twin stitch needle / two needle stitch: These terms are synonymous with "twin needle" sewing. A "twin stitch needle" is a single needle shank that holds two needles, allowing a sewing machine to create a "two needle stitch" — two parallel lines of stitching in a single pass. Longsew manufactures industrial machines specifically designed to leverage this technique for speed and consistency.

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lock stitch sewing machine drawing / 301 lock stitch: Longsew provides detailed technical documentation, including "lock stitch sewing machine" diagrams and "drawings" for maintenance and parts identification. The "301 lock stitch" is a specific ISO standard designation for a basic, straight lockstitch, which is the primary stitch produced by their core range of industrial machines.

double needle embroidery machine: This refers to an industrial embroidery machine equipped with a "double needle" setup. Longsew manufactures such machines, which allow for the simultaneous application of two threads in an embroidery pattern, increasing efficiency and enabling specific decorative effects that require two parallel lines of stitching.

bobbinless lockstitch sewing machine: A specialty product from Longsew is the "bobbinless lockstitch sewing machine." This machine creates a true lockstitch without using a traditional bobbin. Instead, it uses a looper and a second needle thread, eliminating the need to stop and replace bobbins, which significantly increases efficiency in high-volume production settings.