Status of the LHC main dipole pre-series production

The procurement of a pre-series of 90 Main Dipole was decided as the first step towards the series production of 1232 Arc Main Dipoles within the LHC magnet program. The pre-series production is already completed at one Contractor's site and is approaching the completion at the other two companies. Technical aspects: manufacturing tolerances, manufacturing difficulties, first evaluation on Non-Conformities appearing during production and a short overview of magnet performance are presented.