Match identity to the record
A lot number can connect a group of parts to shared production information. An individual serial number can distinguish one item from the others. Decide what questions the business needs to answer during inspection, service or a quality investigation. The mark is useful only if the associated record is maintained and the identifier is captured correctly.
Design the numbering rules
Specify permitted characters, leading zeros and any prefixes. Identify who generates and approves the data before marking. Avoid relying on an operator to improvise the next number from a previous order. For a lot with several part variants, make clear whether the same numbering sequence spans all variants or whether separate sequences are required.
Account for rejected and replacement parts
A production record should explain skipped numbers, scrap and replacements. Decide whether a replacement receives a new identifier or follows a customer-defined rule. Prevent rejected parts from returning to the accepted lot without review. At shipment, reconcile the physical quantity and identifiers with the agreed record. This gives the mark a reliable connection to the manufacturing history.