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Buttweld Fittings Sizes ASME B16.9

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Table of Contents

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 SizePipe Elbow Outside
Diameter Y
Wall Thickness T
(Pipe Elbow Schedule)
45 Deg. Elbow LR Centre to Face B45 Deg. Elbow LR
Weight
90 Deg. Elbow LR Centre to Face A90 Deg. Elbow LR Weight90 Deg. Elbow SR Centre to Face A90 Deg. Elbow SR Weight
mminmmmmSchedulemmkgmmkgmmkg
151/2”21.32.78STD15.90.0438.10.08
 3.73X.S15.90.0538.10.10
203/4”26.72.87STD11.10.0428.60.08
 3.91X.S11.10.0528.60.11
251”33.43.38STD22.20.0938.10.1525.40.11
 4.55X.S22.20.1138.10.1925.40.14
3211/4”42.23.56STD25.40.1447.60.2831.750.18
 4.85X.S25.40.247.60.3931.750.24
4011/2”48.33.68STD28.60.257.10.438.10.26
 5.08X.S28.60.2557.10.538.10.35
502”60.33.91STD34.90.3676.20.7250.80.5
 5.54X.S34.90.576.21.050.80.68
6521/2”73.05.16STD44.40.7395.21.4663.50.95
 7.01X.S44.40.9195.21.8263.51.27
803”88.95.49STD50.81.1114.32.1876.21.45
 7.62X.S50.81.45114.32.8676.21.95
1004”114.36.02STD63.52.1152.44.2101.62.8
 8.56X.S63.52.9152.45.7101.63.9
1255”141.36.65STD79.43.4190.06.8127.04.8
 9.5X.S79.45.0190.010.0127.06.5
1506”168.37.11STD95.25.1229.010.1152.46.8
 10.97X.S95.27.7229.015.3152.410.2
2008”219.18.18STD127.010.2305.020.4203.013.6
 12.7X.S127.015.5305.030.9203.020.9
25010”273.99.27STD159.018.1381.036.1254.024.1
 12.7X.S159.024.4381.048.8254.032.5
30012”323.99.52STD190.026.6457.053.1305.035.4
 12.7X.S190.035.0457.070.0305.046.7
35014”355.69.52STD222.034.1533.068.1356.045.4
 12.7X.S222.045.0533.090.0356.060.0
40016”406.49.52STD254.045.0610.089.3406.059.5
 12.7X.S254.059.0610.0118.0406.078.7
45018”457.09.52STD286.056.5686.0113.0457.075.6
 12.7X.S286.075.0686.0150.0457.0100.0
50020”508.09.52STD318.085.0762.0140.0508.093.5
 12.7X.S318.0112.5762.0186.0508.0124.0
60024”610.009.52STD381.0101.5914.0203.0610.0135.0
 12.7X.S381.0134.5914.0269.0610.0179.0

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
mminmmmmSchedulemmmmmmkg
151/2”21.32.78STD25.40.58
  3.73X.S25.40.21
203/4”26.72.87STD28.60.21
  3.91X.S28.60.27
251”33.43.38STD38.10.3438.10.1
  4.55X.S38.10.4338.10.14
3211/4”42.23.56STD47.60.6438.10.14
  4.85X.S47.60.7538.10.18
4011/2”48.33.68STD57.10.9538.10.18
  5.08X.S57.11.1338.10.23
502”60.33.91STD63.51.4538.10.27
  5.54X.S63.51.7238.10.32
6521/2”73.05.16STD76.22.4538.10.41
  7.01X.S76.22.9538.10.45
803”88.95.49STD85.73.4550.80.64
  7.62X.S85.74.350.80.82
1004”114.36.02STD105.05.763.51.13
  8.56X.S105.07.363.51.54
1255”141.36.65STD124.09.176.21.91
 9.5X.S124.011.876.22.59
1506”168.37.11STD143.013.688.92.95
  10.97X.S143.019.088.94.1
2008”219.18.18STD178.025.0101.65.0
  12.7X.S178.033.5101.67.3
25010”273.09.27STD216.041.0127.09.1
  12.7X.S216.054.0127.012.0
30012”323.99.52STD254.057.0152.413.6
 12.7X.S254.077.0152.417.0
35014”355.69.52STD279.073.0165.115.9
  12.7X.S279.093.0165.121.0
40016”406.49.52STD305.091.0178.820.0
  12.7X.S305.0120.0178.826.0
45018”457.09.52STD343.0127.0203.226.0
  12.7X.S343.0165.0203.234.0
50020”508.09.52STD381.0227.0228.633.0
  12.7X.S381.0270.0228.643.0
60024”610.09.52STD432.0345.0266.746.0
12.7X.S432.0430.0266.761.0

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
20×153/4” x 1/2”38.1STD0.07
XS0.1
25×151” x 1/2”50.8STD0.14
  X.S0.18
25×201” x 3/4”50.8STD0.14
  X.S0.18
32×1511/4” x 1/2”50.8STD0.18
  X.S0.23
32×2011/4” x 3/4“50.8STD0.18
  X.S0.23
32×2511/4” x 1”50.8STD0.18
  X.S0.23
40×1511/2” x 1/2”63.5STD0.27
  X.S0.32
40×2011/2” x 3/4”63.5STD0.27
X.S0.32
40×2511/2” x 1”63.5STD0.27
  X.S0.32
40×3211/2” x 11/4”63.5STD0.27
  X.S0.32
50×152” x 1/2”76.2STD0.41
  X.S0.54
50×202” x 3/4”76.2STD0.41
  X.S0.54
50×252”x1”76.2STD0.41
  X.S0.54
50×322” x 11/4”76.2STD0.41
  X.S0.54
50×402” x 11/2”76.2STD0.41
  X.S0.54
65×2521/2” x 1”88.9STD0.68
  X.S0.91
65×3221/2” x 11/4”88.9STD0.68
X.S0.91

Pipe reducer dimension and weight

Buttweld Reducer
Nominal Size
Pipe Reducer Length HPipe Reducer Schedule TPipe Reducer
Weight
mm in mm Kg
65×4021/2” x 11/2”88.9STD0.68
  X.S0.91
65×5021/2” x 2”88.9STD0.68
  X.S0.91
80×403” x 11/2”88.9STD0.77
  X.S1.09
80×503”x2”88.9STD0.91
  X.S1.22
80×653” x 21/2”88.9STD0.91
  X.S1.27
100×404” x 11/2”101.6STD1.36
  X.S1.91
100×504”x2”101.6STD1.40
  X.S1.95
100×654” x 21/2”101.6STD1.45
  X.S2.04
100×804”x3”101.6STD1.59
  X.S2.08
125×805”x3”127.0STD2.5
  X.S3.4
125 x 1005”x4”127.0STD2.7
  X.S3.8
150×506”x2”140.0STD3.4
  X.S4.3
150×656” x 21/2”140.0STD3.4
  X.S4.5
150×806”x3”140.0STD3.6
  X.S4.8
150 x 1006”x4”140.0STD3.7
  X.S5.2
150 x 1256”x5”140.0STD3.9
  X.S5.4

Pipe reducer dimension and weight

Buttweld Reducer
Nominal Size
Pipe Reducer Length HPipe Reducer Schedule TPipe Reducer
Weight
mm in mm Kg
200×808”x3”152.4STD4.5
  X.S7.2
200 x 1008”x4”152.4STD5.0
  X.S7.7
200 x 1258”x5”152.4STD5.4
  X.S8.2
200 x 1508”x6”152.4STD5.9
  X.S8.6
250 x 10010”x4”178.0STD9.1
  X.S11.8
250 x 12510”x5”178.0STD9.5
  X.S13.6
250 x 15010”x6”178.0STD9.5
  X.S13.6
250 x 20010”x8”178.0STD10.0
  X.S14.0
300 x 15012”x6”203.0STD14.1
  X.S18.1
300 x 20012”x8”203.0STD14.5
  X.S19.1
300 x 25012” x 10”203.0STD15.4
  X.S20.0
350 x 20014”x8”330.0STD26.3
  X.S34.9
350 x 25014” x 10”330.0STD27.2
  X.S36.3
350 x 30014” x 12”330.0STD28.6
  X.S37.6
400 x 20016”x8”356.0STD31.8
  X.S42.6
400 x 25016” x 10”356.0STD33.1
  X.S43.5
400 x 30016” x 12”356.0STD34.5
  X.S45.4

Pipe reducer dimension and weight

Buttweld Reducer
Nominal Size
Pipe Reducer Length HPipe Reducer Schedule TPipe Reducer
Weight
mm in mm Kg
400 x 35016” x 14”356.0STD35.4
  X.S46.3
450 x 25018” x 10”381.0STD38.0
  X.S52.1
450 x 30018” x 12”381.0STD39.0
  X.S53.5
450 x 35018” x 14”381.0STD40.0
  X.S54.9
450 x 40018” x 16”381.0STD40.8
  X.S53.5
500 x 25020” x 10”508.0STD53.0
  X.S79.9
500 x 30020” x 12”508.0STD54.4
  X.S82.0
500 x 35020” x 14”508.0STD57.6
  X.S80.2
500 x 40020” x 16”508.0STD58.9
  X.S82.0
500 x 45020” x 18”508.0STD61.7
X.S82.0
600 x 30024” x 12”508.0STD63.5
  X.S84.4
600 x 35024” x 14”508.0STD65.3
  X.S86.8
600 x 40024” x 16”508.0STD68.0
  X.S90.4
600 x 45024” x 18”508.0STD72.6
  X.S96.5
600 x 50024” x 20”508.0STD77.1
  X.S102.5

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 TCenter-to-End
Dimension
A ,C ,B
Over-all
Length H
Over-all
Length F
1/2 to 2-1/2+0.06Not 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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