Interlock / Coverstitch comparison
JACK K7 vs JACK W5E-UT: which interlock / coverstitch machine should you buy?
A side-by-side look at two interlock / coverstitch machines from our catalog: the specifications each one lists, where they differ, and which kind of production each suits. Both are used for knitwear, activewear, garments.
JACK K7
Cylinder-bed interlock machine (K7-UT-01GB) with a wider 0.6–1.8 differential ratio range than the W4, a step-motor-driven upper trimmer and holder device, and a higher top speed of 6000 s.p.m.
JACK W5E-UT
Jack’s current computerized flat-bed interlock with an automatic thread trimmer — a step up from the older W4, built for elastic attaching, tape and waistband work.
Key differences
- JACK W5E-UT lists the higher top speed: 5500 s.p.m. against 4500 s.p.m.
- JACK W5E-UT lists an automatic thread trimmer; JACK K7 does not list one.
- Availability: JACK K7 — Order on request; JACK W5E-UT — Order on request. Call to confirm today's stock.
Specifications side by side
| Specification | JACK K7 | JACK W5E-UT |
|---|---|---|
| Model shown | K7-UT-01GB | — |
| Needle size | 10# | — |
| No. of needles / threads | 3 / 5 | — |
| Stitch length | 1.5–4.5mm | — |
| Differential ratio | 0.6–1.8 | — |
| Preset / max speed | 4500 / 6000 s.p.m. | — |
| Features | Step motor, upper trim, holder device | — |
| Weight | 51–61 kg | — |
| Availability | Order on request | Order on request |
| Series | — | Interlock (flat-bed), computerized |
| Max sewing speed | — | Up to 5500 s.p.m. |
| Feed | — | Full-automatic, auto thread trimmer |
| Controls | — | Digital speed display, one-key reset |
| Best for | — | T-shirts, underwear, jeans, mid-to-high-level clothing |
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 K7 if…
Cylinder-bed interlock machine (K7-UT-01GB) with a wider 0.6–1.8 differential ratio range than the W4, a step-motor-driven upper trimmer and holder device, and a higher top speed of 6000 s.p.m.
- Wider differential range
- Step-motor auto trimmer
- 6000 s.p.m. top speed
Choose the JACK W5E-UT if…
Jack’s current computerized flat-bed interlock with an automatic thread trimmer — a step up from the older W4, built for elastic attaching, tape and waistband work.
- Full-automatic auto trimmer
- One-key reset, digital display
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 K7 and the JACK W5E-UT?
JACK W5E-UT lists the higher top speed: 5500 s.p.m. against 4500 s.p.m. JACK W5E-UT lists an automatic thread trimmer; JACK K7 does not list one. Availability: JACK K7 — Order on request; JACK W5E-UT — Order on request. Call to confirm today's stock.
Which is better, the JACK K7 or the JACK W5E-UT?
It depends on your fabric, operation and daily volume. The JACK K7 is described as: Cylinder-bed interlock machine (K7-UT-01GB) with a wider 0.6–1.8 differential ratio range than the W4, a step-motor-driven upper trimmer and holder device, and a higher top speed of 6000 s.p.m. The JACK W5E-UT is described as: Jack’s current computerized flat-bed interlock with an automatic thread trimmer — a step up from the older W4, built for elastic attaching, tape and waistband work.
What is the price of the JACK K7 and the JACK W5E-UT?
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.