This research investigates the effects of measured quantities on determination of pitch diameter final value and suggest the reliable uncertainty budget for the results obtained from different measurement procedures. Mechanical probing measurements are used for the determination of parallel thread gauges pitch diameter, where three wire method is used for the plug gauges, while both T-sphere and V-jag methods are used for thread ring gauges respectfully. Effects of temperature and probe geometries on measured pitch diameter values are particualrly emphasised within the scope of this work. Measurement results with corresponding uncertainties were evalueated within EURAMET supplementary comparison, which was intiated and piloted by National Laboratory for Length in Croatia. This research has shown that comparison procedures and procedures for registration of CMC's in the CIPM MRA KCDB should be changed by the means of calibration categories. It is shown that measurement results within categories of Pitch diameter and Simple pitch diameter must be comparable and therefore only two categories should be considered in the future comparions and CMC's registrations. Measurements with the additional methods (V-jag method and measurement of axial-profile) were performed and compared with SCRV value of EURAMET.L-S21 comparison. Results of pitch diameter obtained from the measurement of axial profile did not show good comparability and therefore extended reasearch should be carried out. Results of pitch diameter obtained with the V-jag has shown good comparability and this method can be used for pitch diameter calibration at the height level of measurement uncertainties.