Janome Mylock 644d vs 744d Sewing Machines: Which is Best?

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Are you on the lookout for a new overlocker sewing machine? If so, you may be wondering which one is best: the Janome 644d or the Janome 744d?

The truth is, there’s no such thing as the best; only what’s right for your particular needs.

Both of these machines sit mid-range in Janome’s lineup of overlockers and offer great features and reliability.

There are, however, some important things to keep in mind when choosing between the two.

In this article, we break down the key differences between these models to help you make the best choice for your needs.

Janome 644d

A popular and capable machine with all the essentials.

Janome 744d

An advanced overlocker sewing machine with a free arm.

Janome MyLock 644D

The MyLock 644D overlocker combines essential features for simple overlocking with a handy needle threader, thread cutter and differential feed system of two feed dogs.

The MyLock 644D offers a variety of features designed to make it the easiest overlock machine to use. For example, the rolled hem converter eliminates the need to change the needle plate, foot, or tension setting when hemming.

Janome has made the lower looper guides easier to access, with colour-coded guides that are simple to follow if you want to overlock with two, three, or four threads.

Janome MyLock 744D

The MyLock 744D is an advanced overlocker with 2 needles and 2, 3 or 4 thread overlock stitching. It features a differential feed ratio that is adjustable from 0.5 to 2.25 and exceptional control for handling all types of fabrics and for creating special effects.

With colour-coded thread guides and a self-threading lower looper, it’s very easy to thread the Janome 744D. Just flip the switch and the lower looper is threaded. The guide is automatically returned to its normal position when you turn the balance wheel.

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Key Differences

Free arm

The main difference between the Janome 644D and 744D is that the 744D has a free-arm.

A free arm sewing machine is one where the bed of the sewing machine can be raised so that it’s not connected to the base of the machine.

The free arm is used when sewing fabric is round, so a tube of fabric, like a sleeve, can be slid over the free arm.

It makes it easier to guide the fabric under the needle, and allows you to sew without catching other parts of your garment.

Keep in mind that a free-arm is not critical. Anything that you can sew with a free arm can also be sewn with a flatbed sewing machine.

Ease of Use

Many users friend the more simple design of the 644D makes it easier to use. This is the main reason it has become one of the most popular machines on the market.


The Janome MyLock 644D is the more affordable overlocker. It has an RRP of $799.00 while the MyLock 744D has an RRP of $899.00.

644D vs 744D: Which to Buy?

As you can see, there really aren’t many major differences between these two machines.

Here are the things they have in common:

  • Sewing speed of 1,300 SPM
  • 2, 3, or 4 thread overlocking
  • Easy threading lower looper
  • Weight of 8kg

In our view, unless you really want the free arm featured on the 744D, the 644D is the way to go.

Not only is it more affordable, but it has proven itself to be one of the most easy-to-use and reliable machines on the market.

You don’t need to look far to read reports of thousands of happy 644D users.

Janome 644d

A popular and capable machine with all the essentials.

Janome 744d

An advanced overlocker sewing machine with a free arm.

This article was written by Julia Warren

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