Content :

The lap joint flange is practically identical to a slip-on flange except it has a radius at the intersection of the bore and flange face. This radius is necessary to have the flange accommodate a lap joint stub end. Normally, a lap joint flange and a lap joint stub end are mated together is an assembly system.

Standards:
ASME (ANSI) B16.5 Class150, Class 300, Class 400, Class 600, Class 900, Class 1500, Class 2500.
DIN 2641, rated pressure 6.
DIN 2642, rated pressure 10