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Weldable components

Fitting Tolerance

Butt-welding is the process of joining two pieces of material together along a single edge in a single plane.

This process can be used on many types of materials, though metal and thermoplastics are the most common. When two sheets of steel are laid side-by-side and joined together along a single joint, this is an example of butt-welding.

Tolerance For butt Welding Fittings
Alignment tolerances are concerned with the way that the ends of a fitting are cut. Exaggerated distortions are shown for clarity in the diagram below.
Tolerances are in millimeters. mm -ASME / ANSI B16.9
All Fittings 90, 45
Elbows and Tees
Reducers Caps 180?/span> Returns Angularity Tolerance
Nominal
Pipe Size
Outside
Diameter
at Bevel
Inside
Diameter
at End
Wall
Thickness
Center to End Dimension Overall
Length
Overall
Length
Center to
Center
Dimension
Back to
face
Dimension
Alignment
of Ends
Nominal
Pipe Size
off
Angle
off
Plane
(in) D   t A.B.C.M H E O K U (in) Q P
1/2to 21/2 +1.52-0.76 0.76 Not Less Than 87.5% of Nominal Thickness 1.52 1.52 3.05 6.35 6.35 0.76 1/2 to 4 0.76 1.51
3 to 31/2 1.52 1.52 1.52 1.52 3.05 6.35 6.35 0.75 5 to 8 1.52 3.05
4 1.52 1.52 1.52 1.52 3.05 6.35 6.36 0.76 10 to 12 2.29 4.83
5 to 8 +2.29-1.52 1.52 1.52 1.52 6.35 6.35 6.35 0.76 14 to 16 2.29 6.35
10 to 18 +4.06-3.05 3.05 2.29 2.29 6.35 9.65 6.35 1.52 18 to 24 3.05 9.65
20 to 24 +6.35-4.83 4.83 2.29 2.29 6.35 9.65 6.35 1.52 26 to 30 4.83 9.65
26 to 30 +6.35-4.83 4.83 3.05 4.83 9.65 - - - 32 to 36 4.83 12.7
32 to 36 +6.35-4.83 4.83 4.83 4.83 9.65 - - -      


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