Lockstitch comparison
JACK A4C vs JACK Z7: which lockstitch machine should you buy?
A side-by-side look at two lockstitch machines from our catalog: the specifications each one lists, where they differ, and which kind of production each suits.
JACK A4C
AI-integrated lockstitch machine running the Jack NTB control system with the Octopus "Nine-Brain" chip — direct-drive servo motor, auto thread trimmer, auto backtack and auto foot lift at up to 5000 s.p.m.
JACK Z7
Heavy-duty computerized lockstitch machine with triple transport — needle feed plus top and bottom feed together — controlled from a full digital touch panel, for sofas, car seats, luggage and heavy leather goods.
Key differences
- JACK A4C lists an automatic thread trimmer; JACK Z7 does not list one.
- Series: JACK A4C — Lockstitch (A-series, AI-integrated); JACK Z7 — Heavy-Duty, triple transport.
- Feed: JACK A4C — Computerized, auto-trimmer, auto backtack, auto foot lift; JACK Z7 — Needle feed + top feed + bottom feed (triple transport).
- Availability: JACK A4C — Order on request; JACK Z7 — Order on request. Call to confirm today's stock.
Specifications side by side
| Specification | JACK A4C | JACK Z7 |
|---|---|---|
| Series | Lockstitch (A-series, AI-integrated) | Heavy-Duty, triple transport |
| Needle | DBx1, 11-18# | — |
| Number of threads | 2 | — |
| Max stitch length | 5mm | — |
| Presser foot lift (hand/auto) | 13mm / 6mm | — |
| Max sewing speed | 5000 s.p.m. | — |
| Control system | Jack NTB system with Octopus "Nine-Brain" AI chip | — |
| Motor | Direct-drive integrated servo motor | — |
| Feed | Computerized, auto-trimmer, auto backtack, auto foot lift | Needle feed + top feed + bottom feed (triple transport) |
| Availability | Order on request | Order on request |
| Controls | — | Full digital touch panel |
| Best for | — | Sofa, car seat, luggage, heavy leather goods |
Highlighted rows differ. A dash means the catalog does not list that specification for the machine; ask us and we will confirm it.
Which one fits your work?
Choose the JACK A4C if…
AI-integrated lockstitch machine running the Jack NTB control system with the Octopus "Nine-Brain" chip — direct-drive servo motor, auto thread trimmer, auto backtack and auto foot lift at up to 5000 s.p.m.
- AI Nine-Brain chip
- Auto trim, backtack & foot lift
- Direct-drive servo motor
Choose the JACK Z7 if…
Heavy-duty computerized lockstitch machine with triple transport — needle feed plus top and bottom feed together — controlled from a full digital touch panel, for sofas, car seats, luggage and heavy leather goods.
- Triple transport feed
- Full digital touch panel
Swami Enterprises is an authorized JACK dealer and importer. Bring your own fabric to the Chanakya Place showroom and sew on both before you decide.
Questions buyers ask
What is the difference between the JACK A4C and the JACK Z7?
JACK A4C lists an automatic thread trimmer; JACK Z7 does not list one. Series: JACK A4C — Lockstitch (A-series, AI-integrated); JACK Z7 — Heavy-Duty, triple transport. Feed: JACK A4C — Computerized, auto-trimmer, auto backtack, auto foot lift; JACK Z7 — Needle feed + top feed + bottom feed (triple transport).
Which is better, the JACK A4C or the JACK Z7?
It depends on your fabric, operation and daily volume. The JACK A4C is described as: AI-integrated lockstitch machine running the Jack NTB control system with the Octopus "Nine-Brain" chip — direct-drive servo motor, auto thread trimmer, auto backtack and auto foot lift at up to 5000 s.p.m. The JACK Z7 is described as: Heavy-duty computerized lockstitch machine with triple transport — needle feed plus top and bottom feed together — controlled from a full digital touch panel, for sofas, car seats, luggage and heavy leather goods.
What is the price of the JACK A4C and the JACK Z7?
Prices depend on the model, quantity and the day. Call +91 99713 36656 or request a quote for today's price on either machine.
Can I see both machines before buying?
Yes. Visit the showroom at Chanakya Place, New Delhi. Call +91 99713 36656 first so the team can confirm which models are on display and in stock.
Not sure which to pick?
Tell us your fabric, operation and daily volume. A specialist will recommend one, with today's price.