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  • All dimensions are in inches.
  • These flanges will be supplied with a 1/16" raised face 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
26300WNSB
ASME B16.47 Class 300 Series B Welding Neck Flanges
ASME B16.47 Welding Neck Flange
28300WNSB
ASME B16.47 Class 300 Series B Welding Neck Flanges
ASME B16.47 Welding Neck Flange
30300WNSB
ASME B16.47 Class 300 Series B Welding Neck Flanges
ASME B16.47 Welding Neck Flange
32300WNSB
ASME B16.47 Class 300 Series B Welding Neck Flanges
ASME B16.47 Welding Neck Flange
34300WNSB
ASME B16.47 Class 300 Series B 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 34.12 in N/A 36.25 in N/A 39.00 in N/A 41.50 in N/A 43.62 in
Minimum Thickness (T) N/A 3.50 in N/A 3.50 in N/A 3.69 in N/A 4.06 in N/A 4.06 in
Raised Face Diameter (R) N/A 29.00 in N/A 31.00 in N/A 33.25 in N/A 35.50 in N/A 37.50 in
Length Thru Hub (Y) N/A 5.69 in N/A 5.88 in N/A 6.22 in N/A 6.62 in N/A 6.81 in
Hub Diameter (X) N/A 27.62 in N/A 29.75 in N/A 32.00 in N/A 34.00 in N/A 36.12 in
Minimum Fillet Radius (r) N/A 0.56 in N/A 0.56 in N/A 0.56 in N/A 0.62 in N/A 0.62 in
Top of Hub (A) N/A 26.19 in N/A 28.19 in N/A 30.25 in N/A 32.25 in N/A 34.25 in
Bore (B) N/A Specified by purchaser
Bolt Circle (C) N/A 31.62 in N/A 33.75 in N/A 36.25 in N/A 38.50 in N/A 40.62 in
Number of Holes N/A 32 N/A 36 N/A 36 N/A 32 N/A 36
Diameter of Holes N/A 1.38 in N/A 1.38 in N/A 1.50 in N/A 1.62 in N/A 1.62 in
Approximate Weight N/A 400 lb N/A 450 lb N/A 550 lb N/A 685 lb N/A 750 lb