Weld Neck Flanges

About

Weld neck flanges are used in piping systems that require a butt-welded flange connection. Their tapered hub provides a smooth transition from the flange to the pipe, which is why they are commonly specified for process piping, utility service, and other applications where connection integrity and dimensional consistency matter. PipingNow offers weld neck flanges in 150#, 300#, and 600# classes, with 304L stainless steel, 316L stainless steel, and 150# aluminum options available in this collection. Sizes range from 1/2 in through 24 in, with 10s, 40s, and 80s schedule options available across the product mix. Materials, Classes, and Schedules The 150# range includes both stainless steel and aluminum options, while the 300# and 600# ranges are available in stainless steel. 304L is commonly used for general stainless applications, while 316L is often selected where additional corrosion resistance is required. Schedule also plays an important role, since the flange bore needs to correspond with the pipe being installed. Classes: 150#, 300#, and 600# Materials: 304L stainless steel, 316L stainless steel, and aluminum Schedules: 10s, 40s, and 80s Sizes: 1/2 in through 24 in Typical Applications These are commonly used on process lines, plant piping, utility systems, skids, and fabricated assemblies where a butt-welded flange is called for by design. In stainless systems, they are often selected where the material, pressure class, and bore need to align closely with the rest of the piping specification. process piping plant and utility systems fabricated skids and assemblies stainless piping installations applications requiring schedule-specific bores systems designed around butt-welded flange connections What to Check Before Ordering Pressure class, nominal size, material, and schedule should all be confirmed before ordering. The flange bore needs to match the pipe correctly, and the facing and mating flange details should also be verified. If one of those specifications