Lap Joint Flanges

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Lap joint flanges use a stub end that is welded to the pipe. A ring flange fits loosely around the stub end, permitting easy flange alignment of the bolt holes. A lap joint flange is also called Van Stone or Stub Flange. The stub ends are available in three styles (Types A, B, and C) and two lengths (Short and Long).

Trupply offers Lap Joint Flange in A105N, A105, SS316, SS304, A20, High Yield & Nickel Alloys. Email sales@trupply.com for all your flange buying needs.

The video below gives an overview of lap joint flange.

Video Transcript:

This is a lap joint flange. The difference between a lap joint flange and a slip on flange (I want to show you a slip on flange, which looks very similar), from the outside it almost looks like the same. But you look on the backside, it has a little radius and a little end right here. Some people confuse this with a flat faced flange. It is not. If you look at the difference, just look at the backside, you will see that this is different because it has a little radius. I’ll show you right now why it has a little radius (the lap joint flange).

For example, I have the same flange in stainless steel. This is a stainless steel 304 flange. Whenever you’re using a lap joint flange, you use a stub end. The radius is for the stub end, so you do like this and that’s why it’s called a lap joint flange. You need to have a stub end and that is the purpose of that little radius right there.