Lockstitch comparison
JACK A3C 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 A3C
Computerized single-needle lockstitch machine with auto thread trimmer, from Jack’s A-series — a step up from the A2C with Jack’s newer intelligent control system.
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
- JACK A3C lists an automatic thread trimmer; JACK H7 does not list one.
- Series: JACK A3C — Lockstitch (A-series); JACK H7 — Heavy-Duty, digitalized top feed.
- Presser foot lift (hand/auto): JACK A3C — 13mm / 6mm; JACK H7 — 16 adjustable levels, stepper-motor controlled.
- Motor: JACK A3C — Direct-drive integrated servo motor; JACK H7 — 750W integrated motor.
- Controls: JACK A3C — Intelligent operation panel, one-key reset; JACK H7 — Digital knee lifter with micro-lift, double-row LED lights.
- Best for: JACK A3C — General garment stitching, production lines; JACK H7 — Sofa, car seat, luggage, gloves, bags, shoes.
- Availability: JACK A3C — Order on request; JACK H7 — Order on request. Call to confirm today's stock.
Specifications side by side
| Specification | JACK A3C | JACK H7 |
|---|---|---|
| Series | Lockstitch (A-series) | Heavy-Duty, digitalized top feed |
| Needle | DBx1, 11-18# | — |
| Number of threads | 2 | — |
| Max stitch length | 5mm | — |
| Presser foot lift (hand/auto) | 13mm / 6mm | 16 adjustable levels, stepper-motor controlled |
| Max sewing speed | 5000 s.p.m. | — |
| Motor | Direct-drive integrated servo motor | 750W integrated motor |
| Controls | Intelligent operation panel, one-key reset | Digital knee lifter with micro-lift, double-row LED lights |
| Feed | Computerized, auto-trimmer, auto backtack, auto foot lift | — |
| Best for | General garment stitching, production lines | Sofa, car seat, luggage, gloves, bags, shoes |
| Availability | Order on request | Order on request |
| Stitch length | — | 1.3mm – 5.5mm, graduated adjustment |
| Material capability | — | Pierces 10+ layers of leather; handles 8 layers cleanly |
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 A3C if…
Computerized single-needle lockstitch machine with auto thread trimmer, from Jack’s A-series — a step up from the A2C with Jack’s newer intelligent control system.
- One-key reset panel
- Auto trim, backtack & foot lift
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 A3C and the JACK H7?
JACK A3C lists an automatic thread trimmer; JACK H7 does not list one. Series: JACK A3C — Lockstitch (A-series); JACK H7 — Heavy-Duty, digitalized top feed. Presser foot lift (hand/auto): JACK A3C — 13mm / 6mm; JACK H7 — 16 adjustable levels, stepper-motor controlled.
Which is better, the JACK A3C or the JACK H7?
It depends on your fabric, operation and daily volume. The JACK A3C is described as: Computerized single-needle lockstitch machine with auto thread trimmer, from Jack’s A-series — a step up from the A2C with Jack’s newer intelligent control system. 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 A3C 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.