Forged Steel Fittings

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Forged Steel fittings get their name from the process used to make them, that being Forging. This process of forging, heats carbon steel that is placed between dies, which molds the heated piece of steel into its desired shape. This shape is then bored and machined into a forged steel fitting.

Forged steel fittings create leak-free connections, and therefore, they are commonly used for transporting hazardous or corrosive materials. MSI is a distributor forged steel fittings, offering carbon steel, stainless steel, and exotic alloys. Call MSI Supply for Bonney Forge Fittings and more.

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MSI Supply can often provide the forged steel fittings listed below for a same-day delivery.  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: 1/8" - 4"
Types: 90, 45, Tee, Cross, Coupling, Reducing Coupling, Bushing, Cap, O'Let
Rating: 2000 - 6000
Carbon Steel: A105
Stainless Steel: 304, 310, 316, 321, 347
Exotic Alloys: Alloy 20, Hastelloy C276, Duplex 2205, Duplex 2507, Monel, Inconel, Incoloy 800, Incoloy 825


Ordering Information

There are some need-to-know details when purchasing forged steel fittings, such as: diameter, pressure rating, material, the shape/type of the fforged steel itting, and the end connection. There is no need to specify seamless/welded construction, because these forged steel fittings are forged and do not come welded.


Carbon & Stainless

  • Standard Carbon Forged Steel Fittings (A105): ASTM A105 is an ASTM specification dealing with forged carbon steel piping components
  • Stainless Forged Steel Fittings (A182): This specification covers forged or rolled alloy and stainless steel (304, 304L, 316L) forged steel fittings. This spec also covers other alloys including chrome (i.e. A182 F11)

Forged Steel Fitting Shapes/Types

Forged steel fittings are manufactured in a number of shapes: 


Tees are a forged steel fitting used to combine or divide process flow, and Reducing Tees additionally allow for pipe 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.

forged steel tees in threaded and socket weld


A pipe elbow is a forged steel itting installed between two lengths of pipe or tube allowing a change of direction, usually in the 90° or 45° direction. Similar to a reducing tee, reducing elbows also exist to simultaneously change flow direction and reduce flow diameter.  Street Elbows have one female end to accept pipe and another male end thread that is the same size as the pipe and can avoid the use of a pipe nipple during installation.

forged steel elbows in threaded and socket weld


Couplings are a forged steel fitting used to connect two lengths of pipe, and Half-coupling is screwed onto the pipe, while the other end is made to be tightly inserted, or welded, onto the other end to pipe or vessel. 

Standard Couplings have female threads or open sockets at both ends, whereas reducing couplings connect smaller pipes to larger ones.

forged steel couplings threaded and socket weld


Unions are a forged steel fitting similar to a coupling but allow a convenient disconnection and connection; it has 3 parts: a nut, a female end, and a male end.  They allow two lengths of pipe to be assembled and detached without causing any deformation to the pipes.

forged steel unions


Reducing inserts and Bushings are forged steel fittings that allow for a change in pipe size.  Pictured here is the hex head bushing, which is most commonly used.

forged steel bushings


Caps are forged steel fittings used to terminate the flow, inserting over the end of the pipe

forged steel caps



Similar to a cap, plugs are forged steel fittings that are inserted into the end of the pipe, and they come with different head types, including: hex, square, and round.

forged steel hex plug forged steel square plug forged steel round plug



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

forged steel cross threaded and socket weld

End Connection

Forged Steel fittings are available in threaded and socket weld end connections.

The dimensions for Socket Weld forged steel fitting conform to ASME B16.11 and threaded forged steel fittings conform to ASME (American Society of Mechanical Engineers) B1.20.1.

forged steel end connections threaded and socket weld

Pressure Class

Pressure - Temperature Service Ratings for Carbon Steel Forged Steel Socket Welding and Threaded Forged Steel Fittings

Service Nominal Pressure Rating
Temperature (°F) 2000 LB. 3000 LB. 6000 LB.
100° 2000 3000 6000
150° 1970 2950 5915
200° 1940 2915 5830
250° 1915 2875 5750
300° 1895 2845 5690
350° 1875 2810 5625
400° 1850 2775 5550
450° 1810 2715 5430
500° 1735 2605 5210
550° 1640 2460 4925
600° 1540 2310 4620
650° 1430 2150 4300
700° 1305 1960 3920
750° 1180 1775 3550
800° 1015 1525 3050
850° 830* 1250* 2500*
875° 725* 1090* 2180*
900° 615* 925* 1855**
925° 520* 785* 1570**
950° 425** 640** 1295**
975° 330* 500** 1000**
1000° 235** 350** 715**



Approved Forged Steel Fittings Manufacturers


Bonney Forge


Capitol Camco


Phoenix Forge