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  • All dimensions are in inches.
  • 1/4" raised face will be added to the thickness unless otherwise specified.
  • Flat face option available.

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ASME B16.47 Welding Neck Flange
Unit of Measure
Items ASME B16.47 Welding Neck Flange
26900WNSA
ASME B16.47 Class 900 Series A Welding Neck Flanges
ASME B16.47 Welding Neck Flange
28900WNSA
ASME B16.47 Class 900 Series A Welding Neck Flanges
ASME B16.47 Welding Neck Flange
30900WNSA
ASME B16.47 Class 900 Series A Welding Neck Flanges
ASME B16.47 Welding Neck Flange
32900WNSA
ASME B16.47 Class 900 Series A Welding Neck Flanges
ASME B16.47 Welding Neck Flange
34900WNSA
ASME B16.47 Class 900 Series A Welding Neck Flanges
Flange Type N/A Welding Neck
Nominal Pipe Size N/A 26 N/A 28 N/A 30 N/A 32 N/A 34
Outside Diameter (O) N/A 42.75 in N/A 46.00 in N/A 48.50 in N/A 51.75 in N/A 55.00 in
Minimum Thickness (T) N/A 5.50 in N/A 5.62 in N/A 5.88 in N/A 6.25 in N/A 6.50 in
Raised Face Diameter (R) N/A 29.50 in N/A 31.50 in N/A 33.75 in N/A 36.00 in N/A 38.00 in
Length Thru Hub (Y) N/A 11.25 in N/A 11.75 in N/A 12.25 in N/A 13.00 in N/A 13.75 in
Hub Diameter (X) N/A 30.50 in N/A 32.75 in N/A 35.00 in N/A 37.25 in N/A 39.62 in
Minimum Fillet Radius (r) N/A 0.44 in N/A 0.50 in N/A 0.50 in N/A 0.50 in N/A 0.56 in
Top of Hub (A) N/A 26.00 in N/A 28.00 in N/A 30.00 in N/A 32.00 in N/A 34.00 in
Bore (B) N/A Specified by purchaser
Approximate Weight N/A 1525 lb N/A 1810 lb N/A 2120 lb N/A 2545 lb N/A 2970 lb
Bolt Circle (C) N/A 37.50 in N/A 40.25 in N/A 42.75 in N/A 45.50 in N/A 48.25 in
Number of Holes N/A 20
Diameter of Holes N/A 2.88 in N/A 3.12 in N/A 3.12 in N/A 3.38 in N/A 3.62 in