1.25	3	8	0.88	0.75	5.88	10
3	8.25	1.12	5	4.62	1.69	1.25	3.63	8	0.88	0.75	6.62	13
3 1/2	9	1.19	5.5	5.25	1.75	1.44	4.13	8	0.88	0.75	7.25	17
4	10	1.25	6.19	5.75	1.88	1.44	4.63	8	0.88	0.75	7.88	22
5	11	1.38	7.31	7	2	1.69	5.69	8	0.88	0.75	9.25	28
6	12.5	1.44	8.5	8.12	2.06	1.81	6.75	12	0.88	0.75	10.62	39
8	15	1.62	10.62	10.25	2.44	2	8.75	12	1	0.88	13	58
10	17.5	1.88	12.75	12.62	2.62	2.19	10.88	16	1.12	1	15.25	81
12	20.5	2	15	14.75	2.88	2.38	12.94	16	1.25	1.12	17.75	115
14	23	2.12	16.25	16.75	3	2.5	14.19	20	1.25	1.12	20.25	165
16	25.5	2.25	18.5	19	3.25	2.69	16.19	20	1.38	1.25	22.5	190
18	28	2.38	21	21	3.5	2.75	18.19	24	1.38	1.25	24.75	250
20	30.5	2.5	23	23.12	3.75	2.88	20.19	24	1.38	1.25	27	315
24	36	2.75	27.25	27.62	4.19	3.25	24.19	24	1.62	1.5	32	475

CLASS 600 According to ASTM A/SA-105; ANSI B16.5
Nominal Pipe Size	Outside Diam. of Flange (O)	Thick.of Flange (C)	Diam. of Raised Face (R)	Diam. of Hub at Base (X)	Length thru Hub (Y)	Min. Thread Length (T)	Min. Counter Bore (Q)	No. of Holes	Diam. of Holes	Diam. of Bolts	Diam. of Bolt Circle	Approx. Weight (in Pounds)
1/2	3.75	0.56	1.38	1.5	0.88	0.62	0.93	4	0.62	0.5	2.62	2
3/4	4.62	0.62	1.69	1.88	1	0.62	1.14	4	0.75	0.62	3.25	3
1	4.88	0.69	2	2.12	1.06	0.69	1.41	4	0.75	0.62	3.5	4
1 1/4	5.25	0.81	2.5	2.5	1.12	0.81	1.75	4	0.75	0.62	3.88	5
1 1/2	6.12	0.88	2.88	2.75	1.25	0.88	1.99	4	0.88	0.75	4.5	7
2	6.5	1	3.62	3.31	1.44	1.12	2.5	8	0.75	0.62	5	9
2 1/2	7.5	1.12	4.12	3.94	1.62	1.25	3	8	0.88	0.75	5.88	13
3	8.25	1.25	5	4.62	1.81	1.38	3.63	8	0.88	0.75	6.62	16
3 1/2	9	1.38	5.5	5.25	1.94	1.56	4.13	8	1	0.88	7.25	21
4	10.75	1.5	6.19	6	2.12	1.62	4.63	8	1	0.88	8.5	37
5	13	1.75	7.31	7.44	2.38	1.88	5.69	8	1.12	1	10.5	63
6	14	1.88	8.5	8.75	2.62	2	6.75	12	1.12	1	11.5	80
8	16.5	2.19	10.62	10.75	3	2.25	8.75	12	1.25	1.12	13.75	115
10	20	2.5	12.75	13.5	3.38	2.56	10.88	16	1.38	1.25	17	170
12	22	2.62	15	15.75	3.62	2.75	12.94	20	1.38	1.25	19.25	200
14	23.75	2.75	16.25	17	3.69	2.88	14.19	20	1.5	1.38	20.75	230
16	27	3	18.5	19.5	4.19	3.06	16.19	20	1.62	1.5	23.75	330
18	29.25	3.25	21	21.5	4.62	3.12	18.19	20	1.75	1.63	25.75	400
20	32	3.5	23	24	5	3.25	20.19	24	1.75	1.62	28.5	510
24	37	4	27.25	28.25	5.5	3.62	24.19	24	2	1.88	33	730

CLASS 900According to ASTM A/SA-105; ANSI B16.5
Nominal Pipe Size	Outside Diam. of Flange (O)	Thick.of Flange (C)	Diam.of Raised Face (R)	Diam. of Hub at Base (X)	Length thru Hub (Y)	Min. Thread Length (T)	Min. Counter Bore (Q)	No. of Holes	Diam. of Holes	Diam. of Bolts	Diam. of Bolt Circle	Approx. Weight (in Pounds)
1/2	4.75	0.88	1.38	1.5	1.25	0.88	0.93	4	0.88	0.75	3.25	4
3/4	5.12	1	1.69	1.75	1.38	1	1.14	4	0.88	0.75	3.5	5
1	5.88	1.12	2	2.06	1.62	1.12	1.41	4	1	0.88	4	8
1 1/4	6.25	1.12	2.5	2.5	1.62	1.19	1.75	4	1	0.88	4.38	9
1 1/2	7	1.25	2.88	2.75	1.75	1.25	1.99	4	1.12	1	4.88	12
2	8.5	1.5	3.62	4.12	2.25	1.5	2.5	8	1	0.88	6.5	25
2 1/2	9.62	1.62	4.12	4.88	2.5	1.88	3	8	1.12	1	7.5	36
3	9.5	1.5	5	5	2.12	1.62	3.63	8	1	0.88	7.5	26
4	11.5	1.75	6.19	6.25	2.75	1.88	4.63	8	1.25	1.12	9.25	53
5	13.75	2	7.31	7.5	3.12	2.12	5.69	8	1.38	1.25	11	83
6	15	2.19	8.5	9.25	3.38	2.25	6.75	12	1.25	1.12	12.5	110
8	18.5	2.5	10.62	11.75	4	2.5	8.75	12	1.5	1.38	15.5	170
10	21.5	2.75	12.75	14.5	4.25	2.81	10.88	16	1.5	1.38	18.5	245
12	24	3.12	15	16.5	4.62	3	12.94	20	1.5	1.38	21	325
14	25.25	3.38	16.25	17.75	5.12	3.25	14.19	20	1.62	1.5	22	400
16	27.75	3.5	18.5	20	5.25	3.38	16.19	20	1.75	1.63	24.25	425
18	31	4	21	22.25	6	3.5	18.19	20	2	1.88	27	600
20	33.75	4.25	23	24.5	6.25	3.62	20.19	20	2.12	2	29.5	730
24	41	5.5	27.25	29.5	8	4	24.19	20	2.62	2.5	35.5	1400

CLASS 1500 According to ASTM A/SA-105; ANSI B16.5
Nominal Pipe Size	Outside Diam. of Flange (O)	Thick.of Flange (C)	Diam.of Raised Face (R)	Diam. of Hub at Base (X)	Length thru Hub (Y)	Min. Thread Length (T)	Min. Counter Bore (Q)	No. of Holes	Diam. of Holes	Diam. of Bolts	Diam. of Bolt Circle	Approx. Weight (in Pounds)
1/2	4.75	0.88	1.38	1.5	1.25	0.88	0.93	4	0.88	0.75	3.25	4
3/4	5.12	1	1.69	1.75	1.38	1	1.14	4	0.88	0.75	3.5	5
1	5.88	1.12	2	2.06	1.62	1.12	1.41	4	1	0.88	4	8
1 1/4	6.25	1.12	2.5	2.5	1.62	1.19	1.75	4	1	0.88	4.38	9
1 1/2	7	1.25	2.88	2.75	1.75	1.25	1.99	4	1.12	1	4.88	12
2	8.5	1.5	3.62	4.12	2.25	1.5	2.5	8	1	0.88	6.5	25
2 1/2	9.62	1.62	4.12	4.88	2.5	1.88	3	8	1.12	1	7.5	36

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will deal with a batch of extruded inventory at ultra-low prices from time to time. The products we deal with include steel pipes, steel plates, round bars, steel bars, steel coils, profiles, rails, wires, etc. Our purpose in dealing with inventory at low prices is to quickly monetize the goods for our daily expenses of steel production. Low-priced products are given priority to regular customers. If you are interested in low-priced steel, please contact us quickly.

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