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Jack

Catalog

Lockstitch

Single-needle straight stitch for garment, denim, and leather work.

12 models

Lockstitch machine

  • ISO 9001 certified

    Quality management standard maintained on every machine that leaves the line.

  • Authorized US dealers

    Sales, parts, and trained technicians across the United States.

  • Genuine Jack parts

    Feed dogs, hooks, gauge sets. Original parts traceable to the manufacturer.

  • Industrial heritage

    Decades of continuous machinery development across apparel, denim, and leather.

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What is a lockstitch machine?

A lockstitch is the straight seam made by a single needle thread interlocking with a bobbin thread inside the fabric — identical on both sides and strong enough for almost any garment, denim, or leather work. A single-needle lockstitch machine is the most common machine on a production floor, and it's where most shops start.

How to choose a lockstitch machine

Choosing a lockstitch comes down to speed, feed, and automation. For light-to-medium garment work, a high-speed drop-feed machine like the JACK A5E-B (5,000 SPM, direct-drive servo, auto-trim, AI material sensing) covers most of it. For matched-ply topstitching where the layers can't shift, a needle-feed machine like the A6F holds the plies together. Double-needle models lay two parallel rows in one pass for strong, even topstitching. Decide how much automation you want as standard — automatic thread trimming and presser-foot lift save real time over a shift — and whether your heaviest seams need the extra torque of a walking foot instead.

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Other machine families

Browse the full Jack catalog

Each family covers a different production task. Pick the one that matches the work.