Key blank, key and cylinder lock with reduced costs

An article for use with a cylinder lock comprising:

• a cylinder lock body comprising at least two shells, each of said shells comprising a partial cylindrical wall that extends less than 360° about a longitudinal axis, said shells being affixed to each other with fasteners so that said partial cylindrical walls form a complete cylindrical wall that extends 360° about the longitudinal axis, and wherein each of said partial cylindrical walls is formed with a partially circumferential groove, and each of said partially circumferential grooves extends from an open end, located at a top of the cylindrical wall on which the partially circumferential groove is formed, circumferentially downwards to a closed end, and for each said closed end, a first axial notch extends axially from the closed end in a first direction and a second axial notch extends axially from the closed end in a second direction opposite to the first direction;
• and
• a plug rotatably mounted in said complete cylindrical wall of said cylinder lock body and comprising a plurality of chambers, separated by walls, wherein plug locking elements are disposed in said chambers, wherein at least one of said fasteners comprises a double resilient clasp comprising two clasps, each of said clasps having two opposite ends and each of said ends being formed with two outwardly extending tabs that extend axially with respect to the longitudinal axis, and wherein said double resilient clasp closes openings for said plug locking elements, and wherein said tabs are received in said axial notches.