lock joint

lock joint

[′läk ‚jȯint]
(design engineering)
A joint made by interlocking the joined elements, with or without other fastening.

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 ?
Steel Warehouse's sister company Lock Joint Tube ljtube.com, produces mechanical and structural grade steel tubing.
It's a rhythmic movement: Don't lock joints or hunch forward for momentum.