ASME B16.47 Series A Class 300 Flanges | Welding Neck

We are a manufacturer, supplier and exporter of ASME B16.47 Series A Class 300 Welding Neck Flanges. Designed for large diameter piping systems, ASME B16.47 Series A flanges are capable of withstanding Class 300 pressure ratings and are suitable for large diameter pipes from NPS 26 to NPS 60. The design of the Welding Neck flange provides superior strength and stability, enabling it to withstand heavier pipe loads, making it ideal for use in more demanding industrial applications.

YANHAO ASME B16.47 Series A Class 300 Welding Neck Flanges are manufactured from premium materials such as stainless steel, carbon steel and alloy steel. The standard flanges we offer meet the needs of most industrial applications; we also provide custom services to meet customer needs for special types and apertures of flanges. If you have specific technical specifications or design requirements, please feel free to contact our professional team and we will provide you with a personalized solution.

Class 300 dimensions | ASME B16.47 Series A Flange

  • All dimensions are in inches.
  • These flanges will be furnished with a 1/16″ raised face unless otherwise specified.
  • Standard Bore will be furnished unless otherwise specified.
Nominal Pipe SizeOutside Diameter (O)Bolt Circle (W)Raised Face Diameter (R)Number of HolesDiameter of HolesBore (B)Top of Hub (A)Hub Diameter (X)Minimum Fillet Radius (r)Minimum Thickness (T)Length Thru Hub (Y)Approximate Weight (lbs)
2638.2534.5029.50281.75Specified by purchaser26.0028.380.383.127.25605
2840.7537.0031.50281.75Specified by purchaser28.0030.500.443.387.75745
3043.0039.2533.75281.88Specified by purchaser30.0032.560.443.628.25870
3245.2541.5036.00282.00Specified by purchaser32.0034.690.443.888.751005
3447.5043.5038.00282.00Specified by purchaser34.0036.880.504.009.121145
3650.0046.0040.25322.12Specified by purchaser36.0039.000.504.129.501275
3846.0043.0040.50321.62Specified by purchaser38.0039.120.504.257.12695
4048.7545.5042.75321.75Specified by purchaser40.0041.250.504.507.62840
4250.7547.5044.75321.75Specified by purchaser42.0043.250.504.697.88950
4453.2549.7547.00321.88Specified by purchaser44.0045.250.504.888.121055
4655.7552.0049.00282.00Specified by purchaser46.0047.380.505.068.501235
4857.7554.0051.25322.00Specified by purchaser48.0049.380.505.258.811380
5060.2556.2553.50322.12Specified by purchaser50.0051.380.505.509.121530
5262.2558.2555.50322.12Specified by purchaser52.0053.380.505.699.381660
5465.2561.0057.75282.38Specified by purchaser54.0055.500.506.009.942050
5667.2563.0059.75282.38Specified by purchaser56.0057.620.506.0610.252155
5869.2565.0062.00322.38Specified by purchaser58.0059.620.506.2510.502270
6071.2567.0064.00322.38Specified by purchaser60.0061.620.506.4410.752470

Weld Neck Flange

Weld Neck Flange is a type of industrial pipe connection, especially used in pressure pipeline systems. Thanks to the high structural strength, sealing performance, corrosion resistance, and the characteristics of withstanding high temperature and pressure of the welding neck flange, it can be used for oil transportation pipelines, ship pipeline systems, and the transportation of raw materials in chemical plants, etc.

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FAQ

Any butt-weld fitting or weld-neck flange can be directly welded to any other butt-weld fitting or weld-neck flange without the need for any extra piece of pipe (Pup piece) between them.

The Weld Neck Flange offers increased strength under higher pressures, subzero or elevated temperatures that cause line expansion or retraction, or other variable forces. The Slip On Flange is connected to the pipe by two welds, one on the back side of the Flange and one on the inside of the Flange.

Weld Neck Flanges, It gives the highest level of joint integrity as it is butt-welded with a pipe. These types of flanges are used in high-pressure and temperature application.

Any butt-weld fitting or weld-neck flange can be directly welded to any other butt-weld fitting or weld-neck flange without the need for any extra piece of pipe (Pup piece) between them.

The Weld Neck Flange offers increased strength under higher pressures, subzero or elevated temperatures that cause line expansion or retraction, or other variable forces. The Slip On Flange is connected to the pipe by two welds, one on the back side of the Flange and one on the inside of the Flange.

Weld Neck Flanges, It gives the highest level of joint integrity as it is butt-welded with a pipe. These types of flanges are used in high-pressure and temperature application.