Precison fabrication typically starts with parts requiring a tolerance of +/- 0.25mm /0.010″. While very large frames can well be considered precision at much higher numbers for the typical industrial project, this is a significant dividing line for “fabrication,” and under this, becomes a consideration for machining as part of the process.
Precision fabricated parts may require tighter tolerance on an individual face, from location to location, without adding much, if any, cost. But when GDT tolerances enter the picture, costs start to climb quickly.
Such features as press fit bearing fall under precision fabrication and require tolerance that are down in the micron / tenths of a thou. Seaborn takes pride in delivery high quality precision fabricated parts every working day.