Stub End

Stub End

A piping system is a diverse structure that is made up of various components. Each of these modules has its unique function, which helps connect various pipelines. Some of them provide strength to it, while others help influence the flow characteristics due to their unique make-up and physical structure. In this article, we will look at a stub end and see how it facilitates its usage across various systems.

These components are basically made with two mechanical parts making a short pipe. One of the parts is flared from the outside, while the other is prepared to be welded to a pipe with a similar nominal size and thickness. The items have threads on both parts. They are available in short or long sizes in lengths up to 80 inches. The items in this range are generally butt-weld fittings which are used to connect different components in the diverse piping industry.

What is stub end in welding?

The items in this range are welded using a butt-weld. This is a simple process that creates a strong seal and prevents any leakage. The weld helps this fitting to be fitted in several flanges and pipes. It can easily bind metal of dissimilar structures and thickness and connect their diaphragms together. The characteristics of flow in these components are uniform and travel without any obstructions.


These components are very versatile and are utilized in several applications. They are a preferred choice in high-pressure applications. It provides reliable sealing that allow the flow to be consistent. The modules are used in rotating back flanges that help in bolting. It is a lightweight item that enables users to reduce the overall weight of the structure. They are widely used in high-grade stainless steel, alloys, nickel, where weight plays a critical role. They are common in petroleum, construction, power supply, gas processing, shipbuilding, and other related industries. These ends also help in reducing the overall cost from the production to the final installation.

What is lap joint stub end?

Lap joints are mostly used in conjunction with these components. They can be used as an alternative method to make a flanged connection to weld neck flanges. It helps in bolting lengths of pipes together within the designated structure. They allow the ends to simply rotate on the pipe and align it using bolt holes. The items are widely used in both low and high-pressure applications. They provide excellent results across both these structural systems. The items are available in different finishes, namely in beveled, squared, flanged, and threaded tubing ends.

What is the difference between Type A and Type C stub ends?

These components are available in 3 types; type A, type B, and type C. Each of them has their own make-up and is designated to perform different functions. The first two types are very similar however the type C module is different from the lot.

Type A
The products in this range are used for standard lap joint flanges. The thickness of the lap in these items is greater or equal to the nominal pipe thickness. The inside corner is square in shape, while the outer corner radius can connect a machined or serrated lap joint flange.

Type C
The items can be used for slip-on flanges along with standard lap joint flanges. The component has a rounded interior giving it a rounded edge on its inside diameter. The lap thickness is 75% to the pipe wall, and the radius can be made into a square. It is small in size and cannot accommodate a backup flange or machined parts.

Manufacturing process

These items are produced by welding two parts. This process is time-consuming and may be subjected to defects if not inspected properly. They can be produced with an alternative method using rolling dies to form a seamless product. During this process, the metal is cut and heated, and shaped in desired structures in the absence of welds or seams.

MSS SP-43 vs ASME B16.9 Stub End

The components are available in two patterns. The main differentiating factor between both these modules is their length. An MSS SPP-43 end is a short pattern item, while the ASME B16.9 end follows the long pattern design.

Ramesh Steel Corporation