If you want professional results with your coverstitch sewing machine, using good quality thread and the correct size needle isn’t optional — it’s essential. The right materials make your stitches stronger, cleaner, and more durable. Whether you're finishing knit garments, hemming activewear, or crafting stretchy fabrics, your choice of thread and needles can make or break your final result.

Here’s why it matters — and our top recommendations for threads and needles that guarantee coverstitch success.

Why Thread Quality is Critical for Coverstitch Machines

Coverstitch machines create strong, stretchable seams — but only if you use a premium thread that can handle the movement and tension.
Using cheap or poor-quality threads often leads to:

• Snapped threads under minimal stretch

• Skipped stitches and inconsistent tension

• Fluffy lint buildup inside your machine

• Unprofessional, uneven stitching

Best Threads for Coverstitch Sewing:

✅ Madeira Aerolock
A strong, core-spun polyester thread made specifically for sergers and coverstitch machines. Madeira Aerolock ensures beautifully formed, durable stitches that can withstand frequent stretching and washing.

✅ Madeira Aeroflock - Looper
Looking for a softer, plush finish? Madeira Aeroflock is a textured polyester thread ideal for seams in knitwear, lingerie, and activewear. It adds elasticity and softness to your coverstitched hems and seams.

✅ Coats Astra - 120
Coats Astra is a smooth, consistent polyester thread built for high-speed machines. It resists fraying, breakage, and gives outstanding stitch quality even on stretchy or delicate fabrics.

Choosing high-quality threads like Madeira Aerolock, Aeroflock, and Coats Astra will instantly lift your coverstitch work to a professional level.

Why the Correct Needle Size and Type Matters for Coverstitch Sewing

If thread is the "paint," the needle is your brush — and using the wrong size or type of needle can cause serious problems:

• Skipped stitches, especially on stretchy fabrics

• Needle breakage or bent needles

• Holes or snags in your fabric

• Unstable seam tension

Coverstitch machines need specialised needles to handle their unique stitch motion, fabric demands, and high-speed operation.

Best Needles for Coverstitch Machines:

✅ Schmetz ELx705 Needles
Specially engineered for overlock and coverstitch machines, Schmetz ELx705 needles have a reinforced blade and slightly rounded tip. They pierce knits without damaging the fibres, ensuring smooth, consistent stitches every time.

Needle Size Guide:

• 80/12: Light knit fabrics, T-shirts, light jersey

• 90/14: Medium to heavy knits, ponte, sweater knits

Tip: Always use fresh Schmetz ELx705 needles for new projects — a worn needle can be the hidden cause of skipped stitches and fabric damage!

Achieve Professional Coverstitch Results Every Time

Using the best thread for coverstitch sewing and the correct size Schmetz needle transforms your projects from frustrating to flawless.

Here's your winning formula:

✔️ Use premium threads like Madeira Aerolock, Madeira Aeroflock, and Coats Astra
✔️ Choose the correct Schmetz ELx705 needle size for your fabric
✔️ Replace needles regularly to maintain stitch quality
✔️ Match your thread and needle to your project for optimal results

When you invest in the right threads and needles, your coverstitch sewing machine performs at its best — delivering strong, stretchy, and professional-quality seams on every project.

Shop the Best Coverstitch Supplies Now

Ready to upgrade your sewing results?
You can shop Madeira Aerolock, Madeira Aeroflock, Coats Astra threads, and Schmetz ELx705 needles at Direct Sewing Machines & Supplies — New Zealand’s trusted destination for sewing excellence.

👉 Get professional results with every stitch — shop now!