Intro: 

Lap joints flanges do not come with any facing, and are therefore considered flat faced.

These Lap joints flanges are available in all of our stainless steel and chrome-moly grades,from ½” to 24” and beyond, class 150 to 2500. We also stock popular sizes of large diameter LDS Lap Joint flanges in A105N, and can supply all sizes of LDS Lap Joints with longer lead times. We can also source many of your other specification requirements.

The lap joint flange is practically identical to a slip-on except that 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. The stub end is mated with the lap joint flange and used together in piping systems. There are many uses for this type of assembly, from saving costs to creating joint systems.

Lap Joint Flanges are used with a corresponding stub-end that "inserts" in the inside of the flange. The main benefit of this type of flange, is that once the pipe welds to the insert stub-end, the flange then can rotate for easier alignment of the bolting holes. However, lap joint flanges and their stub-ends' ability to hold pressure is about the same as slip-on flanges. They are not suitable for situations with a high external or changing loads of force. They do provide an advantage in a piping system that needs frequent dismantling for inspection or to remove build-ups. If high pressure applications are being performed, either a swivel ring flange or an insert flange, is recommended to be used instead of a lap joint flange an stub-end. We can provide swivel ring flanges or insert flanges upon your request.