Lockstitch comparison
JACK JK-58450J vs JACK H7: 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 JK-58450J
Double-needle computerized lockstitch with auto cornering and a large sewing space — built-in presser-foot lifter, one-shaft drive.
JACK H7
Jack’s current top-feed heavy-duty lockstitch, replacing the older H5/H6 — pierces 10+ layers of leather with a fully digital, 16-level presser foot lift.
Key differences
- Series: JACK JK-58450J — Lockstitch, double needle; JACK H7 — Heavy-Duty, digitalized top feed.
- Best for: JACK JK-58450J — Umbrella, denim, T-shirt (chain-stitch work); JACK H7 — Sofa, car seat, luggage, gloves, bags, shoes.
- Availability: JACK JK-58450J — Order on request; JACK H7 — Order on request. Call to confirm today's stock.
Specifications side by side
| Specification | JACK JK-58450J | JACK H7 |
|---|---|---|
| Series | Lockstitch, double needle | Heavy-Duty, digitalized top feed |
| 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) | Sofa, car seat, luggage, gloves, bags, shoes |
| Availability | Order on request | Order on request |
| Motor | — | 750W integrated motor |
| Presser foot lift | — | 16 adjustable levels, stepper-motor controlled |
| Stitch length | — | 1.3mm – 5.5mm, graduated adjustment |
| Material capability | — | Pierces 10+ layers of leather; handles 8 layers cleanly |
| Controls | — | Digital knee lifter with micro-lift, double-row LED lights |
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 H7 if…
Jack’s current top-feed heavy-duty lockstitch, replacing the older H5/H6 — pierces 10+ layers of leather with a fully digital, 16-level presser foot lift.
- 16-level stepper foot lift
- Pierces 10+ leather layers
- 1.3-5.5mm stitch range
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 H7?
Series: JACK JK-58450J — Lockstitch, double needle; JACK H7 — Heavy-Duty, digitalized top feed. Best for: JACK JK-58450J — Umbrella, denim, T-shirt (chain-stitch work); JACK H7 — Sofa, car seat, luggage, gloves, bags, shoes. Availability: JACK JK-58450J — Order on request; JACK H7 — Order on request. Call to confirm today's stock.
Which is better, the JACK JK-58450J or the JACK H7?
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 H7 is described as: Jack’s current top-feed heavy-duty lockstitch, replacing the older H5/H6 — pierces 10+ layers of leather with a fully digital, 16-level presser foot lift.
What is the price of the JACK JK-58450J and the JACK H7?
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.