Key for a cylinder lock, especially for locking systems

A key for a cylinder lock having a cylinder core rotatable in a cylinder body, said cylinder body being formed with tumbler pins engageable with the key and said core having a cylindrical periphery and a key-receiving channel open at said periphery, said key comprising:

• a handle;
• an abutment formed on said handle;
• and
• an elongated blade extending from said abutment, said blade being formed with:
• a back conforming substantially to said periphery,
• a profile region formed with said back and having opposite flanks adapted to be formed with longitudinal grooves establishing a profiling of said profile region and controlling insertion of said blade in said core, and
• a bitting region having a bar configuration adjacent said profile region and extending longitudinally over the full length of the blade, said bitting region accommodating a plurality of rows of recesses engageable by said tumbler pins, said bitting region being wider than said profile region and being rounded generally cylindrically, said bitting region extending to said abutment, said profile region of said blade in a radial direction having a height (H) greater than a height (h) of said bitting region, said profile region having generally parallel flanks and said bitting region extending outwardly on opposite sides of said blade beyond said flanks, said profile region being formed with at least one transverse throughgoing bore, said key further comprising a respective test pin limitedly shiftable in said bore, beveled at opposite ends and of a length greater than a thickness of said profile region.