Butt weld fittings

Butt weld fittings get their name from the method for which they attached to a piping system. Each end of a butt weld is beveled, and it is attached by butting the up to the adjoining pipe and along the bevel. This connection is both stronger and smoother than threaded or socket weld connections, making butt weld fittings the preferred product for critical applications.

is a full-line distributor of butt weld fittings, offering carbon steel, stainless steel, and exotic alloys. With sizes ranging from 1/4” to 48″,  can provide the butt weld fittings required for virturally any piping project.

Large quantites, custom sizes, and special alloys (Alloy 20, Monel, Hastelloy, Inconel, Titanium, etc) may be subject to a longer lead time for delivery.

Size Range: 1/4″ to 48″ Diameter
Types: 90, 45, 180, Tee, Cross, Ecc Reducer, Conc Reducer, Cap, Stub End, Lateral, Swage Nipples, Bull Plugs, Pipe Nipples
Schedules: 5, 10, 40 (STD), TRUE 40, 80 (XH), TRUE 80, 100, 120, 160, XXH
Carbon Steel: A234 WPB, Y52, Y60, Y65, Y70
Stainless Steel: 304, 310, 316, 321, 347
Exotic Alloys: A20, C276, Duplex 2205, AL6XN, A200, A600, Monel, Inconel, Incoloy

There are some need-to-know details when purchasing butt weld fittings, such as: diameter, schedule, material, the shape/type of the fitting, and whether it is seamless or welded construction (A234 WPB carbon steel butt weld fittings come seamless below 24”).

The schedule of the butt weld fitting must match the schedule of the butt weld fittings it is being welded to. These schedules are outlined in the butt weld fittings chart section of the website.

The following offers an in-depth view of the butt weld fitting material grades sold by Sunny Steel Supply. Each link below will provide the chemical composition, specifications, yield and tensile strength, as well as other specific product and grade information.

ASTM A234 – Wrought Carbon and Alloy Steel Butt Weld Fittings : This specification covers wrought carbon steel and alloy steel butt weld fittings of seamless and welded construction. This is the most common material for carbon steel butt weld fittings (specifically grade WPB) and is seamless up to 24”, where diameters of 24” or larger may come seamless or welded. These butt weld fittings are for use in pressure piping and in pressure vessel fabrication for service at moderate and elevated temperatures.
ASTM A860: This specification covers wrought high-strength ferritic steel butt weld fittings of seamless and electric fusion-welded construction covered by the latest revisions of B16.9 and MSS-SP-75. These butt weld fittings are for use in high-pressure gas and oil transmission and distribution systems.

A403 – Seamless and Welded Stainless Butt Weld Fittings: This specification covers the standard for seamless and welded wrought austenitic stainless steel butt weld fittings for pressure piping applications.

Special alloy butt weld fittings are used for applications that require more demanding performance, such as extreme and corrosive resistance. Each of the following exotic alloys provides unique attributes for such engineered applications. Applications for these alloys include, but are not limited to: chemical processing, chemical storage, pollution control, waste treatment, food processing, and pharmaceutical equipment.


Tees are butt weld fittings used to combine or divide flow, and Reducing Tees additionally allow for butt weld fittings size change. The run outlets of the tee are the two in-line outlets, and the branch is the third outlet. The branch outlet is the reducing outlet in a reducing tee.

An elbow is a butt weld fitting is used to change the direction of flow in a piping system, usually at the 90° or 45° angle. Like a reducing tee, reducing elbows also exist to simultaneously change flow direction and reduce flow diameter. 90 degree elbows are also available in both short radius and long radius patterns, whereas 45 degree elbows are only available as long radius.


A long radius butt weld elbow has a radius of curvature (Identified as “A” in the above drawing) is 1.5 times the nominal diameter, and a short radius butt weld elbow has a curvature that is 1.0 times the nominal diameter of the butt weld fitting. Long radius butt weld elbows give less frictional resistance to the fluid than the short radius butt weld elbows. Short radius butt weld elbows are generally cheaper and can be used where space is a concern, but they also create a greater pressure drop than long radius butt weld elbows.

Bend vs Elbow
There is often confusion around bends and elbows. Bends are generally made or fabricated as per the need of the piping design, whereas elbows are manufactured in mass quantities, conform to industry standard size specifications, and available off the shelf. Butt Weld Fitting bending techniques also face constraints regarding material thinning, and if not done properly, there can be concerns regarding the pressure integrity of the line being maintained. Elbows are most commonly used for SR and LR bends, but when the curvature exceeds 3R, bends are most commonly utilized.

Reducers are butt weld fittings used to facilitate a reduce the flow diameter in a piping system. Concentric reducers are most commonly used, as they create less friction for the fluid flow, however, eccentric reducers are utilized when space or alignment is a concern.

Crosses are a 4 way butt weld fitting, with 1 inlet and 3 outlets or vice versa. These are sometimes referred to as 4-way tees.

Caps are butt weld fittings used to terminate the flow, welding to the end of a butt weld fitting or pipe.

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