lock seam

lock seam, lock joint

A joint or seam in sheet-metal roofing; the two edges are bent over in the form of hooks which are inserted in each other; then they are dressed down to form a seam.
References in periodicals archive ?
Finally, thermal deformation was controlled by adoption of an adhesive agent with low elastic modulus and the optimised position of the 3D Lock Seam.
1) Technology to join dissimilar materials: adoption of "3D Lock Seam" structure, where the steel panel and aluminum panel are layered and hemmed together twice.
A heavy-duty threaded base plate is joined to the can with a rolled leak-proof lock seam.