13 Best Overlocker Thread (2026 Review)

Finding the right thread for your overlocker can be the difference between a professional, durable finish and a frustrating mess of snapped fibers and skipped stitches. Many sewers struggle with thread that shreds under the high speed of a serger, lacks the necessary elasticity, or simply runs out too quickly in the middle of a large project.

You want a thread that is strong, smooth, and cost-effective, providing a clean stitch on everything from delicate chiffon to heavy denim. After researching the top options on the market, the best overall choice for reliability and value is the AK Trading 4-Pack White All Purpose Sewing Thread Cones.

Best Overlocker Thread of 2026

When selecting the right thread for your overlocking projects, understanding the technical aspects of fibre content and weight is essential for achieving professional finishes. For a comprehensive overview of what overlocker thread is and how it functions within different machine systems, you can refer to the detailed explanation on Wikipedia’s page on overlock stitches. To help you navigate the specific brands that perform best in these machines, our guide to the top thread brands for sewing machines provides valuable insights into tensile strength and quality.

1. AK Trading 4-Pack White Cones – Best Overall Value

Why it stands out

This AK Trading pack offers an impressive 6,000 yards per cone, providing a massive amount of high-tensile polyester thread that glides smoothly through serger loops without fraying.

Key points

• High-tensile strength for heavy-duty use
• 6000 yards per cone (24,000 total yards)
• Compatible with serger, overlock, and merrow machines
• Made from durable spun polyester

Pros

• Excellent value for the total yardage
• Consistent tension and smooth finish
• Ideal for high-volume sewing projects
• Resists breaking at high serger speeds
• Professional-grade quality

Cons

• Only available in white for this specific pack
• Cones may be too large for very small domestic sewing machines

Best for

Sewing enthusiasts and professionals who need a reliable, bulk supply of white thread for overlocking and quilting.

2. New brothread 4 Large Cones – Premium Spun Polyester

Why it stands out

New brothread is a leader in the embroidery and serger space, offering a 40S/2 (Tex27) weight thread that is specifically engineered to reduce lint and prevent thread nests.

Key points

• 5500 yards (5000m) per cone
• 30 color options available
• 40S/2 industry standard weight
• Excellent for quilting and piecing

Pros

• Very low lint production
• Strong color fastness
• Works perfectly on overlock and serger machines
• High tensile strength
• Wide variety of color packs

Cons

• Slightly more expensive than generic brands
• Some users may prefer a smaller spool for storage

Best for

Quilters and garment makers looking for a high-quality, low-lint thread in specific colors.

3. AK Trading 4-Pack Black Cones – Best for Dark Fabrics

Why it stands out

Similar to the white version, this black 4-pack provides 6,000 yards per cone, ensuring you can tackle large batches of dark garments without constantly changing threads.

Key points

• 24,000 total yards of black thread
• High-tensile polyester construction
• Suitable for hand embroidery and sergers
• Consistent dye lot for color matching

Pros

• Deep, rich black color
• Highly durable for heavy fabrics
• Great for merrow and overlock edges
• Excellent bulk pricing
• Minimal stretching or shrinking

Cons

• Limited to the color black
• May require re-threading on very old machines

Best for

Tailors and sewers who primarily work with dark materials like suits, costumes, or heavy drapery.

4. Black & White Sewing Thread 8PCS – Best Starter Pack

Why it stands out

This 8-piece set provides a balanced mix of black and white cones, making it the perfect “grab and go” option for beginners who need to cover the basics immediately.

Key points

• 3000 yards per spool
• 40S/2 standard weight
• 8 cones total (4 Black, 4 White)
• All-purpose polyester

Pros

• Affordable entry-level price
• Enough cones to set up multiple machines
• Strong and tangle-free
• Good for both sewing and overlocking
• Compact packaging

Cons

• Less yardage than jumbo cones
• Only basic colors included

Best for

Beginners or casual sewers who need a standard supply of the two most essential thread colors.

5. Tortoise 4 Cones White Thread – Best for Budget Serging

Why it stands out

Tortoise delivers a reliable 100% polyester thread that performs well under the high tension of overlock machines while remaining very budget-friendly.

Key points

• 3000 yards per cone
• 100% Spun Polyester
• 40S/2 Weight
• Designed for all-purpose use

Pros

• Very affordable price point
• Smooth feeding through serger eyes
• Decent tensile strength
• Good for practicing serger techniques
• Clean white finish

Cons

• May produce more lint than premium brands
• Smaller total yardage than AK Trading

Best for

Hobbyists who want a low-cost thread for everyday serging and crafting.

6. Mandala Crafts 4 Pack – Best for High Volume

Why it stands out

With a massive 24,000 yards in the pack, Mandala Crafts focuses on providing a consistent, commercial-grade white thread that holds up to industrial-level use.

Key points

• 40S/2 construction
• 24,000 total yards
• Strong polyester core
• Ideal for overlock and quilting

Pros

• Excellent for long-term projects
• Highly resistant to tangling
• Smooth finish on delicate fabrics
• Great value for the yardage
• Reliable brand reputation

Cons

• Only available in white
• Cones are quite tall

Best for

Small business owners or avid sewers who use their overlocker daily.

7. Serger Thread 4 Grey Cones – Best for Garment Construction

Why it stands out

This set offers a neutral grey color that is incredibly versatile for “invisible” serging on medium-tone fabrics where white or black would be too noticeable.

Key points

• 12,000 total yards (4 x 3000)
• 40S/2 Polyester
• Neutral grey tone
• Suitable for handcrafts and quilting

Pros

• Versatile color for many fabrics
• Strong and durable stitch
• Works well on overlock machines
• Good tension control
• Affordable 4-pack

Cons

• Color is limited to grey
• May not match specific designer fabrics

Best for

Sewers looking for a “workhorse” neutral thread for general garment assembly.

8. AOFITOA 14 Pack Assorted Colors – Best for Variety

Why it stands out

This 14-pack provides a rainbow of 40S/2 thread, allowing you to perfectly match your overlock stitches to almost any fabric color in your stash.

Key points

• 14 assorted colors
• 1600 yards per cone
• 40S/2 Overlock thread
• Great for piecing and merrow

Pros

• Huge variety of colors
• Includes brights, pastels, and neutrals
• Good for decorative overlocking
• Compact cone size
• Excellent for color-coded projects

Cons

• Lower yardage per cone than other brands
• May not be enough for very large quilts

Best for

Creative sewers who want their overlock stitches to match or complement their fabric patterns.

9. BBTO 6 Rolls Polyester Cones – Best Multi-Color Pack

Why it stands out

BBTO offers a practical set of 6 essential shades—including beige, grey, and coffee—that cover the most common clothing and home decor colors.

Key points

• 3000 yards per roll
• 6 neutral and basic colors
• All-purpose polyester
• Great for overlock and quilting

Pros

• Covers most common sewing needs
• Strong and reliable polyester
• Good price for a 6-pack
• Easy to thread on most sergers
• Sturdy cone construction

Cons

• Does not include bright or pastel colors
• Yardage is mid-range

Best for

Home decor sewers and those who work primarily with earth tones and neutrals.

10. Serger Thread 4 Red Cones – Best for Bold Finishes

Why it stands out

If you specialize in lingerie, dancewear, or want to add a pop of color to your seams, this 4-pack of vibrant red thread provides a consistent, fade-resistant finish.

Key points

• 12,000 total yards
• Bright, vivid red color
• 40S/2 All-purpose polyester
• Ideal for sergers and overlock machines

Pros

• High-visibility color
• Strong and smooth
• Great for decorative edges
• Good value for a 4-pack
• Color stays bright after washing

Cons

• Only available in red
• May bleed on the first wash (pre-washing recommended)

Best for

Sewers who need a dedicated, high-quality red thread for specific projects or brand aesthetics.

11. Simthread 4 Big Cones – Best for Quilting

Why it stands out

Simthread is known for its “Natural” (off-white) shade which is a favorite among quilters who prefer a softer look than bright white, plus it offers a massive 5500 yards per cone.

Key points

• 100% Spun Polyester
• 5000m (5500 yards) per cone
• 40S/2 weight
• Designed for overlock and merrow

Pros

• Excellent for quilting cotton
• Very smooth and low-lint
• High-quality spun polyester
• Large capacity cones
• Beautiful natural off-white color

Cons

• Not a “bright” white
• Can be pricier than store brands

Best for

Quilters and sewers looking for a premium, off-white finish for their projects.

12. ilauke 12 x 1800 Yards – Best Assorted Color Value

Why it stands out

This ilauke set is one of the most comprehensive color packs available, offering 12 different shades at an incredibly low price per yard.

Key points

• 12 assorted colors
• 1800 yards per cone
• All-purpose polyester
• Suitable for overlock and piecing

Pros

• Extensive color selection
• Very budget-friendly
• Great for small craft projects
• Easy to store due to smaller cone size
• Good for learning color theory in sewing

Cons

• Lower yardage requires more frequent changes
• Quality may vary slightly between colors

Best for

Crafters and beginners who want to experiment with different thread colors without a large investment.

13. White Serger Thread 4 Cones – Best Basic White

Why it stands out

This is a straightforward, no-nonsense 4-pack of white serger thread that delivers exactly what is needed for standard overlocking at a very accessible price point.

Key points

• 3000 yards per spool
• All-purpose polyester
• Designed for standard sewing machines
• Clean, bright white color

Pros

• Simple and effective
• Good for everyday mending
• Reliable performance
• Easy to find and order
• Works on most serger brands

Cons

• Standard yardage (not jumbo)
• Basic packaging

Best for

Anyone who needs a quick, reliable restock of basic white overlocker thread.

How to Choose the Best Overlocker Thread

Choosing the right thread for your overlocker (serger) is more technical than choosing thread for a standard sewing machine. Because sergers use loopers that move at extremely high speeds, the thread must have high tensile strength and a smooth finish to prevent shredding. The first thing to look for is the material; 100% spun polyester is the gold standard. It combines the strength of polyester with the soft, matte finish of cotton, making it ideal for almost all types of fabric. Avoid using old, leftover cotton thread, as it tends to break under the tension of a serger.

Next, consider the weight. The industry standard for overlockers is 40S/2 (also known as Tex 27). This weight is thick enough to provide a durable seam but thin enough to allow for 2, 3, or 4-thread overlocking without creating bulky seams. If you are working with very lightweight chiffon or heavy denim, you might need to adjust the weight, but for 90% of projects, 40S/2 is the perfect fit.

Finally, think about yardage and cone shape. Sergers consume thread much faster than regular machines. Buying “cones” rather than small spools is essential for efficiency. Look for cones with at least 3,000 yards. The shape of the cone is also important; it should have a gradual taper so the thread feeds evenly without slipping off the bottom or getting caught at the top. Investing in a thread stand can also help if your serger doesn’t have built-in upright cone holders.

Mistakes to Avoid When Buying Overlocker Thread

One of the most common mistakes sewers make is buying cheap, low-quality thread to “save money.” In the long run, this is a false economy. Cheap thread often has inconsistent thickness and produces excessive lint. This lint builds up inside your serger’s loopers and tension discs, leading to mechanical issues and costly repairs. Furthermore, cheap thread is more likely to snap while you are serging, which can be incredibly frustrating and time-consuming to fix, especially if you have to re-thread all four loopers.

Another mistake is using standard “sewing machine spools” on a serger. While it is possible with a spool cap, it is not efficient. Spools are designed to feed thread horizontally, whereas sergers are designed to pull from vertical cones. Using a spool can cause the thread to twist or the spool to bounce, leading to uneven tension. Always opt for “serger cones” or “industrial cones” which are designed to feed smoothly at high speeds.

Lastly, don’t ignore the color match. While many people use white or black for everything, a visible overlock stitch on a sheer or lightweight fabric can ruin the look of a garment. It is worth investing in a multi-pack of assorted colors or specific shades that match your favorite fabrics. Also, avoid mixing different types of thread (e.g., polyester in the needle and cotton in the looper) as they have different stretch and shrinkage properties, which can cause the seam to pucker over time.

FAQ – Overlocker Thread

• Can I use regular sewing thread in my overlocker? Yes, but it is not recommended for large projects. Regular spools run out quickly, and the thread may not be strong enough for the high-speed looping of a serger.
• What does 40S/2 mean? It refers to the thickness of the thread. 40S is the size, and /2 means it is a 2-ply thread. This is the standard weight for most garment sewing and overlocking.
• Why is my serger thread shredding? This is usually caused by old thread, low-quality thread, or a burr on your machine’s tension disc or needle plate. Try using a high-quality spun polyester thread.
• How much thread does a serger use? Sergers use significantly more thread than sewing machines—up to 5 times more. This is why buying large cones (3000+ yards) is essential.
• Should I use the same thread in the needle and the looper? Generally, yes. Using the same type and weight of thread ensures even tension and consistent stitch formation.
• What is the best color for overlocker thread? White and black are the most versatile. However, using a “natural” or “beige” thread is often better for light-colored garments as it is less visible than bright white.
• Can I use overlocker thread for regular sewing? Absolutely. 40S/2 overlocker thread is perfect for regular sewing machines, quilting, and hand sewing as well.
• What is the difference between spun and core polyester? Spun polyester has a soft, cotton-like feel, while core polyester is stronger and shinier. Spun is usually preferred for overlocking as it blends better with fabric.
• Do I need a thread stand for my serger? If you use very large cones that don’t fit on your machine’s pegs, a thread stand helps ensure the thread feeds smoothly without tangling.
• How do I store my serger thread? Keep thread in a cool, dry place away from direct sunlight to prevent fading and weakening of the fibers.

Conclusion

Selecting the best overlocker thread is a crucial step in achieving professional-quality results in your sewing projects. While it might be tempting to use whatever thread you have on hand, investing in high-quality, 40S/2 spun polyester cones will save you time, frustration, and money in the long run. Throughout our research, the AK Trading 4-Pack White Cones stood out as the best overall choice due to their incredible 6,000-yard capacity and high-tensile strength, making them a favorite for both hobbyists and professionals.

For those who need more color variety, the New brothread and AOFITOA assorted packs offer excellent value and performance across a wide spectrum of shades. Remember that the key to a great serger experience lies in the balance of quality, weight, and appropriate yardage. By choosing one of the top-rated threads reviewed above, you can ensure that your seams are not only beautiful but also durable enough to withstand years of wear and washing. Happy serging!

Choosing the correct thread can be confusing because the terminology often varies depending on where you live or which machine you own. We clarify the confusion in our article discussing overlock thread versus serger thread to ensure you purchase the correct cones for your specific model. This resource is helpful because it breaks down the subtle differences in sizing and application, ensuring your seams remain durable without unnecessary bulk.