Lap Joint Stub End Metric Dimensions as per ASME B16.9

Advertisement

Lap Joint Stub End

View dimensions in inch

NPS ODMax ODMin LPF SPF R G
1/2 22.8 20.5 76 51 3 35
3/4 28.1 25.9 76 51 3 43
1 35.0 32.6 102 51 3 51
1-1/4 43.6 41.4 102 51 5 64
11/2 49.9 47.5 102 51 6 73
2 62.4 59.5 152 64 8 92
2-1/2 75.3 72.2 152 64 8 105
3 91.3 88.1 152 64 10 127
3-1/2 104.0 100.8 152 76 10 140
4 116.7 113.5 152 76 11 157
5 144.3 140.5 203 76 11 186
6 171.3 167.5 203 89 13 216
8 222.1 218.3 203 102 13 270
10 277.2 272.3 254 127 13 324
12 328.0 323.1 254 152 13 381
NPS ODMax ODMin LPF SPF R G
14 359.9 354.8 305 152 13 413
16 411.0 405.6 305 152 13 470
18 462.0 456.0 305 152 13 533
20 514.0 507.0 305 152 13 584
22 565.0 558.0 305 152 13 641
24 616.0 609.0 305 152 13 692

GENERAL NOTES:

(a) All dimensions are in millimeters.
(b) See Table 13 for tolerances.
(c) Service conditions and joint construction often dictate stub end length requirements. Therefore, the purchaser must specify long or
short pattern fitting when ordering.

NOTES:

(1) Gasket face finish shall be in accordance with ASME B16.5 for raised face flanges.
(2) The lap thickness T shall not be less than nominal pipe wall thickness. See Table 13 for maximum tolerance.
(3) When short pattern stub ends are used with larger flanges in Classes 300 and 600, with most sizes in Classes 900 and higher, and
when long pattern stub ends are used with larger flanges in Classes 1500 and 2500, it may be necessary to increase the length of the
stub ends in order to avoid covering the weld with the flange. Such increases in length shall be a matter of agreement between the
manufacturer and purchaser.
(4) When special facings such as tongue and groove, male and female, etc., are employed, additional lap thickness must be provided and
such additional thickness shall be in addition to (not included in) the basic length F.
(5) These dimensions conform to the radius established for lap joint flanges in ASME B16.5.
(6) This dimension conforms to standard machined facings shown in ASME B16.5. The back face of the lap shall be machined to conform
to the surface on which it seats. Where ring joint facings are to be applied, use dimension K as given in ASME B16.5.

%d bloggers like this: