date stamp, batch code, lot number, traceability code, manufacturing code
Date codes are typically four digits: year and calendar week, so 2418 means week 18 of 2024. Lot or batch codes are manufacturer-specific and appear on the reel, bag or box label, and often in the packing documentation. On connectivity components the codes usually live on the packaging rather than on the part, which makes the packaging part of the evidence.
They matter for three reasons.
Age. Elastomer seals, adhesives and some plated contacts have shelf-life guidance. Very old stock is not automatically bad, but it is something the buyer should know before it goes into a harness.
Consistency. A single order that arrives with a wide spread of unrelated date codes, mismatched label fonts, or re-labelled packaging is a signal worth stopping on. Genuine channel stock tends to be batch-coherent.
Recall and containment. If a defect surfaces months later, the lot code is what limits the investigation to the affected batches instead of the whole build.
Harness Code checks date and lot codes on incoming shortage stock, keeps the supplier chain documented for each order, and passes the codes on. That is a factual traceability practice under an ISO 9001:2015 quality system certified by AQ Cert. It is not a certified authenticity guarantee, and no honest independent distributor should present it as one.
Related terms
Counterfeit risk and verified sourcing channels
Counterfeit risk is the risk of receiving fake, re-labelled, recycled or out-of-specification components presented as genuine. It rises sharply for parts that are scarce, obsolete or on allocation, which is exactly when buyers are forced outside their usual channels.
Obsolete / End-of-Life (EOL) component
An obsolete or End-of-Life component is one the manufacturer has stopped producing. It usually passes through an NRND warning and a last-time-buy window first, after which the only remaining supply is existing channel stock, excess inventory, or a qualified alternative.
Wire seal and cavity plug
A wire seal is a rubber grommet crimped with the terminal that seals the gap between the wire and the connector cavity. A cavity plug seals an unused cavity. Together they give a sealed connector its rated ingress protection; a single missing seal voids it.