Pipe Elbow dimensions are covered in ASME B16.9. Refer to the table given below for the size 1/2″ to 48″.

long radius elbow dimensions
NOMINAL PIPE SIZEOUTSIDE DIAMETERCENTER TO END
Inch.ODABC
1/221.33816
3/426.72911
133.4382225
1 1/442.2482532
1 1/248.3572938
260.3763551
2 1/273954464
388.91145176
3 1/2101.61335789
4114.315264102
5141.319079127
6168.322995152
8219.1305127203
10273.1381159254
12323.9457190305
14355.6533222356
16406.4610254406
18457.2686286457
20508762318508
22559838343559
24610914381610
26660991406660
287111067438711
307621143470762
328131219502813
348641295533864
369141372565914
389651448600965
40101615246321016
42106716006601067
44111816766951118
46116817537271168
48121918297591219
All Dimensions are in mm
Piping Courses

Pipe Fittings Dimensions Tolerance as per ASME B16.9

Dimension Tolerance Elbow
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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