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  • All dimensions are in inches.
  • These flanges will be furnished with a 1/16" raised face unless otherwise specified.
  • Flat face option available.

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Industry Standard Welding Neck Flange
Unit of Measure
Items Industry Standard Welding Neck Flange
26175WNIS
Industry Standard Class 175 Welding Neck Flanges
Industry Standard Welding Neck Flange
28175WNIS
Industry Standard Class 175 Welding Neck Flanges
Industry Standard Welding Neck Flange
30175WNIS
Industry Standard Class 175 Welding Neck Flanges
Industry Standard Welding Neck Flange
32175WNIS
Industry Standard Class 175 Welding Neck Flanges
Industry Standard Welding Neck Flange
34175WNIS
Industry Standard Class 175 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 31.50 in N/A 33.50 in N/A 35.75 in N/A 37.75 in N/A 40.25 in
Thickness (T) N/A 1.38 in N/A 1.38 in N/A 1.38 in N/A 1.38 in N/A 1.50 in
Raised Face Diameter (R) N/A 29.00 in N/A 31.00 in N/A 33.25 in N/A 35.25 in N/A 37.38 in
Length Thru Hub (Y) N/A 3.38 in N/A 3.38 in N/A 3.63 in N/A 3.63 in N/A 3.75 in
Diameter of Hub at Bevel (A) N/A Specified by purchaser
Base of Hub Diameter (X) N/A 27.63 in N/A 29.63 in N/A 31.88 in N/A 33.88 in N/A 35.88 in
Bore (B) N/A Specified by purchaser
Approximate Weight N/A 120 lb N/A 130 lb N/A 150 lb N/A 160 lb N/A 195 lb
Bolt Circle (C) N/A 29.88 in N/A 31.88 in N/A 34.13 in N/A 36.13 in N/A 38.38 in
Number of Holes N/A 28 N/A 28 N/A 36 N/A 36 N/A 36
Diameter of Bolt Holes N/A 0.88 in N/A 0.88 in N/A 0.88 in N/A 0.88 in N/A 1.00 in