Product Description: 

API Spec 6A, 6B weld neck flange, does not have full bores, they have restricted bores that match nominal pipe sizes. As an example, 4-1/16" 5M, 6B flange has a maximum bore of 3.47" approximating the I.D. of 4 inch schedule 160 line pipe, 4-1/2" O.D. 

API Spec 6A does not specify Over All Length of 6BX Weld Neck Flange, but instead provides dimensions of specific portions of the flange, with tolerance, that manufacturers must add together, along with an undefined weld bevel, to achieve a length. Consider any length for API 6BX Weld Neck Flange shown on this website as an approximate length.

Weld Neck Flanges are flanges with the wall thickness of the flange having the same dimensions of the matching pipe, the lighter the pipe is, the larger the bore, conversely, the heavier the pipe, the smaller the bore, they are normally used for high pressure, cold or hot temperature.

Flange Direct provides our clients with ASME Code and other international standard Industrial flanges for the Oil and Gas / Petrochemical, Waterworks and other industries. We supply ANSI, API, AWWA pipe flanges in carbon, stainless, alloys and chrome steel. Flange Types include Weld Neck flanges, Slip on flanges, Blind flanges, Threaded flange, socket weld flanges, Lap Joint flanges, Orifice Flanges in sizes 1/2" to 198" and other customs flanges in various sizes.

Weld Neck Flange - Dimensions