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Janome MyLock 644D Overlocker
Enjoy effortless overlocking & perfect finishes with the Janome MyLock 644D
The Janome MyLock 644D Overlocker is a versatile and reliable sewing companion, perfect for sewists of all skill levels. With 2/3/4-thread capabilities, adjustable settings, and an array of user-friendly features like a colour-coded threading system, built-in rolled hem, and bright LED lighting, this machine delivers professional-quality finishes with ease. Whether you're working on stretchy knits, delicate silks, or sturdy fabrics, the MyLock 644D ensures precision, speed, and creativity in every stitch.
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From delicate hems to durable seams—the Janome 644D delivers
2/3/4 thread stitch options
Achieve versatility with 2, 3, or 4-thread stitch options to suit a variety of fabrics and projects. From strong seams to decorative edges, this feature ensures your overlocking meets all creative and functional needs effortlessly.
Ready to sew
The machine is already full threaded so you can start sewing straight away! It includes 4 cones of white overlocker thread and no additional setup is required.
At-a-glance thread chart
The threading chart inside the front cover provides a visual guide for easy setup. Perfect for quick reference during threading.
Adjustable stitch length
Customise your stitching with an adjustable length ranging from 1.0mm to 5.0mm. Perfect for creating everything from dense, secure seams to long decorative stitches.
Adjustable seam & stitch width
Create seams with custom widths, offering flexibility to suit your project’s needs. Whether aiming for durable, functional seams or delicate, decorative finishes, adjustable stitch and seam width ensure a professional and tailored result every time.
Adjustable cutting width
Fine-tune your seam allowance with an adjustable cutting width ranging from 3.1mm to 7.3mm. This ensures clean, customised edges that meet your project’s unique requirements.
Easy threading lower looper
Thread the lower looper effortlessly with this easy-threading system. Designed for convenience, it reduces setup time so you can start sewing faster.
Built-in thread cutter
Trim threads effortlessly with the one-hand built-in thread cutter. This practical feature speeds up your workflow and allows you to easily create neat finishes.
Colour-coded threading system
Simplify your threading process with the intuitive colour-coded guides. Designed for 2, 3, or 4-thread overlocking, this user-friendly system ensures quick and accurate threading every time.
Snap-on presser feet
Switch presser feet quickly and easily with the snap-on system. This feature saves time and effort while allowing you to use specialised feet for different sewing tasks.
Adjustable differential feed
Perfect for all fabric types, the adjustable differential feed prevents puckering on lightweight materials and stretching on knits. The feed ratio can be adjusted from 0.5 to 2.25 for creative stitching effects or correcting fabric feeding issues. Achieve smooth, flawless seams every time, regardless of fabric elasticity or thickness.
Quick changeover to rolled hem
Create professional rolled hems with ease using the pre-tensioner slide. This feature eliminates the need to change the needle plate, foot, or tension settings, making it ideal for finishing lightweight fabrics quickly and efficiently.
Lay-in thread tension system
Enjoy precise tension control with the lay-in thread tension system. It guarantees consistent, balanced stitches, giving you professional results on every project.
Lower looper pre-tension setting slider
Achieve perfect tension with the pre-tension setting slider. This feature allows you to switch between standard stitching and rolled hemming to ensure flawless results.
Numbered tension dials
Easily adjust thread tension with numbered dials for precise settings. This feature simplifies operation and ensures optimal stitch quality.
Retractable upper knife
For projects where cutting isn’t required, the upper knife can be disengaged. Switch between cutting and non-cutting modes seamlessly as your project demands.
LED lighting
The Janome MyLock 644D Overlocker features bright, energy-efficient LED lighting that illuminates your sewing area. This provides clear visibility for detailed tasks, reducing eye strain and ensuring accurate stitching, even in low-light environments. The long-lasting LED light ensures consistent brightness throughout your sewing projects.
Built-in waste tray
Keep your workspace tidy with the built-in waste tray, which collects fabric trimmings and lint during sewing. Maintain a clean environment for efficient crafting.
Portable design
Weighing just 8kg, this overlocker is portable and easy to move with an integrated handle, making it ideal for workshops, classes, or home use.
Foot controller
The Janome MyLock 644D Overlocker comes with a responsive foot controller that allows precise control over sewing speed. This feature provides hands-free operation, enabling you to focus on fabric handling while adjusting your pace for ultimate precision and comfort.
Dust cover
Protect your machine from dust and debris with the included cover, keeping it in pristine condition.
Adjustable foot pressure
The Adjustable Foot Pressure mechanism allows users to customise the pressure applied by the presser foot to suit different fabric types and thicknesses. This feature is especially useful for handling delicate fabrics or heavy materials, ensuring smooth feeding and professional-quality stitches.
Maximum speed
Complete your projects efficiently with a maximum stitching speed of up to 1,300 stitches per minute. Ideal for large-scale or time-sensitive sewing tasks.
Safety switch
The safety switch prevents operation when the front cover is open, ensuring user safety at all times.
View detailed specifications →
Janome MyLock 644D 2/3/4 Thread Overlocker
What's in the box?
- Presser foot (on machine)
- Pack of needles (HAx1SP)
- Spool holders x 4
- Screwdriver (large)
- Screwdriver (small)
- Spool caps x 4
- Lint brush
- Tweezers
- Spanner
- Nets x 4
- Oil
- Spare upper knife
- Needle threader
- Spreader for 2 thread
- Lint catcher
- Accessory box
- Foot control
- Instruction book
| SKU | ML644D_Options |
| Brand | Janome |
| Number Of Threads | 4/3/2 |
| Max Number Of Threads | 4 |
| Differential Feed | 0.5mm to 2.25mm Ratio |
| Flatlocking | Yes |
| Rolled Hemming | Yes |
| Cover Hem | No |
| Top Cover Hemming | No |
| Chain Stitch | No |
| Adjustable Cutting Width | 3.1mm to 7.3mm |
| Adjustable Stitch Length | 1.0mm to 5.00mm |
| Retractable Upper Knife | Yes |
| Two Thread Converter | Yes |
| Waste Tray Included | Yes |
| Tension System | Lay-in |
| Air Threading (looper) | No |
| Quick Change To Rolled Hem | Yes |
| Mechanical Warranty | 1 Year |
| Computerised Warranty | 5 Year |
| Machine Weight | 8kg |
| Lighting Type | LED |
| Needle Threading | No |
| Foot Pressure Adjustment | Yes (Manual) |
| Foot Controller Included | Yes |
| Case Included | Yes (Soft) |
| Sewing Speed | 1300SPM |
| Free-arm | No |
| Products available | |
| ML644D | MyLock 644D Overlocker |
| ML644D_BundleA | MyLock 644D Overlocker with Bundle |
Janome warranty:
1 year on mechanical parts 5 years on electronic parts
Register your warranty here to ensure it is valid when a service/repair is required. For more information on the terms and conditions of your warranty, please visit Janome →
Janome leads in sewing innovation, offering reliable, user-friendly machines for sewing, quilting, and embroidery. With 100 years of expertise, they inspire creativity worldwide.
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