Janome MyLock 634D Serger Review In Details

TheJanome MyLock 634D Overlock Serger is indeed a feature-rich and advanced serger, offering a range of capabilities to enhance the sewing experience.

About Janome

Janome is a well-known brand in the world of sewing machines and related equipment. The company, Janome Sewing Machine Co., Ltd., is a Japanese manufacturer that has been producing sewing machines for more than 100 years. Janome is recognized for its commitment to innovation, quality craftsmanship, and user-friendly designs, making it a popular choice among both beginners and experienced sewers.

The Janome sewing machines are known for their durability, versatility, and a wide range of features that cater to various sewing needs. These machines often include functions such as different stitch patterns, automatic threading, adjustable speed control, and easy-to-use controls, providing users with the tools they need to create a variety of projects.

In addition to traditional sewing machines, Janome also offers sergers or overlock machines. A serger, also known as an overlocker, is a specialized sewing machine that trims excess seam allowances and overcasts raw edges to prevent fraying. Sergers are particularly useful for creating professionally finished seams in garments, as they can simultaneously cut, stitch, and finish the edges of fabric.

Janome sergers are designed to deliver precise and efficient results, enhancing the overall sewing experience. These machines often feature multiple threads and differential feed mechanisms to handle various fabrics and produce neat and durable seams. Janome sergers are appreciated for their reliability, ease of use, and the ability to achieve professional-quality finishes on a wide range of sewing projects.

You may also want to check out our Best Sewing Machine Reviews – we have just updated it for 2024

You may also want to check out our Best Serger Machine Reviews – we have just updated it for 2024Janome MyLock 634D

Below you will find the Janome MyLock 634D Overlock Serger hand-picked by us to highlight both the good and bad points

Review of: Janome MyLock 634D Overlock Serger


Our Overall Rating: 4.8 out of 5

Why is it Better?

  • 2, 3, or 4 thread serger.
  • Lay-in thread tension dial.
  • Threading chart for easy setup.
  • Color-coded thread guides for quick identification.
  • Tension release device for smooth threading.
  • Easily accessible lower looper guides.
  • Changeable thread guide for versatility.
  • Quick change rolled hem feature.
  • Lower looper pretension setting slider.
  • Easily retractable upper knife.
  • Adjustable foot pressure for various fabrics.
  • Snap-on presser feet for quick changes.
  • Adjustable stitch length (1mm to 5mm).
  • Differential feed ratio (0.5 to 2.25).
  • Adjustable cutting width (3.1mm to 7.3mm).
  • Maximum speed of 1,300 spm.
  • Waste chip box for convenient cleanup.
  • Heavy metal frame ensures stability.
  • 5-year limited warranty for peace of mind.
  • Weighs 20 pounds for portability.
  • Compact product dimensions: 13″D x 16″W x 15″H

If you are considering  purchasing this excellent Janome MyLock 634D Overlock Serger, we have also included our standard diagram of ratings and lists of pros-cons



  • Versatility in Stitching Options: The Janome MyLock 634D offers 2, 3, or 4 thread overlock stitching, providing users with a wide range of stitching options for different fabrics and projects.

  • User-Friendly Threading System: With features like color-coded thread guides, lay-in thread tension dial, and an easily accessible lower looper threading system, the serger simplifies the threading process, making it more user-friendly.

  • Quick Change Rolled Hem Feature: The ability to switch between standard serging and rolled hemming without changing the needle plate enhances efficiency and saves time during sewing projects.

  • Adjustable Settings for Precise Stitching: Adjustable stitch length (1mm to 5mm), cutting width (3.1mm to 7.3mm), and differential feed ratio (0.5 to 2.25) provide users with precise control over their stitching, catering to different fabrics and project requirements.

  • Heavy Metal Frame for Stability: The heavy metal frame contributes to the stability of the serger, ensuring steady operation and durability over time.

  • Maximum Speed of 1,300 SPM: The serger’s high maximum stitching speed of 1,300 stitches per minute enables users to complete sewing projects efficiently.

  • 5-Year Limited Warranty: The inclusion of a 5-year limited warranty provides users with long-term confidence in the durability and performance of the Janome MyLock 634D.


  • Learning Curve for Beginners: Due to its advanced features, beginners may experience a learning curve in fully understanding and utilizing all the capabilities of the Janome MyLock 634D.

  • Higher Price Point: Compared to basic sergers, the Janome MyLock 634D’s advanced features come with a higher price point, which may be a consideration for budget-conscious users.

The Janome MyLock 634D Overlock Serger is a powerhouse of features designed to elevate your sewing experience. From versatile stitching options to user-friendly adjustments, this serger caters to both beginners and seasoned sewers. Let’s explore the extensive list of features that make the Janome MyLock 634D a go-to choice for those seeking precision, efficiency, and professional results.

2, 3, or 4 Thread Serger

The Janome MyLock 634D offers unparalleled stitching versatility with options for 2, 3, or 4 thread overlock stitching. This flexibility allows you to choose the perfect configuration for your fabric and project needs, ensuring a wide range of creative possibilities.

Lay-In Thread Tension Dial

Adjusting thread tension is a breeze with the lay-in thread tension dial. This feature empowers you to fine-tune your stitches for optimal results, providing the control needed to achieve professional-quality finishes on various fabrics.

Threading Chart

The serger includes a threading chart, a visual guide that simplifies the threading process. This aids users in threading the machine correctly, minimizing setup time and reducing the likelihood of errors.

Color-Coded Thread Guides

Threading becomes a straightforward task with color-coded thread guides. These guides eliminate confusion by using distinct colors for different threads, making it easy to follow and ensuring accurate threading every time.

Tension Release Device

Enhancing the user experience, the tension release device allows for the smooth release of tension when needed. This feature proves invaluable during threading and stitch adjustments, contributing to a seamless sewing process.

Easily Accessible Lower Looper Guides

The Janome MyLock 634D features easily accessible lower looper guides, streamlining the threading process. These guides are conveniently positioned, making it simple to navigate through the threading steps and ensuring efficient serger setup.

Changeable Thread Guide

Adding to its versatility, the serger incorporates a changeable thread guide. This feature provides adaptability in thread routing, accommodating different stitch configurations and expanding your creative possibilities.

Quick Change Rolled Hem

Switching between standard serging and rolled hemming is effortless with the quick change rolled hem feature. What sets this apart is the ability to make this transition without the need to change the needle plate, saving time and effort during your sewing projects.

Lower Looper Pretension Setting Slider

Fine-tune the lower looper’s pretension with the setting slider, allowing for precise adjustments. This level of control ensures optimal stitch quality, especially when working with various fabric types that may require specific tension settings.

Easily Retractable Upper Knife

The easily retractable upper knife is a user-friendly feature that prevents the cutting of fabrics when not needed. This adds a layer of convenience and safety, giving you control over when the upper knife engages during the serging process.

Adjustable Foot Pressure

Tailor the pressure applied by the presser foot to accommodate different fabric thicknesses. This adjustable foot pressure feature is particularly useful when working with a variety of materials, ensuring consistent and professional results.

Snap-On Presser Feet

Efficiency is key, and the Janome MyLock 634D delivers with snap-on presser feet. Changing presser feet is quick and hassle-free, allowing you to seamlessly transition between different sewing techniques without interruptions.

Adjustable Stitch Length (1mm to 5mm)

Precision is paramount in sewing, and the serger’s adjustable stitch length (ranging from 1mm to 5mm) provides the control needed for various applications. Whether you’re working on delicate fabrics or sturdy materials, this feature ensures your stitches meet your exact specifications.

Differential Feed Ratio (0.5 to 2.25)

Achieve perfect seams on a variety of fabrics with the adjustable differential feed ratio (ranging from 0.5 to 2.25). This feature prevents stretching or puckering, ensuring your serging is flawless, regardless of the material you’re working with.

Adjustable Cutting Width (3.1mm to 7.3mm)

Tailor the width of your fabric cut with the adjustable cutting width feature (ranging from 3.1mm to 7.3mm). This level of customization allows you to adapt your serging to different project requirements, adding to the machine’s versatility.

Maximum Speed of 1,300 SPM (Stitches Per Minute)

Boost your efficiency with a maximum stitching speed of 1,300 stitches per minute. The Janome MyLock 634D is built to handle your sewing projects swiftly and accurately, ensuring timely completion without compromising on quality.

Waste Chip Box

Keeping your workspace clean is made easy with the waste chip box. This thoughtful addition collects fabric trimmings and waste, providing a tidy and organized environment for you to focus on your creative endeavors.

Heavy Metal Frame

Stability is a hallmark of the Janome MyLock 634D, thanks to its heavy metal frame. This robust construction not only ensures durability but also contributes to the machine’s smooth and steady operation.

5-Year Limited Warranty

For added peace of mind, the Janome MyLock 634D comes with a 5-year limited warranty. This extensive coverage speaks to the confidence Janome has in the durability and performance of their serger, assuring users of long-lasting reliability.

Weighs 20 Pounds

Portability meets power with the Janome MyLock 634D, weighing in at 20 pounds. This balance makes it easy to transport and store the serger while maintaining the stability needed for precise and consistent stitching.

Compact Product Dimensions: 13″D x 16″W x 15″H

Despite its powerful features, the Janome MyLock 634D maintains a compact footprint, measuring 13 inches in depth, 16 inches in width, and 15 inches in height. This thoughtful design ensures that the serger can seamlessly fit into your workspace without compromising on functionality.

Standard Accessories

  • Upper Knife (1)
  • Needle Threader
  • Set of Needles
  • Standard Serger Foot
  • Thread Stripping Discs
  • Needle Plate (standard)
  • Spool Nets (4)
  • Spool Caps (4)
  • Spool Holders (4)
  • Spreader
  • Tweezers
  • Lint Brush
  • Screwdriver (L, S)
  • Spanner
  • Oil
  • Waste Chip Box



FeatureMyLock 634D1110DX ProAirThread 2000DCoverPro 1000CPX
Number of Threads2-3-or-4_thread_serger2-3-or-4 thread serger2-3-or-4 thread serger2-3-or-4 thread serger
Type of TensionManual_DialsManual DialsManual DialsManual Dials
Presser FootSnap-OnSnap-OnSnap-OnSnap-On
Cover Stitch CapabilityNoNoNoYes
ThreadingEasy Lay-in ThreadingEasy Lay-in ThreadingPattern Selection Dials with Stitch Information DisplayYes
Threading ChartYesYesYesYes
Color Coded Thread GuidesYesYesYesNo
Tension Release LeverYesYesNoYes
Easily Accessible Lower Looper GuidesYesYesNoYes
Changeable Thread GuideYesYesNoNo
Quick Change Rolled HemYesYesYesNo
Lower Looper Pretension Setting SliderYesYesNoYes
Cover Stitch Changeover DeviceNoNoNoNo
Easily Retractable Upper KnifeYesYesYesNo
Adjustable Foot PressureYesYesYesNo
Built in Two Thread ConverterNoNoNoNo
Flip Needle SystemNoYesNoNo
Stitch Length Adjustment1.0mm to 5.0mm1.0mm to 5.0mm1.0mm to 5.0mm1.0mm to 4.0mm
Differential Feed Adjustment0.5mm to 2.25mm0.5mm to 2.5mm0.5mm to 2.0mm0.5mm to 2.25mm
Cutting Width Adjustment3.1mm to 7.3mm3.1mm to 7.3mm5.5mm to 7.5mm (Left Needle), 3.3-5.3mm (Not using left needle)Not Available
Maximum Speed1,300 SPM1,300 SPM1,300 SPM1,000 SPM
Machine Weight16.6 lbs16.8 lbs17.4 Pounds19 lbs
Dual Voltage 80v – 240vNoNoNoNo
CoverDust CoverDust CoverDust CoverDust Cover


How user-friendly is the threading process on the Janome MyLock 634D?

Answer: Threading the Janome MyLock 634D is remarkably user-friendly, featuring easy lay-in threading, color-coded thread guides, and a threading chart, ensuring a smooth and hassle-free setup for users.

What stitching options does the Janome MyLock 634D provide?

Answer: The Janome MyLock 634D offers a variety of stitching options with 2, 3, or 4 thread overlock stitching, providing users the flexibility to choose the right configuration for different fabrics and project requirements.

Can the Janome MyLock 634D perform rolled hemming?

Answer: Yes, the Janome MyLock 634D excels in rolled hemming with its quick change rolled hem feature, allowing users to swiftly switch between standard serging and rolled hemming without the need to change the needle plate.

How does the Janome MyLock 634D handle different fabric types?

Answer: The Janome MyLock 634D is equipped with adjustable settings such as differential feed ratio (0.5 to 2.25), adjustable cutting width (3.1mm to 7.3mm), and adjustable foot pressure, ensuring precise control and optimal results when working with various fabrics.

What is the maximum speed of the Janome MyLock 634D?

Answer: The Janome MyLock 634D operates at a maximum speed of 1,300 stitches per minute, allowing users to complete sewing projects efficiently and in a timely manner.

Is the Janome MyLock 634D suitable for both beginners and experienced sewers?

Answer: Absolutely, the Janome MyLock 634D caters to a broad range of users, from beginners to experienced sewers, with its user-friendly features, versatile stitching options, and precision controls that enhance the overall sewing experience.

How does the Janome MyLock 634D ensure stability during operation?

Answer: The Janome MyLock 634D is constructed with a heavy metal frame, providing stability and durability. This robust design ensures a steady and smooth operation, contributing to the machine’s overall reliability.

Can the Janome MyLock 634D handle professional-quality finishes?

Answer: Yes, the Janome MyLock 634D is designed to deliver professional-quality finishes with features such as adjustable stitch length, tension controls, and the ability to work with different threads and fabrics.


In conclusion, the Janome MyLock 634D Serger stands as a powerhouse in the realm of sewing machines, offering a comprehensive set of features that caters to the needs of both beginners and seasoned sewers alike. Renowned for its exceptional versatility, this serger excels in providing 2, 3, or 4 thread overlock stitching, allowing users to tackle a diverse array of sewing projects with ease.

One of the standout features of the MyLock 634D is its user-friendly design, making the threading process a breeze with easy lay-in threading, color-coded thread guides, and a helpful threading chart. This thoughtful design ensures a smooth setup, minimizing the learning curve for users and allowing them to focus on their creative endeavors.

The serger’s ability to perform quick change rolled hemming adds another layer of convenience, allowing users to seamlessly transition between standard serging and rolled hemming without the need for a needle plate change. This feature, combined with adjustable settings for stitch length, cutting width, and foot pressure, empowers users to achieve precise and professional results across various fabric types.
The robust construction of the MyLock 634D, featuring a heavy metal frame, ensures stability during operation, contributing to its durability and reliability. With a maximum speed of 1,300 stitches per minute, this serger allows for efficient and timely completion of sewing projects without compromising on quality.

Furthermore, the inclusion of a 5-year limited warranty underscores Janome’s confidence in the durability and performance of the MyLock 634D, providing users with long-term assurance and peace of mind.

In essence, the Janome MyLock 634D Serger stands as a versatile, reliable, and user-friendly sewing companion, empowering users to unleash their creativity and achieve professional-quality finishes in their sewing projects.

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