What is  stub end used for ? 

Stainless steel Stub ends and collar

Stainless steel Stub Ends and stainless steel collars are fittings used in place of welded flanges where rotating back up flanges are desired. They are also called Lap Joints and Collars. A rotating back up flange seats itself against the back surface of the Stub End. When bolts are added, the clamping action of the bolts presses the rotating back up flange against the back of the Stub End...........

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