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Buttweld Pipe Fittings – Dimensions ANSI/ASME B36.19

Dimensions of butt-welding fittings can be taken from the tables below

Dimensional Tolerances Long Radius Elbows ASME B16.9

Nominal Pipe Size
(inches)
Outside Pipe Diameter
(inches)
Distance Center to End 
(inches)
90o Elbows 45o Elbows
1 1.315 1 1/2 7/8
1 1/4 1.660 1 7/8 1
1 1/2 1.900 2 1/4 1 1/8
2 2.375 3 1 3/8
2 1/2 2.875 3 3/4 1 3/4
3 3.5 4 1/2 2
3 1/2 4.0 5 1/4 2 1/4
4 4.5 6 2 1/2
5 5.563 7 1/2 3 1/8
6 6.625 9 3 3/4
8 8.625 12 5
10 10.750 15 6 1/4

Dimensional Tolerances 180o Returns ASME B16.9

Nominal Pipe Size
(inches)
Outside Pipe Diameter
(inches)
Distance
(inches)
Center to Center Back to Face
1 1.315 3 2 3/16
1 1/4 1.660 3 3/4 2 3/4
1 1/2 1.900 4 1/2 3 1/4
2 2.375 6 4 3/16
2 1/2 2.875 7 1/2 5 3/16
3 3.5 9 6 1/4
3 1/2 4.0 10 1/2 7 1/4
4 4.5 12 8 1/4
5 5.563 15 10 5/16
6 6.625 18 12 5/16
8 8.625 24 16 5/16
10 10.750 30 20 3/8

Dimensional Tolerances of Straight Tees ASME B16.9

Nominal Pipe Size
(inches)
Outside Pipe Diameter
(inches)
Distance Center to End
(inches)
Run Outlet
1 1.315 1 1/2 1 1/2
1 1/4 1.660 1 7/8 1 7/8
1 1/2 1.900 2 1/4 2 1/4
2 2.375 2 1/2 2 1/2
2 1/2 2.875 3 3
3 3.5 3 3/8 3 3/8
3 1/2 4.0 3 3/4 3 3/4
4 4.5 4 1/8 4 1/8
5 5.563 4 7/8 4 7/8
6 6.625 5 5/8 5 5/8
8 8.625 7 7
10 10.750 8 1/2 8 1/2

Dimensional Tolerances of Concentric and Eccentric Reducers ASME B16.9

Nominal Pipe Size 1/2 to 2½ 3 to 3½ 4 5 to 8 10 to 18 20 to 24 26 to 30 32 to 48
Outside Diameter
at Bevel (D)
+ 1.6
– 0.8
1.6 1.6 + 2.4
– 1.6
+ 4
– 3.2
+ 6.4
– 4.8
+ 6.4
– 4.8
+ 6.4
– 4.8
Inside Diameter at End 0.8 1.6 1.6 1.6 3.2 4.8 + 6.4
– 4.8
+ 6.4
– 4.8
Overall Length (H) 2 2 2 2 2 2 5 5
Wall Thickness (t) Not less than 87.5% of Nominal Wall Thickness

Dimensional Tolerances of Stainless Steel Elbows and Returns ASME B16.9

Nominal
Pipe
Size
(inches)
Outside
Diameter
90o Elbows 45o Elbows 180o Returns
Long Radius Short Radius Long Radius Long Radius
(mm) (inches) Center to Face
(inches)
Center to Face
(inches)
Center to Face
(inches)
Radius
(inches)
Center to Center
(inches)
Back to face
(inches)
1/2 21.3 0.840 1 1/2 - 5/8   2 1 7/8
3/4 26.7 1.050 1 1/8 - 7/16   2 1/4 1 11/16
1 33.4 1.315 1 1/2 1 7/8   3 2 3/16
1 1/4 42.2 1.660 1 7/8 1 1/4 1   3 3/4 2 3/4
1 1/2 48.3 1.900 2 1/4 1 1/2 1 1/8 3 4 1/2 3 1/4
2 60.3 2.375 3 2 1 3/8 4 6 4 3/16
2 1/2 73.0 2.875 3 3/4 2 1/2 1 3/4 5 7 1/2 5 3/16
3 88.9 3.500 4 1/2 3 2 6 9 6 1/4
3 1/2 101.6 4.000 5 1/4 3 1/2 2 1/4 7 10 1/2 7 1/4
4 114.3 4.500 6 4 2 1/2 8 12 8 1/4
5 141.3 5.563 7 1/2 5 3 1/8 10 15 10 5/16
6 168.3 6.625 9 6 3 3/4 12 18 12 5/16
8 219.1 8.625 12 8 5 12 24 16 5/16
10 273.1 10.750 15 10 6 1/4 15 30 20 3/8
12 323.9 12.750 18 12 7 1/2 18 36 24 3/8

Dimensional Tolerances of Stainless Steel Tees, Caps, Stub Ends and Straight Crosses ASME B16.9

Nominal
Pipe
Size
(inches)
Outside
Diameter
Caps Straight Tees Straight Crosses Stub Ends
(mm) (inches) Length
(inches)
Center to End
(inches)
Center to End
(inches)
Lap Diameter
(inches)
Long Length
(inches)
Short Length
(inches)
1/2 21.3 0.840 1 1 - 1 3/8 3 2
3/4 26.7 1.050 1 1 1/8 - 1 11/16 3 2
1 33.4 1.315 1 1/2 1 1/2 1 1/2 2 4 2
1 1/4 42.2 1.660 1 1/2 1 7/8 1 7/8 2 1/2 4 2
1 1/2 48.3 1.900 1 1/2 2 1/4 2 1/4 2 7/8 4 2
2 60.3 2.375 1 1/2 2 1/2 2 1/2 3 5/8 6 2 1/2
2 1/2 73.0 2.875 1 1/2 3 3 4 1/8 6 2 1/2
3 88.9 3.500 2 3 3/8 3 3/8 5 6 2 1/2
3 1/2 101.6 4.000 2 1/2 3 3/4 3 3/4 5 1/2 6 3
4 114.3 4.500 2 1/2 4 1/8 4 1/8 6 3/16 6 3
5 141.3 5.563 3 4 7/8 4 7/8 7 5/16 8 3
6 168.3 6.625 3 1/2 5 5/8 5 5/8 8 1/2 8 3 1/2
8 219.1 8.625 4 7 7 10 5/8 8 4
10 273.1 10.750 5 8 1/2 8 1/2 12 3/4 10 5
12 323.9 12.750 6 10 10 15 10 6

Dimensional Tolerances of Stainless Steel Reducers ASME B16.9

Nominal Pipe Size Outside Diameter Reducers
Reduced from
(inches)
(mm) (inches) Reduced to
(inches)
Concentric & Eccentric Length
(inches)
1/2 21.3 0.840 1/4 1 1/2
3/8 1 1/2
3/4 26.7 1.050 3/8 2
1/2 2
1 33.4 1.315 3/8 2
1/2 2
3/4 2
1 1/4 42.2 1.660 1/2 2
3/4 2
1 2
1 1/2 48.3 1.900 1/2 2 1/2
3/4 2 1/2
1 2 1/2
1 1/4 2 1/2
2 60.3 2.375 3/4 3
1 3
1 1/4 3
1 1/2 3
2 1/2 73.0 2.875 1 3 1/2
1 1/4 3 1/2
1 1/2 3 1/2
2 3 1/2
3 88.9 3.500 1 3 1/2
1 1/2 3 1/2
2 3 1/2
2 1/2 3 1/2
3 1/2 101.6 4.000 1 1/4 4
1 1/2 4
2 4
2 1/2 4
3 4
4 114.3 4.500 1 1/2 4
2 4
2 1/2 4
3 4
3 1/2 4
5 141.3 5.563 2 5
2 1/2 5
3 5
3 1/2 5
4 5
6 168.3 6.625 2 1/2 5 1/2
3 5 1/2
3 1/2 5 1/2
4 5 1/2
5 5 1/2
8 219.1 8.625 3 6
3 1/2 6
4 6
5 6
6 6
10 273.1 10.750 4 7
5 7
6 7
8 7
12 323.9 12.750 5 8
6 8
8 8
10 8

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