Adding a Basic Spec Nipun Girotra July 30, 2015 04:46 A basic spec (e.g. X-position, Y-position, Z-position) requires only a Nominal value. Leave all other values blank. Related articles Adding a Note type spec Adding a GD&T Spec (Geometric Dimensioning & Tolerancing) Adding a Manufacturing Dimension (Mfg. Dim.) Adding Surface Profile to a QC Plan Adding or Inactivating Users