Best Overlocker Thread NZ: Coats Astra vs Madeira Aerolock vs Gütermann Toldi-Lock

If you’ve ever battled with frayed seams, snapped threads or lint build-up in your overlocker, the problem might not be your machine — it might be your overlocker thread.

Whether you're sewing activewear, t-shirts, or professional garments, using quality overlocker thread makes a world of difference. In this blog, we’ll compare three of the most popular threads in New Zealand: Coats Astra, Madeira Aerolock, and Gütermann Toldi-Lock — and help you choose the best one for your machine and sewing style.

What Is the Best Overlocker Thread?

When choosing the best thread for your overlocker (also called a serger), the most important factors are:

• Strength and durability

• Low lint production

• Stretch and softness (especially for knits)

• Compatibility with your fabric and machine

🧵 Coats Astra Overlocker Thread (Spun Polyester)

Type: Spun Polyester
Strength: Medium to High
Finish: Matte
Best For: Everyday garments, woven fabrics, general sewing
Price Range: Budget-friendly

✅ Pros:

• Great value for money

• Smooth performance on most domestic overlockers

• Low lint compared to many other spun threads

• Widely available in New Zealand

❌ Cons:

• Not as lustrous or smooth as core-spun or textured threads

• Slightly more lint than filament threads

🧵 Madeira Aerolock Overlocker Thread (Core-Spun Polyester)

Type: Core-Spun Polyester
Strength: High
Finish: Semi-sheen
Best For: High-speed overlocking, activewear, professional garments
Price Range: Mid to High

✅ Pros:

• Designed specifically for overlock and coverstitch machines

• Very strong and produces minimal lint

• Excellent colourfastness and stretch recovery

• Great for professional or commercial use

❌ Cons:

• Pricier than spun polyester

• Colour range may be more limited locally in NZ

🧵 Gütermann Toldi-Lock Overlocker Thread (Textured Polyester)

Type: Textured Polyester
Strength: Medium
Finish: Soft with slight stretch
Best For: Knits, lingerie, athletic wear
Price Range: Mid-range

✅ Pros:

• Soft, slightly stretchy texture ideal for soft seams

• Great for stretch and delicate fabrics

• Consistent quality and low lint

❌ Cons:

• Slightly bulkier, may need tension adjustments

• Not suitable for very structured or thick woven seams

🧵 Overlocker Thread Comparison Table

Best Overlocker Thread for Knits, Activewear & Everyday Sewing

Each overlocker thread brings something different to the table. Here’s a quick summary:

• Budget-conscious sewist? Choose Coats Astra for good performance at a great price.

• Sewing professionally or working at high speed? Go with Madeira Aerolock.

• Sewing soft knits, lingerie or activewear? Gütermann Toldi-Lock is your go-to.

Still unsure which to choose? Contact our team or visit our showroom for tailored advice.

🚀 Shop Overlocker Threads Online in NZ

Choosing the right thread makes all the difference. Whether you're after something soft for knits, strong for professional finishes, or economical for everyday use, we’ve got you covered.

🛒 Browse our full range of overlocker threads now 

Madeira Aerolock

Coats Astra

Gutermann Toldi-Lock

🤔 Frequently Asked Questions

What is the best overlocker thread for knits?

Gütermann Toldi-Lock is ideal for knits. It offers a soft finish and stretch, perfect for t-shirts, leggings and lingerie.

Is Coats Astra good for overlockers?

Yes, Coats Astra is a reliable, budget-friendly thread that works well in most domestic overlockers.

Can I use regular sewing thread in my overlocker?

You can, but it's not recommended. Overlocker threads are specially designed for high-speed sewing and tension, ensuring smoother seams and fewer breakages.

Where can I buy overlocker thread in New Zealand?

Right here at Direct Sewing Machines & Supplies! We ship NZ-wide and stock trusted brands.