ANSI B16.1 CLASS 250 WELD NECK FLANGES

ANSI B16.1 Class 250 Weld Neck Flange Dimensions

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Nominal Size	Outside Diameter (OD)	Thickness (T)	Raised Face Dia. (R)	Diameter at Base (X)	Bore - SO (B)	LTH - Weld Neck (L2)	Drilling - Bolt Circle (BC)	Drilling - Hole Diameter	Drilling - No. of Holes	Weight - Weld Neck (lbs)	Weight - Slip-on (lbs)	Weight - Blind (lbs)	* Bore - WN (B2)
26	38.25	2.81	32.44	30.5	26.25	5.81	34.5	1.88	28	534	531	916	*
28	40.75	2.94	34.94	33	28.25	5.94	37	1.88	28	629	637	1095	*
30	43	3	37.19	35.25	30.25	6	39.25	1.88	28	702	707	1236	*
32	45.25	3.12	39.44	37.5	32.25	6.12	41.5	1.88	28	793	801	1424	*
34	47.5	3.25	41.44	39.5	34.25	6.25	43.5	1.88	28	882	889	1649	*
36	50	3.38	43.69	41.5	36.25	6.38	46	2.13	32	969	970	1884	*
38	52.25	3.44	45.69	43.5	38.25	6.44	48	2.13	32	1057	1062	2094	*
40	54.25	3.56	47.94	45.75	40.25	6.56	50.25	2.13	36	1158	1172	2336	*
42	57	3.69	50.44	47.75	42.25	6.94	52.75	2.125	36	1318	1288	2673	*
44	59.25	3.75	52.69	49.75	44.25	7	55	2.13	36	1423	1397	2935	*
46	61.5	3.88	54.94	51.75	46.25	7.12	57.25	2.13	40	1536	1510	3272	*
48	65	4	58.44	54	48.25	7.25	60.75	2.13	40	1824	1797	3768	*

*To be specified by the customer

Notes:
Dimensions are in inches.
ANSI B16.1 is a gray iron pipe flange and fitting specification.
Steel flanges are occasionally produced to mate up with Class 125 and Class 250 valves
These flange dimensions are provided for reference even though specification does not cover steel.
These flanges are typically supplied with a flat face.

Advantages of using ANSI B16.1 Class 250 Weldneck Flanges

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Weldneck flanges offer several advantages over other types of flanges, such as slip-on flanges. Here are some of the benefits of using weldneck flanges:

Superior Strength
Weldneck flanges have a long tapered hub that provides additional strength to the connection between the pipe and the flange. The welding process creates a permanent and durable bond that can withstand high pressure and extreme temperatures.

Versatility in Accommodating Different Pipe Sizes
Weldneck flanges are available in various sizes, making them suitable for use with pipes of different diameters. The flanges can also be used with pipes of different materials, such as stainless steel, carbon steel, and alloy steel.

Secure and Leak-Free Connection
The welding process creates a strong and leak-free connection between the pipe and the flange. This ensures that the piping system is safe and efficient, reducing the risk of leaks and other safety hazards.

Easy to Install and Maintain
Weldneck flanges are relatively easy to install, and the welding process can be completed quickly. The flanges are also easy to maintain, requiring only periodic inspection and maintenance to ensure that they are in good working condition.

Applications of ANSI B16.1 Class 250 Weldneck Flange

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Weldneck flanges are used in various industrial piping applications, including:

Oil and Gas Industry
Weldneck flanges are commonly used in oil and gas piping systems, where they are used to transport crude oil, natural gas, and other petroleum products.

Chemical Processing Industry
Weldneck flanges are used in chemical processing plants to transport various chemicals and materials.

Water Treatment Industry
Weldneck flanges are used in water treatment plants to transport water and other fluids.

Power Generation Industry
Weldneck flanges are used in power generation plants to transport steam, gas, and other fluids.

Price List of Weldneck Flanges

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Prices for ANSI B16.1 Class 250 Weldneck Flanges are very affordable.

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WELD NECK FLANGE ANSI / ASME B16.1

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ANSI B16.1 Class 125 Weld Neck Flange

ANSI B16.1 Class 250 Weld Neck Flange