300lb. ASME B16.5 WELDING NECK FLANGE

Common Diameters and Wall Thicknesses

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3" Class 300 Flat Faced - 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
3" in. 8.25 1.12 5.00 4.62 3.5 3.12 8 0.88 3/4 6.62 15
mm. 209.6 28.4 127 117.3 88.9 79.2 22.4 19.1 168.1 7

* Flat face flanges may be either the full thickness of the flange or the thickness with the raised face removed. It should be noted that removal of the raised face produces a non-standard length through the hub.
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.


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