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 SIZE OUTSIDE DIAMETER CENTER TO END
Inch. OD A B C
1/2 21.3 38 16
3/4 26.7 29 11
1 33.4 38 22 25
1 1/4 42.2 48 25 32
1 1/2 48.3 57 29 38
2 60.3 76 35 51
2 1/2 73 95 44 64
3 88.9 114 51 76
3 1/2 101.6 133 57 89
4 114.3 152 64 102
5 141.3 190 79 127
6 168.3 229 95 152
8 219.1 305 127 203
10 273.1 381 159 254
12 323.9 457 190 305
14 355.6 533 222 356
16 406.4 610 254 406
18 457.2 686 286 457
20 508 762 318 508
22 559 838 343 559
24 610 914 381 610
26 660 991 406 660
28 711 1067 438 711
30 762 1143 470 762
32 813 1219 502 813
34 864 1295 533 864
36 914 1372 565 914
38 965 1448 600 965
40 1016 1524 632 1016
42 1067 1600 660 1067
44 1118 1676 695 1118
46 1168 1753 727 1168
48 1219 1829 759 1219
All Dimensions are in mm
Piping Courses

Pipe Fittings Dimensions Tolerance as per ASME B16.9

Dimension Tolerance Elbow
NOMINAL PIPE SIZE ALL FITTINGS ALL FITTINGS ALL FITTINGS ELBOWS AND TEES 180 DEG RETURN BENDS 180 DEG RETURN BENDS 180 DEG RETURN BENDS REDUCERS CAPS
NPS O.D. at Bevel (1), (2) I.D. at End
(1), (3), (4)
Wall Thickness (3) Centre-to-End Dimension A,B,C,M Centre-to-Centre O Back-to-Face K Alignment of Ends U Overall Length H Overall Length E
½ to 2½ 0.06
-0.03
0.03 Not less than 87.5% of nominal thickness 0.06 0.25 0.25 0.03 0.06 0.12
3 to 3 ½ 0.06 0.06 0.06 0.25 0.25 0.03 0.06 0.12
4 0.06 0.06 0.06 0.25 0.25 0.03 0.06 0.12
5 to 8 0.09
-0.06
0.06 0.06 0.25 0.25 0.03 0.06 0.25
10 to 18 0.16
-0.12
0.12 0.09 0.38 0.25 0.06 0.09 0.25
20 to 24 0.25
-0.19
0.19 0.09 0.38 0.25 0.06 0.09 0.25
26 to 30 0.25
-0.19
0.19 0.12 0.19 0.38
32 to 48 0.25
-0.19
0.19 0.19 0.19 0.38
NOMINAL PIPE SIZE NPS ANGULARITY TOLERANCES ANGULARITY TOLERANCES ALL DIMENSIONS ARE GIVEN IN INCHES. TOLERANCES ARE EQUAL PLUS AND MINUS EXCEPT AS NOTED.
Off Angle Q Off 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 4 0.03 0.06
5 to 8 0.06 0.12
10 to 12 0.09 0.19
14 to 16 0.09 0.25
18 to 24 0.12 0.38
26 to 30 0.19 0.38
32 to 42 0.19 0.50
44 to 48 0.18 0.75

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