Lockstitch comparison
JACK JK-58450J vs JACK S7: 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 S7
Jack’s current digitalized post-bed machine — three independent stepper motors and a 5-inch touch screen for accurate, noiseless roller-feed sewing.
Key differences
- Series: JACK JK-58450J — Lockstitch, double needle; JACK S7 — Post bed, digitalized.
- Best for: JACK JK-58450J — Umbrella, denim, T-shirt (chain-stitch work); JACK S7 — Shirts, jeans, non-woven bags, shoes, bags.
- Availability: JACK JK-58450J — Order on request; JACK S7 — Order on request. Call to confirm today's stock.
Specifications side by side
| Specification | JACK JK-58450J | JACK S7 |
|---|---|---|
| Series | Lockstitch, double needle | Post bed, digitalized |
| Needle | DPx5, multiple gauges | — |
| Max sewing speed | Up to 3000 s.p.m. | — |
| Feature | Auto cornering, built-in presser-foot lifter | — |
| Best for | Umbrella, denim, T-shirt (chain-stitch work) | Shirts, jeans, non-woven bags, shoes, bags |
| Availability | Order on request | Order on request |
| Motors | — | 3 stepper motors (needle bar + two rollers) plus main shaft motor |
| Screen | — | 5-inch multilanguage touch screen |
| Thread trimmer | — | Short-thread cut to 3mm precision |
| Perforation capacity | — | Penetrates 110+ layers of A4 paper |
| Connectivity | — | Industry 4.0 WiFi module (optional) |
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 S7 if…
Jack’s current digitalized post-bed machine — three independent stepper motors and a 5-inch touch screen for accurate, noiseless roller-feed sewing.
- 3 stepper motors + main shaft
- 3mm-precision thread trim
- 110+ layer perforation capacity
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 S7?
Series: JACK JK-58450J — Lockstitch, double needle; JACK S7 — Post bed, digitalized. Best for: JACK JK-58450J — Umbrella, denim, T-shirt (chain-stitch work); JACK S7 — Shirts, jeans, non-woven bags, shoes, bags. Availability: JACK JK-58450J — Order on request; JACK S7 — Order on request. Call to confirm today's stock.
Which is better, the JACK JK-58450J or the JACK S7?
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 S7 is described as: Jack’s current digitalized post-bed machine — three independent stepper motors and a 5-inch touch screen for accurate, noiseless roller-feed sewing.
What is the price of the JACK JK-58450J and the JACK S7?
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.