Standard Pipe Fittings

The tree diagram of standard pipe fittings, categorized by end connections, types, and purposes, is displayed below.

Dimensional Standards for Pipe Fittings

• ASME B 16.1 -Cast Iron Pipe Flanges and Flanged Fittings
• ASME B 16.3 -Malleable-Iron Threaded Fittings
• ASME B 16.4 -Grey Iron Threaded fittings
• ASME B 16.5 -Pipe Flanges and Flanged Fittings
• ASME B 16.9 -Factory-Made Wrought Steel Butt welding Fittings
• ASME B 16.11 -Forged Fittings, Socket welding and Threaded
• ASME B 16.28 -Wrought Steel Butt welding Short Radius Elbows and Returns
• ASME B 16.42 -Ductile Iron Pipe Flanges and Flanged Fittings
• BS 1640 -Butt weld Fittings
• BS 3799 -Socket weld and Screwed end fittings
• BS 2598 -Glass Pipelines and Fittings
• MSS-SP-43 -Stainless Steel Fittings

 Socket Weld /Screwed Fitting Materials

• ASTM A105 -Forged Carbon Steel
• ASTM A181 -Forged Carbon Steel for General Purposes
• ASTM A182 -Forged Alloy Steel and Stainless Steel
• ASTM A234 -Wrought Carbon Steel and Alloy Steel pipe fittings for moderate and elevated temperatures
• ASTM A350 -Forged Alloy Steel for Low Temperature Services
• Bevelled end fittings are covered under ASME B 16.9, B16-28 and BS 1640. Thickness to suit pipe thickness.

 Butt Weld Fitting Materials

• ASTMA234-Carbon Steel and Alloy steel pipe fittings
• ASTMA403-Austenitic Stainless Steel fittings
• ASTMA420-Alloy Steel for low temperature Services
• Flanged fittings are covered under ASME B 16.5 and BS 1650 for carbon and alloy steel piping and ASME B 16.1 for cast iron fittings.

Flanged End Fitting Materials

• ASTM A 216 -Carbon Steel Castings
• ASTM A 351 -Stainless Steel Castings
• ASTM A 352 -Alloy Steel Castings
• ASTM F 1545 -Plastic Lined Fittings

Elbows

45 Deg. Elbow   

45 Deg. Miter Bend

90 Deg. Elbow (Long Radius R=1.5D)

90 Deg. Elbow (Short Radius R=1D)

90 Deg. Elbow (Socket Weld)

90 Deg. Miter Bend

180 Deg. Returns

 Tees

Equal Tees & Reducing Tees

Butt Weld Tees

Socket Weld Tees

 Cross

Equal & Reducing Cross

 Reducers

Concentric Reducer

Eccentric Reducer

 Stub Ends

Long Stub Ends & Short Stub Ends with class A & B

Class A

Class B

Couplings

Half Coupling

Full Coupling

Reducing Coupling 

Swage Nipple

Eccentric  & Concentric

Special Fittings

Weldolet

Sockolet

Threadolet

Elbowlet

Sweepolet

Nipolet

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