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1. Describe the commodity precisely. Material + form + packaging: "crated wooden chairs", not "furniture". The NMFC classifies the thing, not the category.
2. Check the classification type. Results marked density-based follow the 13-tier scale — verify with the freight class calculator. Results marked item-specific get their class from the NMFC item itself.
3. Confirm before booking. This tool covers commonly cited classifications for common commodities. The full official database is ClassIT (NMFTA, subscription). The NMFC item description controls — always verify before booking.
4. Watch the dockets. Docket 2025-1 consolidated ~2,000 items in July 2025; Docket 2026-1 canceled more in February 2026. A code you used last year may be retired.
Commonly cited classifications for reference, independently compiled from publicly cited carrier and industry sources. The NMFC item description controls — verify your exact commodity in ClassIT or with your carrier before booking.