Saddle-stitching lines configured specifically for binding folded printed signatures into booklets or magazines — including collating, stitching, and trimming in a single inline system — are generally classified as bookbinding machinery. Standalone wire-stitching or stapling machines not integrated into a binding workflow may be classified differently. The key is whether the machine's principal function is the binding of printed matter.

Used bookbinding machinery imports require a commercial invoice stating the machine's age, condition, and transaction value, along with a packing list and bill of lading. If the equipment contains any controlled substances (e.g., certain hydraulic fluids or refrigerants in climate-controlled drying systems), EPA import requirements may apply. Importers should also verify whether any components are subject to separate classification — for example, integrated cutting or folding units that might be classifiable as distinct machines — and consult a licensed customs broker to structure the entry correctly.