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For the upgrade of the ATLAS muon spectrometer in March 2014 new muontracking chambers (sMDT) with drift-tubes of 15 mm diameter, half of the valueof the standard ATLAS Monitored Drift-Tubes (MDT) chambers, and 10~$\mu$mpositioning accuracy of the sense wires have been constructed. The new chambersare designed to be fully compatible with the present ATLAS services but, withrespect to the previously installed ATLAS MDT chambers, they are assembled in amore compact geometry and they deploy two additional tube layers that provideredundant rack information. The chambers are composed of 8 layers of in total624 aluminium drift-tubes. The assembly of a chamber is completed within aweek. A semi-automatized production line is used for the assembly of thedrift-tubes prior to the chamber assembly. The production procedures and thequality control tests of the single components and of the complete chamberswill be discussed. The wire position in the completed chambers have beenmeasured by using a coordinate measuring machine.

Construction and test of high precision drift-tube (sMDT) chambers for the ATLAS muon spectrometer