After confirmation, which revision is binding if we send a new drawing?

STEP owns shape; PDF / DWG own tolerances and notes. The binding pack is the revision written on the engineer confirmation and PO (drawing number + rev in the filename). If PDF and STEP disagree, we pause a locked price until you align them.

A new drawing after T/T or after first ops is a change order: engineering reviews (target 12 h, Dongguan UTC+8). The lead-time clock starts from the new confirmation, not the first upload. Material already issued or chips already cut is quoted extra or as scrap — we do not quietly recut to Rev B on the old amount.

Do not reuse an old FAI / CMM on new geometry. Prefer one STEP ≤80 MB. Preview still needs no login; sign in to save or order. No implants.

Related process guide