The seam structural is common method used in fabrication and joining two piece sheet piercing together to form a large wrap-around section for square, rectangular and round pipe. The seam provides a positive mechanical connection between adjacent sheet.
Lock (Upper + Lower)
The Upper sheet ready to locked over the edge strip in a 12mm joint minimum
.
Hocked Assembly
This seam provides for a mechanical connection between the upper and lower sheet
Flattened
The lock are tight and will not bread open when bent, flattened or twisted
.