300lb. ASME B16.5 WELDING NECK FLANGE

Common Diameters and Wall Thicknesses

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2 1/2" Class 300 Raised Face - Welding Neck ASME B16.5
Nominal size   Outside diam. of flange Thick. of flange Diam. of raised face Diam. of hub at base Diam. of hub at point of welding Length thru hub No. of holes Diam. of holes Diam. of bolts Diam. of bolt circle Approx. weight pounds/Kg
O C R X A Y
2 1/2" in. 7.50 1 4.12 3.94 2.88 3 8 0.88 3/4 5.88 12
mm. 190.5 25.4 104.6 100.1 73.2 76.2 22.4 19.1 149.4 5

150 lb. and 300 lb. flanges have a 1/16" raised face which is included in the Thicknesses C and the Length Y.
400 lb. through 900 lb. flanges have a 1/4" raised face which is not included in C or Y.
Call Lynco at 1-800-749-5539 for further assistance.


  • Flange Bores & Dimensions Chart (1)
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