Supplier and Manufacturer of Flanges

Alpha Overseas is a well-known manufacturer and supplier of flanges. Our company specialises in producing a wide variety of Industrial Flanges, NPT Flanges, and PN16 Flanges from 12"NB to 48"NB. We are therefore known as one of the top flanges manufacturers in India. We manufacture flanges of different shapes and sizes with different specifications for the customers’ requirements.

Flanges Manufacturers in Mumbai, Flange, Flanges Manufacturers in India, Flange Exporters India, Flanges Suppliers, Pipe Flange, Industrial Pipe Flanges, Flanges, ASME B16 5 Flange Dimensions, Custom Drawing Flanges Supplier in India.

Table Of Contents

• What are Flanges
• Flanges Material
• Flanges Specification
• Flanges Price List India
• Pipe Flange Types
  • Slip On Flange
  • Weld Neck Flange
  • Blind Flange
  • Threaded Flange
  • Socket weld Flange
  • Long Weld Neck Flange
  • Lap Joint Flange
  • Plate Flange
  • Orifice Flange
• Flange Dimensions
• Flange Weight Chart
• Available Stock of Flanges
• Flange Pressure Rating Chart
• Flanges Standard
• Applications of Flanges
• We Export Flanges Across the Globe
• Domestic Supply of Flanges

Flange types and sizes

The pipe size and the required pressure class for the application define the flange dimensions. Standard ANSI B16.5 flange dimensions range from 1/4 to 24 inches. According to publications from organizations like ASME, MSS, API, and others, flanges are standardized. Alpha overseas provides various flange sizes according to the client's requirements. Regardless of size, choosing the right flange design for your piping system and intended use can help to assure dependable performance, a long service life, and the best possible cost. Flanges can be joined in a variety of ways, such as by threading, welding, or bolting. Because it can maintain its seal, the threaded flange is ideal for low-pressure or smaller pipelines. The welded flange is preferred when your pipeline is larger or under high pressure. Due to the high pressure involved, a boiler room is one location where welded blind flanges may be utilized.

What are flanges?

Flanges and fittings, the second-most popular joining technique after welding, provide a dependable way to combine pipe systems with the numerous equipment, valves, and other elements of practically any processing system. Pipes are secured by external screws in flanged joints, which give additional joint stability for the transfer of substances under high pressure. When maintaining piping systems, flanges increase flexibility because they simplify the process of disassembling pipe systems and provide easy access to the components.

What is a flange used for?

As connectors in piping systems, flanges are used to join pipes to other pipes, tees, elbows, reducers, valves, and other piping equipment. They can also be used in other mechanical systems and in some cases they are used in construction as well. The flange provides a way to connect two sections of pipe together, allowing them to be bolted or welded in place

In pumps: Flanges are used to connect the pump body to the inlet and outlet piping, allowing for easy installation and maintenance of the pump. The flanges on the inlet and outlet of the pump provide a secure and leak-proof connection for the flow of liquids or gases.

Leak-proof connections: Flanges provide a secure and leak-proof connection between sections of pipe and other equipment, which is essential for the safe and efficient operation of the piping system.

Ensure Safety : Properly installed flanges ensure the safety of the piping system by preventing leaks and ensuring the proper alignment of the pipes and equipment.

What are the types of flanges?

Here are some examples of the most popular flange types: The same flange styles as ASME/ANSI flanges are available for DIN flanges such as Threaded, socket-welded, slip-on, lap joint, blind, and weld neck. In tubular wind turbine tower constructions, bolted ring-flange connections are the most popular kind of couplings. That is due, in part, to onshore towers' quick assembly during erection and simple disassembly at the end of their useful lives.

Flange Price List India

Check out the flanges price list.

Flanges Types

Flange Dimensions

ASME B16 5 Flange Dimensions

• 150
• 300
• 400
• 600
• 900
• 1500
• 2500

class 150 flange dimensions in mm

Nominal Pipe Size/ Bore for LWN	Outside Diameter	Min. Thickness	Diameter of Raised Face	Min. Thickness Lap Joint	Diameter of Hub	Diameter Beginning of Chamfer Welding Neck	Threaded Slip-on Socket Welding	Lapped	Welding Neck	Long Welding Neck	Minimum Thread Length Threaded	Minimum Slip-On Socket Welding	Minimum Lapped	Welding Neck / Socket Welding	Corner Bore Radius of Lapped Flange and Pipe	Depth of Socket	Bolt Circle Dia	Number of Holes	Diameter of Holes
J	O	tf	R	tf	X	A	Y1	Y2	Y3	Y4	T	B1	B2	B3	r	D
½	3.50	0.38	1.38	0.44	1.19	0.84	0.56	0.62	1.81	9.00	0.62	0.88	0.90	Note-3	0.12	0.38	2.38	4	0.63
¾	3.88	0.44	1.69	0.50	1.50	1.05	0.56	0.62	2.00	9.00	0.62	1.09	1.11	Note-3	0.12	0.44	2.75	4	0.63
1	4.25	0.50	2.00	0.56	1.94	1.32	0.62	0.69	2.12	9.00	0.69	1.36	1.38	Note-3	0.12	0.50	3.12	4	0.63
1¼	4.62	0.56	2.50	0.62	2.31	1.66	0.75	0.81	2.19	9.00	0.81	1.70	1.72	Note-3	0.19	0.56	3.50	4	0.63
1½	5.00	0.62	2.88	0.69	2.56	1.90	0.81	0.88	2.38	9.00	0.88	1.95	1.97	Note-3	0.25	0.62	3.88	4	0.63
2	6.00	0.69	3.62	0.75	3.06	2.38	0.94	1.00	2.44	9.00	1.00	2.44	2.46	Note-3	0.31	0.69	4.75	4	0.75
2½	7.00	0.81	4.12	0.88	3.56	2.88	1.06	1.12	2.69	9.00	1.12	2.94	2.97	Note-3	0.31	0.75	5.50	4	0.75
3	7.50	0.88	5.00	0.94	4.25	3.50	1.12	1.19	2.69	9.00	1.19	3.57	3.60	Note-3	0.38	0.81	6.00	4	0.75
3½	8.50	0.88	5.50	0.94	4.81	4.00	1.19	1.25	2.75	9.00	1.25	4.07	4.10	Note-3	0.38	-	7.00	8	0.75
4	9.00	0.88	6.19	0.94	5.31	4.50	1.25	1.31	2.94	Note-3	1.31	4.57	4.60	Note-3	0.44	-	7.50	8	0.75
5	10.00	0.88	7.31	0.94	6.44	5.56	1.38	1.44	3.44	12.00	1.44	5.66	5.69	Note-3	0.44	-	8.50	8	0.88
6	11.00	0.94	8.50	1.00	7.56	6.63	1.50	1.56	3.44	12.00	1.56	6.72	6.75	Note-3	0.50	-	9.50	8	0.88
8	13.50	1.06	10.62	1.12	9.69	8.63	1.69	1.75	3.94	12.00	1.75	8.72	8.75	Note-3	0.50	-	11.75	8	0.88
10	16.00	1.12	12.75	1.19	12.00	10.75	1.88	1.94	3.94	12.00	1.94	10.88	10.92	Note-3	0.50	-	14.25	12	1.00
12	19.00	1.19	15.00	1.25	14.38	12.75	2.12	2.19	4.44	12.00	2.19	12.88	12.92	Note-3	0.50	-	17.00	12	1.00
14	21.00	1.31	16.25	1.38	15.75	14.00	2.19	3.12	4.94	12.00	2.25	14.14	14.18	Note-3	0.50	-	18.75	12	1.13
16	23.50	1.38	18.50	1.44	18.00	16.00	2.44	3.44	4.94	12.00	2.50	16.16	16.19	Note-3	0.50	-	21.25	16	1.13
18	25.00	1.50	21.00	1.56	19.88	18.00	2.62	3.81	5.44	12.00	2.69	18.18	18.20	Note-3	0.50	-	22.75	16	1.25
20	27.50	1.62	23.00	1.69	22.00	20.00	2.81	4.06	5.62	12.00	2.88	20.20	20.25	Note-3	0.50	-	25.00	20	1.25
22	29.50	1.75	25.25	1.81	24.00	22.00	3.06	4.25	5.82	12.00	-	22.22	22.25	Note-3	0.50	-	27.25	20	1.38
24	32.00	1.81	27.25	1.88	26.12	24.00	3.19	4.38	5.94	12.00	3.25	24.25	24.25	Note-3	0.50	-	29.50	20	1.38
Notes: (1) This dimension is for the large end of the hub, which may be straight or tapered. Taper shall not exceed 7 deg on threaded, slip-on, socket-welding, and lapped flanges. (2) When these flanges are required with flat face, the flat face may be either the full tf dimension thickness plus 0.06 in. or the tf dimension thickness without the raised face height. (3) To be specified by the Customer; Y4 - the length can be 9" (B16.5) or 12" (industry), shall be specified by the customer.

class 300 flange dimensions in mm

Nominal Pipe Size/ Bore for LWN	Outside Diameter	Min. Thickness	Diameter of Raised Face	Min. Thickness Lap Joint	Diameter of Hub	Diameter Beginning of Chamefer Welding Neck	Threaded Slip-on Socket Welding	Lapped	Welding Neck	Long Welding Neck	Minimum Thread Length Threaded	Minimum Slip-On Socket Welding	Minimum Lapped	Welding Neck / Socket Welding	Corner Bore Radius of Lapped Flange and Pipe	Depth of Socket	Minimum Counter-bore Threaded Flange	Bolt Circle Dia	Number of Holes	Diameter of Holes
J	O	tf	R	tf	X	A	Y1	Y2	Y3	Y4	T	B1	B2	B3	r	D	Q
½	3.75	0.50	1.38	0.56	1.50	0.84	0.81	0.88	2.00	9.00	0.62	0.88	0.90	Note-3	0.12	0.38	0.93	2.62	4	0.63
¾	4.62	0.56	1.69	0.62	1.88	1.05	0.94	1.00	2.19	9.00	0.62	1.09	1.11	Note-3	0.12	0.44	1.14	3.25	4	0.75
1	4.88	0.62	2.00	0.69	2.12	1.32	1.00	1.06	2.38	9.00	0.69	1.36	1.38	Note-3	0.12	0.50	1.41	3.50	4	0.75
1¼	5.25	0.69	2.50	0.75	2.50	1.66	1.00	1.06	2.50	9.00	0.81	1.70	1.72	Note-3	0.19	0.56	1.75	3.88	4	0.75
1½	6.12	0.75	2.88	0.81	2.75	1.90	1.13	1.19	2.63	9.00	0.88	1.95	1.97	Note-3	0.25	0.62	1.98	4.50	4	0.88
2	6.50	0.81	3.62	0.88	3.31	2.38	1.25	1.31	2.69	9.00	1.12	2.44	2.46	Note-3	0.31	0.69	2.50	5.00	8	0.75
2½	7.50	0.94	4.12	1.00	3.94	2.88	1.44	1.50	2.94	9.00	1.25	2.94	2.97	Note-3	0.31	0.75	3.00	5.88	8	0.88
3	8.25	1.06	5.00	1.12	4.62	3.50	1.63	1.69	3.06	9.00	1.25	3.57	3.60	Note-3	0.38	0.81	3.63	6.62	8	0.88
3½	9.00	1.12	5.50	1.19	5.25	4.00	1.69	1.75	3.13	9.00	1.44	4.07	4.10	Note-3	0.38	-	4.13	7.25	8	0.88
4	10.00	1.19	6.19	1.25	5.75	4.50	1.82	1.88	3.32	Note-3	1.44	4.57	4.60	Note-3	0.44	-	4.63	7.88	8	0.88
5	11.00	1.31	7.31	1.38	7.00	5.56	1.94	2.00	3.82	12.00	1.69	5.66	5.69	Note-3	0.44	-	5.69	9.25	8	0.88
6	12.50	1.38	8.50	1.44	8.12	6.63	2.00	2.06	3.82	12.00	1.81	6.72	6.75	Note-3	0.50	-	6.75	10.62	12	0.88
8	15.00	1.56	10.62	1.62	10.25	8.63	2.38	2.44	4.32	12.00	2.00	8.72	8.75	Note-3	0.50	-	8.75	13.00	12	1.00
10	17.50	1.81	12.75	1.88	12.62	10.75	2.56	3.75	4.56	12.00	2.19	10.88	10.92	Note-3	0.50	-	10.88	15.25	16	1.13
12	20.50	1.94	15.00	2.00	14.75	12.75	2.82	4.00	5.06	12.00	2.38	12.88	12.92	Note-3	0.50	-	12.94	17.75	16	1.25
14	23.00	2.06	16.25	2.12	16.75	14.00	2.94	4.38	5.56	12.00	2.50	14.14	14.18	Note-3	0.50	-	14.19	20.25	20	1.25
16	25.50	2.19	18.50	2.25	19.00	16.00	3.19	4.75	5.69	12.00	2.69	16.16	16.19	Note-3	0.50	-	16.19	22.50	20	1.38
18	28.00	2.31	21.00	2.38	21.00	18.00	3.44	5.12	6.19	12.00	2.75	18.18	18.20	Note-3	0.50	-	18.19	24.75	24	1.38
20	30.50	2.44	23.00	2.50	23.12	20.00	3.69	5.50	6.32	12.00	2.88	20.20	20.25	Note-3	0.50	-	20.19	27.00	24	1.38
22	33.00	2.56	25.25	2.62	25.25	22.00	3.94	5.69	6.44	12.00	-	22.22	22.25	Note-3	0.50	-	-	29.25	24	1.63
24	36.00	2.69	27.25	2.75	27.62	24.00	4.13	6.00	6.56	12.00	3.25	24.25	24.25	Note-3	0.50	-	24.19	32.00	24	1.63
Notes: (1) This dimension is for the large end of the hub, which may be straight or tapered. Taper shall not exceed 7 deg on threaded, slip-on, socket-welding, and lapped flanges. (2) When these flanges are required with flat face, the flat face may be either the full tf dimension thickness plus 0.06 in. or the tf dimension thickeness without the raised face height. (3) To be specified by the Customer; Y4 - the length can be 9" (B16.5) or 12" (industry),shall be specified by the customer.

class 400 flange dimensions

Nominal Pipe Size/ Bore for LWN	Outside Diameter	Min. Thickness	Diameter of Raised Face	Diameter of Hub	Diameter Beginning of Chamefer Welding Neck	Threaded Slip-on Socket Welding	Lapped	Welding Neck	Long Welding Neck	Minimum Thread Length Threaded	Minimum Slip-On Socket Welding	Minimum Lapped	Welding Neck / Socket Welding	Corner Bore Radius of Lapped Flange and Pipe	Depth of Socket	Minimum Counter-bore Threaded Flange	Bolt Circle Dia	Number of Holes	Diameter of Holes
J	O	tf	R	X	A	Y1	Y2	Y3	Y4	T	B1	B2	B3	r	D	Q
½	3.75	0.56	1.38	1.50	0.84	0.88	0.88	2.06	9.00	0.62	0.88	0.90	Note-3	0.12	0.38	0.93	2.62	4	0.63
¾	4.62	0.62	1.69	1.88	1.05	1.00	1.00	2.25	9.00	0.62	1.09	1.11	Note-3	0.12	0.44	1.14	3.25	4	0.75
1	4.88	0.69	2.00	2.12	1.32	1.06	1.06	2.44	9.00	0.69	1.36	1.38	Note-3	0.12	0.50	1.41	3.50	4	0.75
1¼	5.25	0.81	2.50	2.50	1.66	1.12	1.12	2.62	9.00	0.81	1.70	1.72	Note-3	0.19	0.56	1.75	3.88	4	0.75
1½	6.12	0.88	2.88	2.75	1.90	1.25	1.25	2.75	9.00	0.88	1.95	1.97	Note-3	0.25	0.62	1.99	4.50	4	0.88
2	6.50	1.00	3.62	3.31	2.38	1.44	1.44	2.88	9.00	1.12	2.44	2.46	Note-3	0.31	0.69	2.50	5.00	8	0.75
2½	7.50	1.12	4.12	3.94	2.88	1.62	1.62	3.12	9.00	1.25	2.94	2.97	Note-3	0.31	0.75	3.00	5.88	8	0.88
3	8.25	1.25	5.00	4.62	3.50	1.81	1.81	3.25	9.00	1.38	3.57	3.60	Note-3	0.38	0.81	3.63	6.62	8	0.88
3½	9.00	1.38	5.50	5.25	4.00	1.94	1.94	3.38	9.00	1.56	4.07	4.10	Note-3	0.38	-	4.13	7.25	8	1.00
4	10.00	1.38	6.19	5.75	4.50	2.00	2.00	3.50	Note-3	1.44	4.57	4.60	Note-3	0.44	-	4.63	7.88	8	1.00
5	11.00	1.50	7.31	7.00	5.56	2.12	2.12	4.00	12.00	1.69	5.66	5.69	Note-3	0.44	-	5.69	9.25	8	1.00
6	12.50	1.62	8.50	8.12	6.63	2.25	2.25	4.06	12.00	1.81	6.72	6.75	Note-3	0.50	-	6.75	10.62	12	1.00
8	15.00	1.88	10.62	10.25	8.63	2.69	2.69	4.62	12.00	2.00	8.72	8.75	Note-3	0.50	-	8.75	13.00	12	1.13
10	17.50	2.12	12.75	12.62	10.75	2.88	4.00	4.88	12.00	2.19	10.88	10.92	Note-3	0.50	-	10.88	15.25	16	1.25
12	20.50	2.25	15.00	14.75	12.75	3.12	4.25	5.38	12.00	2.38	12.88	12.92	Note-3	0.50	-	12.94	17.75	16	1.38
14	23.00	2.38	16.25	16.75	14.00	3.31	4.62	5.88	12.00	2.50	14.14	14.18	Note-3	0.50	-	14.19	20.25	20	1.38
16	25.50	2.50	18.50	19.00	16.00	3.69	5.00	6.00	12.00	2.69	16.16	16.19	Note-3	0.50	-	16.19	22.50	20	1.50
18	28.00	2.62	21.00	21.00	18.00	3.88	5.38	6.50	12.00	2.75	18.18	18.20	Note-3	0.50	-	18.19	24.75	24	1.50
20	30.50	2.75	23.00	23.12	20.00	4.00	5.75	6.62	12.00	2.88	20.20	20.25	Note-3	0.50	-	20.19	27.00	24	1.63
22	33.00	2.88	25.25	25.25	22.00	4.25	6.00	6.75	12.00	-	22.22	22.25	Note-3	0.50	-	-	29.25	24	1.75
24	36.00	3.00	27.25	27.62	24.00	4.50	6.25	6.88	12.00	3.25	24.25	24.25	Note-3	0.50	-	24.19	32.00	24	1.88
Notes: (1) This dimension is for the large end of the hub, which may be straight or tapered. Taper shall not exceed 7 deg on threaded, slip-on, socket-welding, and lapped flanges. (2) When these flanges are required with flat face, the flat face may be either the full tf dimension thickness plus 0.06 in. or the tf dimension thickeness without the raised face height. (3) To be specified by the Customer; Y4 - the length can be 9" (B16.5) or 12" (industry), shall be specified by the customer.

class 600 flange dimensions in mm

Nominal Pipe Size/ Bore for LWN	Outside Diameter	Min. Thickness	Diameter of Raised Face	Diameter of Hub	Diameter Beginning of Chamefer Welding Neck	Threaded Slip-on Socket Welding	Lapped	Welding Neck	Long Welding Neck	Minimum Thread Length Threaded	Minimum Slip-On Socket Welding	Minimum Lapped	Welding Neck / Socket Welding	Corner Bore Radius of Lapped Flange and Pipe	Depth of Socket	Minimum Counter-bore Threaded Flange	Bolt Circle Dia	Number of Holes	Diameter of Holes
J	O	tf	R	X	A	Y1	Y2	Y3	Y4	T	B1	B2	B3	r	D	Q
½	3.75	0.56	1.38	1.50	0.84	0.88	0.88	2.06	9.00	0.62	0.88	0.90	Note-3	0.12	0.38	0.93	2.62	4	0.63
¾	4.62	0.62	1.69	1.88	1.05	1.00	1.00	2.25	9.00	0.62	1.09	1.11	Note-3	0.12	0.44	1.14	3.25	4	0.75
1	4.88	0.69	2.00	2.12	1.32	1.06	1.06	2.44	9.00	0.69	1.36	1.38	Note-3	0.12	0.50	1.41	3.50	4	0.75
1¼	5.25	0.81	2.50	2.50	1.66	1.12	1.12	2.62	9.00	0.81	1.70	1.72	Note-3	0.19	0.56	1.75	3.88	4	0.75
1½	6.12	0.88	2.88	2.75	1.90	1.25	1.25	2.75	9.00	0.88	1.95	1.97	Note-3	0.25	0.62	1.99	4.50	4	0.88
2	6.50	1.00	3.62	3.31	2.38	1.44	1.44	2.88	9.00	1.12	2.44	2.46	Note-3	0.31	0.69	2.50	5.00	8	0.75
2½	7.50	1.12	4.12	3.94	2.88	1.62	1.62	3.12	9.00	1.25	2.94	2.97	Note-3	0.31	0.75	3.00	5.88	8	0.88
3	8.25	1.25	5.00	4.62	3.50	1.81	1.81	3.25	9.00	1.38	3.57	3.60	Note-3	0.38	0.81	3.63	6.62	8	0.88
3½	9.00	1.38	5.50	5.25	4.00	1.94	1.94	3.38	9.00	1.56	4.07	4.10	Note-3	0.38	-	4.13	7.25	8	1.00
4	10.75	1.50	6.19	6.00	4.50	2.12	2.12	4.00	Note-3	1.62	4.57	4.60	Note-3	0.44	-	4.63	8.50	8	1.00
5	13.00	1.75	7.31	7.44	5.56	2.38	2.38	4.50	12.00	1.88	5.66	5.69	Note-3	0.44	-	5.69	10.50	8	1.12
6	14.00	1.88	8.50	8.75	6.63	2.62	2.62	4.62	12.00	2.00	6.72	6.75	Note-3	0.50	-	6.75	11.50	12	1.12
8	16.50	2.19	10.62	10.75	8.63	3.00	3.00	5.25	12.00	2.25	8.72	8.75	Note-3	0.50	-	8.75	13.75	12	1.25
10	20.00	2.50	12.75	13.50	10.75	3.38	4.38	6.00	12.00	2.56	10.88	10.92	Note-3	0.50	-	10.88	17.00	16	1.38
12	22.00	2.62	15.00	15.75	12.75	3.62	4.62	6.12	12.00	2.75	12.88	12.92	Note-3	0.50	-	12.94	19.25	20	1.38
14	23.75	2.75	16.25	17.00	14.00	3.69	5.00	6.50	12.00	2.88	14.14	14.18	Note-3	0.50	-	14.19	20.75	20	1.50
16	27.00	3.00	18.50	19.50	16.00	4.19	5.50	7.00	12.00	3.06	16.16	16.19	Note-3	0.50	-	16.19	23.75	20	1.62
18	29.25	3.25	21.00	21.50	18.00	4.62	6.00	7.25	12.00	3.12	18.18	18.20	Note-3	0.50	-	18.19	25.75	20	1.75
20	32.00	3.50	23.00	24.00	20.00	5.00	6.50	7.50	12.00	3.25	20.20	20.25	Note-3	0.50	-	20.19	28.50	24	1.75
22	34.25	3.75	25.25	26.25	22.00	5.25	6.88	7.75	12.00	-	22.22	22.25	Note-3	0.50	-	-	30.63	24	1.88
24	37.00	4.00	27.25	28.25	24.00	5.50	7.25	8.00	12.00	3.62	24.25	24.25	Note-3	0.50	-	24.19	33.00	24	2.00
Notes: (1) This dimension is for the large end of the hub, which may be straight or tapered. Taper shall not exceed 7 deg on threaded, slip-on, socket-welding, and lapped flanges. (2) When these flanges are required with flat face, the flat face may be either the full tf dimension thickness plus 0.06 in. or the tf dimension thickeness without the raised face height. (3) To be specified by the Customer; Y4 - the length can be 9" (B16.5) or 12" (industry), shall be specified by the customer.

class 900 flange dimensions in mm

Nominal Pipe Size/ Bore for LWN	Outside Diameter	Min. Thickness	Diameter of Raised Face	Diameter of Hub	Diameter Beginning of Chamefer Welding Neck	Threaded Slip-on Socket Welding	Lapped	Welding Neck	Long Welding Neck	Minimum Thread Length Threaded	Minimum Slip-On Socket Welding	Minimum Lapped	Welding Neck / Socket Welding	Corner Bore Radius of Lapped Flange and Pipe	Depth of Socket	Minimum Counter-bore Threaded Flange	Bolt Circle Dia	Number of Holes	Diameter of Holes
J	O	tf	R	X	A	Y1	Y2	Y3	Y4	T	B1	B2	B3	r	D	Q
½	4.75	0.88	1.38	1.50	0.84	1.25	1.25	2.38	9.00	0.88	0.88	0.90	Note-3	0.12	0.38	0.93	3.25	4	0.88
¾	5.12	1.00	1.69	1.75	1.05	1.38	1.38	2.75	9.00	1.00	1.09	1.11	Note-3	0.12	0.44	1.14	3.50	4	0.88
1	5.88	1.12	2.00	2.06	1.32	1.62	1.62	2.88	9.00	1.12	1.36	1.38	Note-3	0.12	0.50	1.41	4.00	4	1.00
1¼	6.25	1.12	2.50	2.50	1.66	1.62	1.62	2.88	9.00	1.19	1.70	1.72	Note-3	0.19	0.56	1.75	4.38	4	1.00
1½	7.00	1.25	2.88	2.75	1.90	1.75	1.75	3.25	9.00	1.25	1.95	1.97	Note-3	0.25	0.62	1.99	4.88	4	1.13
2	8.50	1.50	3.63	4.12	2.38	2.25	2.25	4.00	9.00	1.50	2.44	2.46	Note-3	0.31	0.69	2.50	6.50	8	1.00
2½	9.62	1.62	4.13	4.88	2.88	2.50	2.50	4.12	9.00	1.88	2.94	2.97	Note-3	0.31	0.75	3.00	7.50	8	1.13
3	9.50	1.50	5.00	5.00	3.50	2.12	2.12	4.00	9.00	1.62	3.57	3.60	Note-3	0.38	-	3.63	7.50	8	1.00
4	11.50	1.75	6.19	6.25	4.50	2.75	2.75	4.50	Note-3	1.88	4.57	4.60	Note-3	0.44	-	4.63	9.25	8	1.25
5	13.75	2.00	7.31	7.50	5.56	3.12	3.12	5.00	12.00	2.12	5.66	5.69	Note-3	0.44	-	5.69	11.00	8	1.38
6	15.00	2.19	8.50	9.25	6.63	3.38	3.38	5.50	12.00	2.25	6.72	6.75	Note-3	0.50	-	6.75	12.50	12	1.25
8	18.50	2.50	10.62	11.75	8.63	4.00	4.50	6.38	12.00	2.50	8.72	8.75	Note-3	0.50	-	8.75	15.50	12	1.50
10	21.50	2.75	12.75	14.50	10.75	4.25	5.00	7.25	12.00	2.81	10.88	10.92	Note-3	0.50	-	10.88	18.50	16	1.50
12	24.00	3.12	15.00	16.50	12.75	4.62	5.62	7.88	12.00	3.00	12.88	12.92	Note-3	0.50	-	12.94	21.00	20	1.50
14	25.25	3.38	16.25	17.75	14.00	5.12	6.12	8.38	12.00	3.25	14.14	14.18	Note-3	0.50	-	14.19	22.00	20	1.63
16	27.75	3.50	18.50	20.00	16.00	5.25	6.50	8.50	12.00	3.38	16.16	16.19	Note-3	0.50	-	16.19	24.25	20	1.75
18	31.00	4.00	21.00	22.25	18.00	6.00	7.50	9.00	12.00	3.50	18.18	18.20	Note-3	0.50	-	18.19	27.00	20	2.00
20	33.75	4.25	23.00	24.50	20.00	6.25	8.25	9.75	12.00	3.62	20.20	20.25	Note-3	0.50	-	20.19	29.50	20	2.13
24	41.00	5.50	27.25	29.50	24.00	8.00	10.50	11.50	12.00	4.00	24.25	24.25	Note-3	0.50	-	24.19	35.50	20	2.63
Notes: (1) This dimension is for the large end of the hub, which may be straight or tapered. Taper shall not exceed 7 deg on threaded, slip-on, socket-welding, and lapped flanges. (2) When these flanges are required with flat face, the flat face may be either the full tf dimension thickness plus 0.25 in. or the tf dimension thickeness without the raised face height. (3) To be specified by the Customer; Y4 - the length can be 9" (B16.5) or 12" (industry), shall be specified by the customer.

class 1500 flange dimensions in mm

Nominal Pipe Size/ Bore for LWN	Outside Diameter	Min. Thickness	Diameter of Raised Face	Diameter of Hub	Diameter Beginning of Chamefer Welding Neck	Threaded Slip-on Socket Welding	Lapped	Welding Neck	Long Welding Neck	Minimum Thread Length Threaded	Minimum Slip-On Socket Welding	Minimum Lapped	Welding Neck / Socket Welding	Corner Bore Radius of Lapped Flange and Pipe	Depth of Socket	Minimum Counter-bore Threaded Flange	Bolt Circle Dia	Number of Holes	Diameter of Holes
J	O	tf	R	X	A	Y1	Y2	Y3	Y4	T	B1	B2	B3	r	D	Q
½	4.75	0.88	1.38	1.50	0.84	1.25	1.25	2.38	9.00	0.88	0.88	0.90	Note-3	0.12	0.38	0.93	3.25	4	0.88
¾	5.12	1.00	1.69	1.75	1.05	1.38	1.38	2.75	9.00	1.00	1.09	1.11	Note-3	0.12	0.44	1.14	3.50	4	0.88
1	5.88	1.12	2.00	2.06	1.32	1.62	1.62	2.88	9.00	1.12	1.36	1.38	Note-3	0.12	0.50	1.41	4.00	4	1.00
1¼	6.25	1.12	2.50	2.50	1.66	1.62	1.62	2.88	9.00	1.19	1.70	1.72	Note-3	0.19	0.56	1.75	4.38	4	1.00
1½	7.00	1.25	2.88	2.75	1.90	1.75	1.75	3.25	9.00	1.25	1.95	1.97	Note-3	0.25	0.62	1.99	4.88	4	1.13
2	8.50	1.50	3.62	4.12	2.38	2.25	2.25	4.00	9.00	1.50	2.44	2.46	Note-3	0.31	0.69	2.50	6.50	8	1.00
2½	9.62	1.62	4.12	4.88	2.88	2.50	2.50	4.12	9.00	1.88	2.94	2.97	Note-3	0.31	0.75	3.00	7.50	8	1.13
3	10.50	1.88	5.00	5.25	3.50	-	2.88	4.62	9.00	-	-	3.60	Note-3	0.38	-	-	8.00	8	1.25
4	12.25	2.12	6.19	6.38	4.50	-	3.56	4.88	Note-3	-	-	4.60	Note-3	0.44	-	-	9.50	8	1.38
5	14.75	2.88	7.31	7.75	5.56	-	4.12	6.12	12.00	-	-	5.69	Note-3	0.44	-	-	11.50	8	1.63
6	15.50	3.25	8.50	9.00	6.63	-	4.69	6.75	12.00	-	-	6.75	Note-3	0.50	-	-	12.50	12	1.50
8	19.00	3.62	10.62	11.50	8.63	-	5.62	8.38	12.00	-	-	8.75	Note-3	0.50	-	-	15.50	12	1.75
10	23.00	4.25	12.75	14.50	10.75	-	7.00	10.00	12.00	-	-	10.92	Note-3	0.50	-	-	19.00	12	2.00
12	26.50	4.88	15.00	17.75	12.75	-	8.62	11.12	12.00	-	-	12.92	Note-3	0.50	-	-	22.50	16	2.13
14	29.50	5.25	16.25	19.50	14.00	-	9.50	11.75	12.00	-	-	14.18	Note-3	0.50	-	-	25.00	16	2.38
16	32.50	5.75	18.50	21.75	16.00	-	10.25	12.25	12.00	-	-	16.19	Note-3	0.50	-	-	27.75	16	2.63
18	36.00	6.38	21.00	23.50	18.00	-	10.88	12.88	12.00	-	-	18.20	Note-3	0.50	-	-	30.50	16	2.88
20	38.75	7.00	23.00	25.25	20.00	-	11.50	14.00	12.00	-	-	20.25	Note-3	0.50	-	-	32.75	16	3.13
24	46.00	8.00	27.25	30.00	24.00	-	13.00	16.00	12.00	-	-	24.25	Note-3	0.50	-	-	39.00	16	3.63
Notes: (1) This dimension is for the large end of the hub, which may be straight or tapered. Taper shall not exceed 7 deg on threaded, slip-on, socket-welding, and lapped flanges. (2) When these flanges are required with flat face, the flat face may be either the full tf dimension thickness plus 0.25 in. or the tf dimension thickeness without the raised face height. (3) To be specified by the Customer; Y4 - the length can be 9" (B16.5) or 12" (industry), shall be specified by the customer.

class 2500 flange dimensions

Nominal Pipe Size/ Bore for LWN	Outside Diameter	Min. Thickness	Diameter of Raised Face	Diameter of Hub	Hub Diameter Beginning of Chamefer Welding Neck	Threaded	Lapped	Welding Neck	Long Welding Neck	Minimum Thread Length Threaded	Minimum Lapped	Welding Neck	Corner Bore Radius of Lapped Flange and Pipe	Minimum Counter-bore Threaded Flange	Bolt Circle Dia	Number of Holes	Diameter of Holes
J	O	tf	R	X	A	Y1	Y2	Y3	Y4	T	B2	B3	r	Q
½	5.25	1.19	1.38	1.69	0.84	1.56	1.56	2.88	9.00	1.12	0.90	Note-3	0.12	0.93	3.50	4	0.88
¾	5.50	1.25	1.69	2.00	1.05	1.69	1.69	3.12	9.00	1.25	1.11	Note-3	0.12	1.14	3.75	4	0.88
1	6.25	1.38	2.00	2.25	1.32	1.88	1.88	3.50	9.00	1.38	1.38	Note-3	0.12	1.41	4.25	4	1.00
1¼	7.25	1.50	2.50	2.88	1.66	2.06	2.06	3.75	9.00	1.50	1.72	Note-3	0.19	1.75	5.12	4	1.13
1½	8.00	1.75	2.88	3.12	1.90	2.38	2.38	4.38	9.00	1.75	1.97	Note-3	0.25	1.99	5.75	4	1.25
2	9.25	2.00	3.62	3.75	2.38	2.75	2.75	5.00	9.00	2.00	2.46	Note-3	0.31	2.50	6.75	8	1.13
2½	10.50	2.25	4.12	4.50	2.88	3.12	3.12	5.62	9.00	2.25	2.97	Note-3	0.31	3.00	7.75	8	1.25
3	12.00	2.62	5.00	5.25	3.50	-	3.62	6.62	9.00	-	3.60	Note-3	0.38	-	9.00	8	1.38
4	14.00	3.00	6.19	6.50	4.50	-	4.25	7.50	Note-3	-	4.60	Note-3	0.44	-	10.75	8	1.63
5	16.50	3.62	7.31	8.00	5.56	-	5.12	9.00	12.00	-	5.69	Note-3	0.44	-	12.75	8	1.88
6	19.00	4.25	8.50	9.25	6.63	-	6.00	10.75	12.00	-	6.75	Note-3	0.50	-	14.50	8	2.13
8	21.75	5.00	10.63	12.00	8.63	-	7.00	12.50	12.00	-	8.75	Note-3	0.50	-	17.25	12	2.13
10	26.50	6.50	12.75	14.75	10.75	-	9.00	16.50	12.00	-	10.92	Note-3	0.50	-	21.25	12	2.63
12	30.00	7.25	15.00	17.38	12.75	-	10.00	18.25	12.00	-	12.92	Note-3	0.50	-	24.38	12	2.88
Notes: (1) This dimension is for the large end of the hub, which may be straight or tapered. Taper shall not exceed 7 deg on threaded, slip-on, socket-welding, and lapped flanges. (2) When these flanges are required with flat face, the flat face may be either the full tf dimension thickness plus 0.06 in. or the tf dimension thickeness without the raised face height. (3) To be specified by the Customer; Y4 - the length can be 9" (B16.5) or 12" (industry),shall be specified by the customer.

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