Jack H2-A-CZ

The H2-A-CZ is Jack's top-and-bottom-feed straight lockstitch machine for heavy material: a 750 W direct-drive motor mounted straight on the shaft, no belt, with a presser foot that lifts from 7 to 16 mm to handle leather, canvas and non-woven layers. Jack markets it for heavy material, and it sews up to 8 mm stitch length — wide enough for broad topstitching on bags, seat cushions and upholstery.

The stitch-length dial has a mechanical safety lock lever, and the alternating foot's throw is shown on a graduated scale so you can match feed to material thickness. The -12 version of the same machine reaches 12 mm stitch length for even bulkier work (curtains, carpets); the base H2-A-CZ stops at 8 mm.

It's built for an upholstery or leather shop running heavy material every day, not a general apparel lockstitch machine: the direct-drive motor cuts running cost but doesn't add the needle feed that more specialised industrials use to keep plies that slip against each other in line.