Lockstitch comparison
JACK JK-58450J vs JACK A4C: 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 JK-58450J
Double-needle computerized lockstitch with auto cornering and a large sewing space — built-in presser-foot lifter, one-shaft drive.
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.
Key differences
- JACK A4C lists the higher top speed: 5000 s.p.m. against 3000 s.p.m.
- JACK A4C lists an automatic thread trimmer; JACK JK-58450J does not list one.
- Series: JACK JK-58450J — Lockstitch, double needle; JACK A4C — Lockstitch (A-series, AI-integrated).
- Needle: JACK JK-58450J — DPx5, multiple gauges; JACK A4C — DBx1, 11-18#.
- Availability: JACK JK-58450J — Order on request; JACK A4C — Order on request. Call to confirm today's stock.
Specifications side by side
| Specification | JACK JK-58450J | JACK A4C |
|---|---|---|
| Series | Lockstitch, double needle | Lockstitch (A-series, AI-integrated) |
| Needle | DPx5, multiple gauges | DBx1, 11-18# |
| Max sewing speed | Up to 3000 s.p.m. | 5000 s.p.m. |
| Feature | Auto cornering, built-in presser-foot lifter | — |
| Best for | Umbrella, denim, T-shirt (chain-stitch work) | — |
| Availability | Order on request | Order on request |
| Number of threads | — | 2 |
| Max stitch length | — | 5mm |
| Presser foot lift (hand/auto) | — | 13mm / 6mm |
| 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 |
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 JK-58450J if…
Double-needle computerized lockstitch with auto cornering and a large sewing space — built-in presser-foot lifter, one-shaft drive.
- Auto cornering
- Built-in presser-foot lifter
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
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 JK-58450J and the JACK A4C?
JACK A4C lists the higher top speed: 5000 s.p.m. against 3000 s.p.m. JACK A4C lists an automatic thread trimmer; JACK JK-58450J does not list one. Series: JACK JK-58450J — Lockstitch, double needle; JACK A4C — Lockstitch (A-series, AI-integrated).
Which is better, the JACK JK-58450J or the JACK A4C?
It depends on your fabric, operation and daily volume. The JACK JK-58450J is described as: Double-needle computerized lockstitch with auto cornering and a large sewing space — built-in presser-foot lifter, one-shaft drive. 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.
What is the price of the JACK JK-58450J and the JACK A4C?
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.