Lockstitch comparison
JACK A4C vs JACK A6F-E: 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, garments.
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 A6F-E
Digital needle-feed computerized lockstitch with a sealed oil pan and a large 300mm sewing space — feeds smoothly with no short thread tail.
Key differences
- JACK A4C lists the higher top speed: 5000 s.p.m. against 4000 s.p.m.
- JACK A4C lists an automatic thread trimmer; JACK A6F-E does not list one.
- Series: JACK A4C — Lockstitch (A-series, AI-integrated); JACK A6F-E — Lockstitch, needle feed.
- Needle: JACK A4C — DBx1, 11-18#; JACK A6F-E — DBx1, 11-18# / DPx5, 18-21#.
- Availability: JACK A4C — Order on request; JACK A6F-E — Order on request. Call to confirm today's stock.
Specifications side by side
| Specification | JACK A4C | JACK A6F-E |
|---|---|---|
| Series | Lockstitch (A-series, AI-integrated) | Lockstitch, needle feed |
| Needle | DBx1, 11-18# | DBx1, 11-18# / DPx5, 18-21# |
| Number of threads | 2 | — |
| Max stitch length | 5mm | — |
| Presser foot lift (hand/auto) | 13mm / 6mm | — |
| Max sewing speed | 5000 s.p.m. | Up to 4000 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 | — |
| Availability | Order on request | Order on request |
| Sewing space | — | 300mm, large operating area |
| Lubrication | — | Sealed oil pan, no oil stains |
| Best for | — | Shirts, suits, pants, down jackets |
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 A6F-E if…
Digital needle-feed computerized lockstitch with a sealed oil pan and a large 300mm sewing space — feeds smoothly with no short thread tail.
- 300mm sewing space
- Sealed, stain-free oil pan
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 A6F-E?
JACK A4C lists the higher top speed: 5000 s.p.m. against 4000 s.p.m. JACK A4C lists an automatic thread trimmer; JACK A6F-E does not list one. Series: JACK A4C — Lockstitch (A-series, AI-integrated); JACK A6F-E — Lockstitch, needle feed.
Which is better, the JACK A4C or the JACK A6F-E?
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 A6F-E is described as: Digital needle-feed computerized lockstitch with a sealed oil pan and a large 300mm sewing space — feeds smoothly with no short thread tail.
What is the price of the JACK A4C and the JACK A6F-E?
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.