Interlock / Coverstitch comparison
JACK JK-8670BDII/UT vs JACK K7-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 JK-8670BDII/UT
High-speed computerized small cylinder-bed interlock (180mm circumference) with auto thread trimming and a built-in cooling fan.
JACK K7-UT
Jack’s current cylinder-bed interlock, replacing the older K6 — an AI chip reads fabric thickness in real time and adapts automatically, from heavy to light fabric.
Key differences
- JACK K7-UT lists the higher top speed: 6000 s.p.m. against 4500 s.p.m.
- Series: JACK JK-8670BDII/UT — Interlock, small cylinder-bed; JACK K7-UT — Interlock (cylinder-bed), AI-integrated.
- Availability: JACK JK-8670BDII/UT — Order on request; JACK K7-UT — Order on request. Call to confirm today's stock.
Specifications side by side
| Specification | JACK JK-8670BDII/UT | JACK K7-UT |
|---|---|---|
| Series | Interlock, small cylinder-bed | Interlock (cylinder-bed), AI-integrated |
| Needle | UY128GAS, 11-14# | — |
| Max sewing speed | Up to 4500 s.p.m. | 6000 s.p.m. |
| Best for | T-shirts, underwear, jeans, mid-to-high-level clothing | T-shirts, underwear, jeans, mid-to-high-level clothing |
| Availability | Order on request | Order on request |
| Transport torque | — | 9.2Nm |
| Controls | — | Touch screen with voice guide |
| Feed | — | Active Feed system, auto thread trimmer |
| Build | — | Rhombic arm, 20mm edge-to-foot clearance; nano-ceramic thread guides |
| Vibration / noise | — | Reduced vibration and noise vs. previous generation |
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-8670BDII/UT if…
High-speed computerized small cylinder-bed interlock (180mm circumference) with auto thread trimming and a built-in cooling fan.
- Small cylinder-bed design
- Runs up to 4500 s.p.m.
Choose the JACK K7-UT if…
Jack’s current cylinder-bed interlock, replacing the older K6 — an AI chip reads fabric thickness in real time and adapts automatically, from heavy to light fabric.
- Adapts to fabric thickness
- 20mm clearance rhombic arm
- 9.2Nm transport torque
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-8670BDII/UT and the JACK K7-UT?
JACK K7-UT lists the higher top speed: 6000 s.p.m. against 4500 s.p.m. Series: JACK JK-8670BDII/UT — Interlock, small cylinder-bed; JACK K7-UT — Interlock (cylinder-bed), AI-integrated. Availability: JACK JK-8670BDII/UT — Order on request; JACK K7-UT — Order on request. Call to confirm today's stock.
Which is better, the JACK JK-8670BDII/UT or the JACK K7-UT?
It depends on your fabric, operation and daily volume. The JACK JK-8670BDII/UT is described as: High-speed computerized small cylinder-bed interlock (180mm circumference) with auto thread trimming and a built-in cooling fan. The JACK K7-UT is described as: Jack’s current cylinder-bed interlock, replacing the older K6 — an AI chip reads fabric thickness in real time and adapts automatically, from heavy to light fabric.
What is the price of the JACK JK-8670BDII/UT and the JACK K7-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.