Juki MO-644D Overlocker Review

JUKI MO644D Portable Serge

We sewing enthusiasts are only a little too excited to have an industrial brand like Juki introduce an overlocker series designed specifically to be used at home. Called the Juki Pearl Line Overlockers, this series is a project of the Juki Home Sewing group, and features “advanced overlock technology that is perfect for clothing, home decoration, and crafts”. The variety of overlockers have built-in roll hemming, differential feed, and offer quite a varied palette of overlock techniques and stitches. They have quickly become a favorite among beginners and advanced sewers, alike. In this Juki serger review, we focus on the Juki MO-644D.


Think precision, speed, and versatility in an overlocker, and you’ve captured the essence of Juki MO-644D. Juki has described it as a “2-Needle, 3/4-thread overlock machine with differential feed and automatic rolled hemming”. You can use this overlocker to create a wide range of outfits from comfortable wear, sportswear to more elegantly tailored pieces. 

It’s easy and encouraging for beginners while offering the multiple functions, technique adaptability, and the near-numerical precision required by an advanced sewer. Let’s look at its main features.

1- Efficient Cutting System

The MO-644D operates with two knives, placed above and below, to ensure perfectly trimmed, smooth edges for all fabric types. No frays or strays guaranteed.

2- Adjustments

This machine allows its user sufficient control of the outcome with its adjustment-dials.

  • Width cutting adjustment – for setting the desired seam allowance width.
  • Thread tension adjustment – for setting thread tension as per each individual fabric requirement 
  • Stitch length adjustment – allows various stitching techniques while also accommodating a wide range of specialty, decorative threads.

3- Color-Coded Threading

The MO-644D has color-coded thread paths that are clearly marked, and easy and instantaneous to follow.

4- Stitch Variations

The more threads an overlocker can accommodate, the more stitch variety it can create. Since this is a 4-thread overlocker, it caters to 7 stitch variations including flatlock, overlock, overcast, and rolled hem styles. In addition, its 4-thread system allows for a stronger and wider seam.

5- Differential Feed

The MO-644D offers many options with reference to its differential feed feature. With feed adjustment, one can create tidy seams on a variety of fabrics ranging from thick wool and knitwear to the tricky and stretchy jerseys, stiff cotton, or thin, flimsy chiffons. It also allows a variety of frills, ruffles, and gathers, as well as the characteristic lettuce leaf edge with a rolled hem.

6- Automatic Rolled Hem

This is one of the most convenient features of this overlocker. Just flip its switch, adjust the thread tension dial and sew away a really quick, uniform rolled hem. 

7- Set of 6-presser feet 

This overlocker’s set of multi-purpose presser feet allow the application of various decorative items such as ribbons, tapes, elastics, braids, thin cords, sequins and bead/pearl laces, etc. All you have to do is replace the multi-purpose foot with the required Juki specialty foot and you’re ready to sew in ruffles and or add fancy embellishments. 


  • Weight: 7 kg (15 lbs)
  • Uses size 11 or 14 machine needles
  • Dimensions: 10.6” (width) x 13.5” (height) x 11.5”(length)
  • Upto 1500 stitches per minute 
  • Number of threads per stitch:  2/3/4


  • Spool caps
  • Bright light
  • Screwdriver
  • Standard presser foot
  • Vinyl cover
  • Oiler
  • Thread nets
  • Tweezer
  • Needle pack
  • Brush and Needle Inserter
  • Light bulb
  • Accessory pouch
  • Looper threader
  • Power cord
  • Foot control
  • BONUS – Instructional DVD

Pros & Cons from the Users


  • Near-quiet noise levels
  • Up to 1500 stitches per minute (overlockers generally offer 1300 spm)
  • Smooth runner
  • Comes with a long cord
  • The suction cup on the bottom prevents accidental falls.
  • The owner’s manual is quite detailed including methods with pictures
  • Allows “breeze-through” sewing
  • Portable
  • Rated highly by beginners 
  • Professionals have compared to an industrial overlocker


  • Doesn’t have the Micro safety switch we see in Juki MO-655
  • Issues with thread – breaks a lot
  • Bonus instructional DVD was not very helpful

A Quick Overview

So what do the MO-644D features mean for us sewers?

Juki MO-644D offers near-indefinite design opportunities, all of which can be accomplished in just a couple of swift motions. You can have incredibly fancy designs with intricately sewn-on decorative elements such as ribbons, braids, pearl/bead laces, elastics, and even thin cords. Its differential feed allows you to sew heavy duty fabric curtains, fine silk blouses, or lightweight tulle veils.

One of the best features of this overlocker is how effortlessly it allows you to make ruffles, frills, and gathers without having to create them prior to the sewing process. Just put the cloth in place, set the thread tension and differential feed according to how tight you want your ruffles, and sew away! The overlocker ruffles and gathers the cloth itself, and in a matter of seconds, you have the perfect, evenly sewn ruffle! What’s even better is that since the machine can accommodate the thick fabrics and layers, you can instantly sew up multiple layers of ruffles in one go. 

With this overlocker, you can finally complete those satin pillowcases you’ve been putting off, with quick frills along their edges; add a speedy rolled hem to the thick woolen cloth you’ve been meaning to use as a winter blanket; simply upcycle an old sweater, or instantly fancy up your little girl’s plain dresses with multiple, colorful ruffles. 

We think this easy, breezy, quick, and quiet overlocker will prove to be a long-term investment in your sewing room. So go ahead, make the purchase, and spread the love and joy brought on by your home-sewn things!  

If this model doesn’t impress you, check out our 10 Best Overlockers for more options.