Standard Transportation Commodity Code Master records (X12 435) establish and maintain standardized classification codes for goods transported across supply chains. Typically sent by logistics service providers, carriers, or industry standards organizations to trading partners—including shippers, freight forwarders, and distribution networks—the 435 transaction set organizes commodity information in structured segments. The core structure includes the SID (Standard Transportation Commodity Code Identification) segment, which assigns the classification code itself; the N9 (Reference Identification) segment, which links related identifiers or external references; and the DTM (Date/Time Reference) segment, which timestamps when the code became effective or was last updated.

For example, a major freight classification service such as StandardTrans Inc. might send an X12 435 transaction set to regional carriers like RegionalFreight LLC and nationwide logistics provider AllShip Corporation to distribute updates when the National Motor Freight Classification (NMFC) commodity codes change annually. The SID segment would specify the exact code (such as “100.00” for certain automotive parts), while optional LX loop sections within the 435 could detail hazardous material properties for classified goods through LH3, LH2, and related hazmat segments, ensuring all carriers apply consistent handling rules. Reference numbers in N9 segments would tie each code update to the official classification document version, enabling carriers to verify they are using current, compliant codes for billing, routing, and regulatory compliance purposes.