Jack S7

Name: Jack S7
Brand: Jack
Author: SewingSpecs

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Data from official source

Sheet curated by SewingSpecs — We check every spec sheet against the manufacturer's own documentation: each value carries its source and the date we read it. Published Sept. 18, 2026 · Last updated Sept. 19, 2026

The S7 is a post-bed machine with a motorized double roller feed, built for already-shaped pieces that a flat table cannot turn: shoe uppers, bags, suitcases, gloves and leather goods where the seam follows a three-dimensional curve. The upper and lower rollers and the needle are each driven by their own stepper motor, so the stitch stays accurate even where the length would otherwise shrink on a corner.
The backtack lever is quiet (the manufacturer rates it at 20 dB against 50-60 dB for normal speech) and the handwheel doubles as a fan to keep the internal parts cooler. The 5-inch touch panel switches speed, stitch length and sewing mode; a simpler button-panel version also exists.
This is not a flatbed machine: the slim post makes it easier to reach tight spots, but it is still built for bulky, already-shaped pieces rather than flat fabric.

01 · Verified data

Technical specifications

Parameter	Value	Source
Maximum speed	2500 spm	Declared by the brand
Maximum stitch length	5 mm	Declared by the brand
Maximum presser foot lift	12 mm	Declared by the brand
Needle system	DPx5	Declared by the brand
Needle size range	9-23#	Declared by the brand
Automatic functions	Automatic thread trimmer, Automatic backtack, Automatic foot lifter	Declared by the brand
Needle bar stroke	41 mm	Declared by the brand
Bed type	Post bed	Declared by the brand

02 · Summary

Pros and cons

In favour

Independently motorized upper and lower rollers: stitch length does not shrink around a curve. source
Quiet backtacking: the maker rates it at 20 dB, against 50-60 dB for normal speech. source
Thread trimmer, reverse stitching and presser foot lift are automatic.
5-inch touch panel: switches between free sewing, fixed-stitch and programmable sewing. source

Worth knowing

Built for bulky, already-shaped pieces: a post-bed platform is not the comfortable choice on flat fabric.
The WiFi module for production monitoring needs a Jack gateway bought separately, one per 50 machines. source
Low-bobbin thread detection is an option, not standard. source

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