Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Components (hierarchy name)
4. components (objects parts)
5. [components by general context]
6. [joints and joint components]
7. joints (connections)
8. [joints by material joined]
9. metal joints
10. metal seams

Anotations

Scope note:

Sheet metal seams used primarily with light material, distinguished by an offset along the side of the seam. To make a grooved seam, the edges of both pieces are turned and hooked together; a grooving machine or other roller is run over the seam, creating an offset in the upper sheet, securing it so the seam does not come apart. Examples of uses for this seam are for joining two flat sheets, making longitudinal seams in round pipes, and vertical seams in articles having a flaring or cylindrical surface.