Flange types

H1 Flange forges flanges. These are the types buyers usually name on an inquiry.

Weld neck

A weld neck flange has a long hub and is butt-welded to the pipe.

Slip-on

The pipe slips into the flange, then the joint is welded.

Socket weld

Used on smaller pipe. The pipe sits in a socket and is fillet welded.

Threaded

The joint is screwed, not welded.

Lap joint

Used with a stub end. The flange itself is not welded to the pipe.

Blind

A blind flange closes the end of a pipe or a vessel nozzle.

Custom forged

A flange made to a drawing when the type is not one of the standard shapes above.

The governing standard and the drawing decide the exact dimensions.