Lockstitch comparison
JACK A4C vs JACK F6: 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. Both are used for shirts, wovens.
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 F6
Direct-drive computerized lockstitch machine running up to 5000 s.p.m. on a built-in silent servo motor, with oil-free semi-dry lubrication and a built-in thread-cutting knife for shirts, wovens and uniform work.
Key differences
- Both list the same top speed of 5000 s.p.m.
- JACK A4C lists an automatic thread trimmer; JACK F6 does not list one.
- Series: JACK A4C — Lockstitch (A-series, AI-integrated); JACK F6 — Lockstitch, direct drive.
- Presser foot lift (hand/auto): JACK A4C — 13mm / 6mm; JACK F6 — Manual, knee-operated.
- Motor: JACK A4C — Direct-drive integrated servo motor; JACK F6 — Built-in silent, energy-saving servo motor.
- Availability: JACK A4C — Order on request; JACK F6 — In stock. Call to confirm today's stock.
Specifications side by side
| Specification | JACK A4C | JACK F6 |
|---|---|---|
| Series | Lockstitch (A-series, AI-integrated) | Lockstitch, direct drive |
| Needle | DBx1, 11-18# | DBx1, 11-18# |
| Number of threads | 2 | 2 |
| Max stitch length | 5mm | 5mm |
| Presser foot lift (hand/auto) | 13mm / 6mm | Manual, knee-operated |
| Max sewing speed | 5000 s.p.m. | 5000 s.p.m. |
| Control system | Jack NTB system with Octopus "Nine-Brain" AI chip | — |
| Motor | Direct-drive integrated servo motor | Built-in silent, energy-saving servo motor |
| Feed | Computerized, auto-trimmer, auto backtack, auto foot lift | — |
| Availability | Order on request | In stock |
| Lubrication | — | Semi-dry head, oil-free |
| Thread trimming | — | Built-in knife, manual |
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 F6 if…
Direct-drive computerized lockstitch machine running up to 5000 s.p.m. on a built-in silent servo motor, with oil-free semi-dry lubrication and a built-in thread-cutting knife for shirts, wovens and uniform work.
- Built-in servo motor
- Built-in thread-cutting knife
- Oil-free semi-dry head
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 F6?
Both list the same top speed of 5000 s.p.m. JACK A4C lists an automatic thread trimmer; JACK F6 does not list one. Series: JACK A4C — Lockstitch (A-series, AI-integrated); JACK F6 — Lockstitch, direct drive.
Which is better, the JACK A4C or the JACK F6?
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 F6 is described as: Direct-drive computerized lockstitch machine running up to 5000 s.p.m. on a built-in silent servo motor, with oil-free semi-dry lubrication and a built-in thread-cutting knife for shirts, wovens and uniform work.
What is the price of the JACK A4C and the JACK F6?
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.