Lot Number

A Lot Number is a unique identifier used in foreign trade to mark goods from the same production batch. It is typically assigned by the manufacturer or exporter for quality traceability, inventory management, and claim handling. Usage scenarios include: requiring the lot number to be stated in contracts and letters of credit; marking the lot number on documents such as packing lists, invoices, and bills of lading; and printing the lot number on outer packaging for identification. Precautions: the lot number must be consistent across all documents, otherwise it may cause customs clearance delays or bank refusal of payment; if the letter of credit specifies a lot number, it must be copied exactly and must not be changed unilaterally; goods from different batches should be packed separately and marked with different lot numbers to avoid confusion. Difference from 'Shipping Mark': a shipping mark is a transport mark used to identify the consignee and destination; a lot number is a production management mark used to trace a specific production batch. Difference from 'Serial Number': a serial number is a unique number for an individual product, while a lot number corresponds to a group of products produced in the same batch.