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Buttweld Fittings Sizes ASME B16.9

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The ASME/ANSI B16.9 specification covers the dimensions and the tolerances of carbon and alloy butt weld fittings. The MSS-SP 43 specification integrates ASME B16.9 to cover stainless steel and nickel alloy pipe fittings. In this article, we show the dimensions and weights of buttweld elbows, tees, and reducers.

BUTTWELD FITTINGS DIMENSIONS ASME B16.9

45/90 Deg. BW Elbow

Dimensions and weights of buttweld 45/90 degree elbows short and long radius (NPS 1/2 to 24, schedule STD/XS) – ASME B16.9

Buttweld fittings dimensions: pipe elbow 45 and 90 degrees LR and SR
Pipe Elbow Nominal Size Pipe Elbow Outside
Diameter Y		 Wall Thickness T
(Pipe Elbow Schedule)		 45 Deg. Elbow LR Centre to Face B 45 Deg. Elbow LR
Weight		 90 Deg. Elbow LR Centre to Face A 90 Deg. Elbow LR Weight 90 Deg. Elbow SR Centre to Face A 90 Deg. Elbow SR Weight
mm in mm mm Schedule mm kg mm kg mm kg
15 1/2” 21.3 2.78 STD 15.9 0.04 38.1 0.08 – –
  3.73 X.S 15.9 0.05 38.1 0.10 – –
20 3/4” 26.7 2.87 STD 11.1 0.04 28.6 0.08 – –
  3.91 X.S 11.1 0.05 28.6 0.11 – –
25 1” 33.4 3.38 STD 22.2 0.09 38.1 0.15 25.4 0.11
  4.55 X.S 22.2 0.11 38.1 0.19 25.4 0.14
32 11/4” 42.2 3.56 STD 25.4 0.14 47.6 0.28 31.75 0.18
  4.85 X.S 25.4 0.2 47.6 0.39 31.75 0.24
40 11/2” 48.3 3.68 STD 28.6 0.2 57.1 0.4 38.1 0.26
  5.08 X.S 28.6 0.25 57.1 0.5 38.1 0.35
50 2” 60.3 3.91 STD 34.9 0.36 76.2 0.72 50.8 0.5
  5.54 X.S 34.9 0.5 76.2 1.0 50.8 0.68
65 21/2” 73.0 5.16 STD 44.4 0.73 95.2 1.46 63.5 0.95
  7.01 X.S 44.4 0.91 95.2 1.82 63.5 1.27
80 3” 88.9 5.49 STD 50.8 1.1 114.3 2.18 76.2 1.45
  7.62 X.S 50.8 1.45 114.3 2.86 76.2 1.95
100 4” 114.3 6.02 STD 63.5 2.1 152.4 4.2 101.6 2.8
  8.56 X.S 63.5 2.9 152.4 5.7 101.6 3.9
125 5” 141.3 6.65 STD 79.4 3.4 190.0 6.8 127.0 4.8
  9.5 X.S 79.4 5.0 190.0 10.0 127.0 6.5
150 6” 168.3 7.11 STD 95.2 5.1 229.0 10.1 152.4 6.8
  10.97 X.S 95.2 7.7 229.0 15.3 152.4 10.2
200 8” 219.1 8.18 STD 127.0 10.2 305.0 20.4 203.0 13.6
  12.7 X.S 127.0 15.5 305.0 30.9 203.0 20.9
250 10” 273.9 9.27 STD 159.0 18.1 381.0 36.1 254.0 24.1
  12.7 X.S 159.0 24.4 381.0 48.8 254.0 32.5
300 12” 323.9 9.52 STD 190.0 26.6 457.0 53.1 305.0 35.4
  12.7 X.S 190.0 35.0 457.0 70.0 305.0 46.7
350 14” 355.6 9.52 STD 222.0 34.1 533.0 68.1 356.0 45.4
  12.7 X.S 222.0 45.0 533.0 90.0 356.0 60.0
400 16” 406.4 9.52 STD 254.0 45.0 610.0 89.3 406.0 59.5
  12.7 X.S 254.0 59.0 610.0 118.0 406.0 78.7
450 18” 457.0 9.52 STD 286.0 56.5 686.0 113.0 457.0 75.6
  12.7 X.S 286.0 75.0 686.0 150.0 457.0 100.0
500 20” 508.0 9.52 STD 318.0 85.0 762.0 140.0 508.0 93.5
  12.7 X.S 318.0 112.5 762.0 186.0 508.0 124.0
600 24” 610.00 9.52 STD 381.0 101.5 914.0 203.0 610.0 135.0
  12.7 X.S 381.0 134.5 914.0 269.0 610.0 179.0

BW Tee and Caps

Dimensions and weights of buttweld tee and cap (NPS 1/2 to 24, schedule STD/XS) – ASME B16.9
Pipe cap and tee dimension and weight

Buttweld Tee and Cap
Nominal Size		 Pipe Tee and Cap Outside
Diameter Y		 Pipe Tee and Cap Wall
Thickness T		 Buttweld Tee
Dimensions
(C and M)		 Buttweld Tee
Weight		 Buttweld Cap
End to End		 Buttweld Cap
Weight
mm in mm mm Schedule mm mm mm kg
15 1/2” 21.3 2.78 STD 25.4 0.58
    3.73 X.S 25.4 0.21
20 3/4” 26.7 2.87 STD 28.6 0.21
    3.91 X.S 28.6 0.27
25 1” 33.4 3.38 STD 38.1 0.34 38.1 0.1
    4.55 X.S 38.1 0.43 38.1 0.14
32 11/4” 42.2 3.56 STD 47.6 0.64 38.1 0.14
    4.85 X.S 47.6 0.75 38.1 0.18
40 11/2” 48.3 3.68 STD 57.1 0.95 38.1 0.18
    5.08 X.S 57.1 1.13 38.1 0.23
50 2” 60.3 3.91 STD 63.5 1.45 38.1 0.27
    5.54 X.S 63.5 1.72 38.1 0.32
65 21/2” 73.0 5.16 STD 76.2 2.45 38.1 0.41
    7.01 X.S 76.2 2.95 38.1 0.45
80 3” 88.9 5.49 STD 85.7 3.45 50.8 0.64
    7.62 X.S 85.7 4.3 50.8 0.82
100 4” 114.3 6.02 STD 105.0 5.7 63.5 1.13
    8.56 X.S 105.0 7.3 63.5 1.54
125 5” 141.3 6.65 STD 124.0 9.1 76.2 1.91
  9.5 X.S 124.0 11.8 76.2 2.59
150 6” 168.3 7.11 STD 143.0 13.6 88.9 2.95
    10.97 X.S 143.0 19.0 88.9 4.1
200 8” 219.1 8.18 STD 178.0 25.0 101.6 5.0
    12.7 X.S 178.0 33.5 101.6 7.3
250 10” 273.0 9.27 STD 216.0 41.0 127.0 9.1
    12.7 X.S 216.0 54.0 127.0 12.0
300 12” 323.9 9.52 STD 254.0 57.0 152.4 13.6
  12.7 X.S 254.0 77.0 152.4 17.0
350 14” 355.6 9.52 STD 279.0 73.0 165.1 15.9
    12.7 X.S 279.0 93.0 165.1 21.0
400 16” 406.4 9.52 STD 305.0 91.0 178.8 20.0
    12.7 X.S 305.0 120.0 178.8 26.0
450 18” 457.0 9.52 STD 343.0 127.0 203.2 26.0
    12.7 X.S 343.0 165.0 203.2 34.0
500 20” 508.0 9.52 STD 381.0 227.0 228.6 33.0
    12.7 X.S 381.0 270.0 228.6 43.0
600 24” 610.0 9.52 STD 432.0 345.0 266.7 46.0
12.7 X.S 432.0 430.0 266.7 61.0

Concentric/Eccentric Pipe Reducers

Dimensions and weights of buttweld reducers concentric and eccentric (NPS 1/2 to 24, schedule STD/XS) – ASME B16.9
Pipe reducer dimension and weight

Buttweld Reducer
Nominal Size		 Pipe Reducer Length H Pipe Reducer Schedule T Pipe Reducer
Weight
mm in mm Kg
20×15 3/4” x 1/2” 38.1 STD 0.07
XS 0.1
25×15 1” x 1/2” 50.8 STD 0.14
    X.S 0.18
25×20 1” x 3/4” 50.8 STD 0.14
    X.S 0.18
32×15 11/4” x 1/2” 50.8 STD 0.18
    X.S 0.23
32×20 11/4” x 3/4“ 50.8 STD 0.18
    X.S 0.23
32×25 11/4” x 1” 50.8 STD 0.18
    X.S 0.23
40×15 11/2” x 1/2” 63.5 STD 0.27
    X.S 0.32
40×20 11/2” x 3/4” 63.5 STD 0.27
X.S 0.32
40×25 11/2” x 1” 63.5 STD 0.27
    X.S 0.32
40×32 11/2” x 11/4” 63.5 STD 0.27
    X.S 0.32
50×15 2” x 1/2” 76.2 STD 0.41
    X.S 0.54
50×20 2” x 3/4” 76.2 STD 0.41
    X.S 0.54
50×25 2”x1” 76.2 STD 0.41
    X.S 0.54
50×32 2” x 11/4” 76.2 STD 0.41
    X.S 0.54
50×40 2” x 11/2” 76.2 STD 0.41
    X.S 0.54
65×25 21/2” x 1” 88.9 STD 0.68
    X.S 0.91
65×32 21/2” x 11/4” 88.9 STD 0.68
X.S 0.91

Pipe reducer dimension and weight

Buttweld Reducer
Nominal Size		 Pipe Reducer Length H Pipe Reducer Schedule T Pipe Reducer
Weight
mm in mm Kg
65×40 21/2” x 11/2” 88.9 STD 0.68
    X.S 0.91
65×50 21/2” x 2” 88.9 STD 0.68
    X.S 0.91
80×40 3” x 11/2” 88.9 STD 0.77
    X.S 1.09
80×50 3”x2” 88.9 STD 0.91
    X.S 1.22
80×65 3” x 21/2” 88.9 STD 0.91
    X.S 1.27
100×40 4” x 11/2” 101.6 STD 1.36
    X.S 1.91
100×50 4”x2” 101.6 STD 1.40
    X.S 1.95
100×65 4” x 21/2” 101.6 STD 1.45
    X.S 2.04
100×80 4”x3” 101.6 STD 1.59
    X.S 2.08
125×80 5”x3” 127.0 STD 2.5
    X.S 3.4
125 x 100 5”x4” 127.0 STD 2.7
    X.S 3.8
150×50 6”x2” 140.0 STD 3.4
    X.S 4.3
150×65 6” x 21/2” 140.0 STD 3.4
    X.S 4.5
150×80 6”x3” 140.0 STD 3.6
    X.S 4.8
150 x 100 6”x4” 140.0 STD 3.7
    X.S 5.2
150 x 125 6”x5” 140.0 STD 3.9
    X.S 5.4

Pipe reducer dimension and weight

Buttweld Reducer
Nominal Size		 Pipe Reducer Length H Pipe Reducer Schedule T Pipe Reducer
Weight
mm in mm Kg
200×80 8”x3” 152.4 STD 4.5
    X.S 7.2
200 x 100 8”x4” 152.4 STD 5.0
    X.S 7.7
200 x 125 8”x5” 152.4 STD 5.4
    X.S 8.2
200 x 150 8”x6” 152.4 STD 5.9
    X.S 8.6
250 x 100 10”x4” 178.0 STD 9.1
    X.S 11.8
250 x 125 10”x5” 178.0 STD 9.5
    X.S 13.6
250 x 150 10”x6” 178.0 STD 9.5
    X.S 13.6
250 x 200 10”x8” 178.0 STD 10.0
    X.S 14.0
300 x 150 12”x6” 203.0 STD 14.1
    X.S 18.1
300 x 200 12”x8” 203.0 STD 14.5
    X.S 19.1
300 x 250 12” x 10” 203.0 STD 15.4
    X.S 20.0
350 x 200 14”x8” 330.0 STD 26.3
    X.S 34.9
350 x 250 14” x 10” 330.0 STD 27.2
    X.S 36.3
350 x 300 14” x 12” 330.0 STD 28.6
    X.S 37.6
400 x 200 16”x8” 356.0 STD 31.8
    X.S 42.6
400 x 250 16” x 10” 356.0 STD 33.1
    X.S 43.5
400 x 300 16” x 12” 356.0 STD 34.5
    X.S 45.4

Pipe reducer dimension and weight

Buttweld Reducer
Nominal Size		 Pipe Reducer Length H Pipe Reducer Schedule T Pipe Reducer
Weight
mm in mm Kg
400 x 350 16” x 14” 356.0 STD 35.4
    X.S 46.3
450 x 250 18” x 10” 381.0 STD 38.0
    X.S 52.1
450 x 300 18” x 12” 381.0 STD 39.0
    X.S 53.5
450 x 350 18” x 14” 381.0 STD 40.0
    X.S 54.9
450 x 400 18” x 16” 381.0 STD 40.8
    X.S 53.5
500 x 250 20” x 10” 508.0 STD 53.0
    X.S 79.9
500 x 300 20” x 12” 508.0 STD 54.4
    X.S 82.0
500 x 350 20” x 14” 508.0 STD 57.6
    X.S 80.2
500 x 400 20” x 16” 508.0 STD 58.9
    X.S 82.0
500 x 450 20” x 18” 508.0 STD 61.7
X.S 82.0
600 x 300 24” x 12” 508.0 STD 63.5
    X.S 84.4
600 x 350 24” x 14” 508.0 STD 65.3
    X.S 86.8
600 x 400 24” x 16” 508.0 STD 68.0
    X.S 90.4
600 x 450 24” x 18” 508.0 STD 72.6
    X.S 96.5
600 x 500 24” x 20” 508.0 STD 77.1
    X.S 102.5

BUTTWELD FITTINGS TOLERANCE

Buttweld Fittings ASME B16.9 Tolerance (Elbow, Cap, Tee, Reducer) 90 Deg. & 45 Deg.
Elbow and Tee		 Pipe Reducer
& Lap Joint
Stub End		 Pipe Cap
Buttweld Fitting Dimension (NPS) Outside
Diameter
at Bevel		 Inside
Diameter
at End		 WallThickness T Center-to-End
Dimension
A ,C ,B		 Over-all
Length H		 Over-all
Length F
1/2 to 2-1/2 +0.06 Not less than 87.5%
of nominal thickness		 +/- 0.06 +/- 0.06 +/- 0.12
-0.03
3 to 3-1/2 +/- 0.06 +/- 0.06 +/- 0.06 +/- 0.06 +/- 0.12
4 +/- 0.06 +/- 0.06 +/- 0.06 +/- 0.06 +/- 0.12
5 to 8 +/- 0.06 +/- 0.06 +/- 0.06 +/- 0.06 +/- 0.25
10 to 18 +0.16 +/- 0.12 +/- 0.09 +/- 0.09 +/- 0.25
-0.12
20 to 24 +0.25 +/- 0.19 +/- 0.09 +/- 0.09 +/- 0.25
-0.19
26 to 30 +0.25 +/- 0.19 +/- 0.12 +/- 0.19 +/- 0.38
-0.19
32 to 48 +0.25 +/- 0.19 +/- 0.19 +/- 0.19 +/- 0.38
-0.19

 

Tolerances of butt weld fittings (in inches) according to ASME/ANSI B16.9. for all carbon alloy fittings except short radius elbows and returns (ASME/ANSI B16.28).

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