NAICS 3335 is the four-digit subsector, while 33351 is the five-digit industry group — in this case they cover identical scope. The distinction matters primarily for statistical reporting: the five-digit level is used in Census Bureau manufacturing surveys and shipment data, allowing more granular comparison of domestic production against import volumes tracked under HTS codes.

Key landed-cost drivers include the applicable HTS duty rate, any Section 301 surcharges for Chinese-origin equipment, freight and insurance costs (which can be substantial for heavy capital equipment), and port-of-entry handling fees. Currency fluctuations also play a significant role given that major suppliers price in euros or yen. Importers should model total landed cost — not just the invoice price — when evaluating sourcing decisions.