What do a.m. and p.m. stand for?

lock seam

a joint between two pieces of sheet metal, made by folding up the overlapping edges against each other, then folding them over in the same direction a number of times.
Origin of lock seam
1955-60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for lock seam
  • The bar riser, space type shall be helically corrugated pipe with a continuous welded or lock seam.
  • Panels shall be field seamed by machine creating a vertical lock seam.
  • At valleys, edges of individual roofing sheets will require custom fitting to provide proper flat lock seam.
  • The fasteners are located in the lock seam of each shingle.
  • The ferrule shall have a lock seam and shall be crimped to the handle.

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