Concentric Pipe Reducer and Eccentric Pipe Reducer Dimensions are covered in ASME B16.9. Refer to the table given below for the size 1/2″ to 24″.

concentric reducer and eccentric reducer dimensions
NOMINAL PIPE SIZEOUTSIDE DIAMETEREND TO END
InchDPH
3/4 x 1/226.721.338
3/4 x 3/826.717.138
1 x 3/433.426.751
1 x 1/233.421.351
1 1/4 x 142.233.451
1 1/4 x 3/442.226.751
1 1/4 x 1/242.221.351
1 1/2 x 1 1/248.342.264
1 1/2 x 148.333.464
1 1/2 x 3/448.326.764
1 1/2 x 1/248.321.364
2 x 1 1/260.348.276
2 x 1 1/460.342.276
2 x 160.333.476
2 x 3/460.326.776
2 1/2 x 27360.389
2 1/2 x 1 1/27348.389
2 1/2 x 1 1/47342.289
2 1/2 x 17333.489
3 x 2 1/288.97389
3 x 288.960.389
3 x 1 1/288.948.389
3 x 1 1/488.942.289
3 1/2 x 3101.688.9102
3 1/2 x 21/2101.673102
3 1/2 x 2101.660.3102
3 1/2 x 1 1/2101.648.3102
3 1/2 x 1 1/4101.642.2102
4 x 3 1/2114.3101.6102
4 x 3114.388.9102
4 x 2 1/2114.373102
4 x 2114.360.3102
4 x 1 1/2114.348.3102
5 x 4141.3114.3127
5 x 3 1/2141.3101.6127
5 x 3141.388.9127
5 x 2 1/2141.373127
5 x 2141.360.3127
6 x 5168.3141.3140
6 x 4168.3114.3140
6 x 3 1/2168.3101.6140
6 x 3168.388.9140
6 x 2 1/2168.373140
8 x 6219.1168.3152
8 x 5219.1141.3152
8 x 4219.1114.3152
8 x 3 1/2219.1101.6152
10 x 8273.1219.1178
10 x 6273.1168.1178
10 x 5273.1141.3178
10 x 4273.1114.3178
12 x 10323.9273.1203
12 x 8323.9219.1203
12 x 6323.9168.3203
12 x 5323.9141.3203
14 x 12355.6323.9330
14 x 10355.6273.1330
14 x 8355.6219.1330
14 x 6355.6168.3330
16 x 14406.4355.6356
16 x 12406.4323.9356
16 x 10406.4273.1356
16 x 8406.4219.1356
16 x 6406.4168.3356
18 x 16457406.4381
18 x 14457355.6381
18 x 12457323.9381
18 x 10457273.1381
18 x 8457219.1381
20 x 18508457508
20 x 16508406.4508
20 x 14508355.6508
20 x 12508323.9508
20 x 10508273.1508
20 x 8508219.1508
22 x 20559508508
22 x 18559457508
22 x 16559406.4508
22 x 14559355.6508
22 x 12559323.9508
24 x 10559273.1508
24 x 22610559508
24 x 20610508508
24 x 18610457508
24 x 16610406.4508
24 x 14610355.6508
24 x 12610323.9508
24 x 10610273.1508
All Dimensions are in mm

Pipe Fittings Dimensions Tolerance as per ASME B16.9

Dimension Tolerance for Concentric and Eccentric Reducer
Piping Courses
NOMINAL PIPE SIZEALL FITTINGSALL FITTINGSALL FITTINGSELBOWS AND TEES180 DEG RETURN BENDS180 DEG RETURN BENDS180 DEG RETURN BENDSREDUCERSCAPS
NPSO.D. at Bevel (1), (2)I.D. at End
(1), (3), (4)
Wall Thickness (3)Centre-to-End Dimension A,B,C,MCentre-to-Centre OBack-to-Face KAlignment of Ends UOverall Length HOverall Length E
½ to 2½0.06
-0.03
0.03Not less than 87.5% of nominal thickness0.060.250.250.030.060.12
3 to 3 ½0.060.060.060.250.250.030.060.12
40.060.060.060.250.250.030.060.12
5 to 80.09
-0.06
0.060.060.250.250.030.060.25
10 to 180.16
-0.12
0.120.090.380.250.060.090.25
20 to 240.25
-0.19
0.190.090.380.250.060.090.25
26 to 300.25
-0.19
0.190.120.190.38
32 to 480.25
-0.19
0.190.190.190.38
NOMINAL PIPE SIZE NPSANGULARITY TOLERANCESANGULARITY TOLERANCESALL DIMENSIONS ARE GIVEN IN INCHES. TOLERANCES ARE EQUAL PLUS AND MINUS EXCEPT AS NOTED.
Off Angle QOff Plane P(1) Out-of-round is the sum of absolute values of plus and minus tolerance.
(2) This tolerance may not apply in localized areas of formed fittings where increased wall thickness is required to meet design requirements of ASME B16.9.
(3) The inside diameter and the nominal wall thicknesses at ends are to be specified by the purchaser.
(4) Unless otherwise specified by the purchaser, these tolerances apply to the nominal inside diameter, which equals the difference between the nominal outside diameter and twice the nominal wall thickness.
½ to 40.030.06
5 to 80.060.12
10 to 120.090.19
14 to 160.090.25
18 to 240.120.38
26 to 300.190.38
32 to 420.190.50
44 to 480.180.75

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