During the inspection of the stub end dimensions, you have to check for the following things;

  • Stub diameter – Both Lap and hub
  • Length
  • Thickness
  • Radius of the lap to stub hub

Refer to the table given below for the Stub end dimensions as per ASME B16.9

Stub End Dimensions

stub end dimensions
NOMINAL PIPE SIZELAP DIAMETEROUTSIDE DIAMETERLONG PATTERN LENGTHSHORT PATTERN LENGTHRADIUS
Inch.AOD MinOD MaxLLR
1/23522.820.576513
3/44328.125.976513
1513532.6102513
1 1/46443.641.4102515
1 1/27349.947.5102516
29262.459.5152648
2 1/210575.372.2152648
312791.388.11526410
3 1/2140104100.81527610
4157116.7113.51527611
5186144.3140.52037611
6216171.3167.52038913
8270222.1218.320310213
10324277.2272.325412713
12381328323.125415213
14413359.9354.830515213
16470411405.630515213
1853346245630515213
2058451450730515213
2264156555830515213
2469261660930515213

All dimensions are in mm

Pipe Fittings Dimensions Tolerance as per ASME B16.9

Dimension Tolerance
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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