What Is the Difference Between Tex 30 and 40 Thread?

Tex is a numerical system that categorizes the thickness or weight of a thread. Generally, Tex 30 is considered thinner than Tex 40. Made from 100% core-spun polyester, this thread offers superior strength and durability, making it ideal for projects that require frequent washes or endure strain. It’s compatible with a range of machines, including the popular Janome CoverPro family of machines. Choose the right tex size based on your fabric and project requirements to achieve the best results and ensure your creations withstand the test of time.

What Is the Difference Between Tex 30 and 40 Thread?

Tex 30 and Tex 40 are two common thread sizes used in sewing and textile industries. The Tex size refers to the weight or thickness of the thread. Tex 30 is a lighter weight thread compared to Tex 40.

It creates less bulk and is ideal for fine stitching, hemming, and finishing.

It’s better suited for medium to heavy-weight fabrics and projects that require more durability and strength.

Madeira Aerolock Premium Serger thread is specifically designed for sergers and overlock machines. These machines require strong and durable thread to withstand the high-speed stitching they perform. Madeira Aerolock thread, available in both Tex 30 and Tex 40 sizes, provides excellent strength and thread performance on these machines.

It’s a core-spun thread, meaning it’s a polyester core with polyester fibers wrapped around it. This construction enhances the threads strength, reduces the risk of breakage, and ensures it can withstand repeated washing and strain.

It’s important to select the right Tex size based on the fabric weight, project requirements, and desired thread strength. So, consider the project you’re working on and choose the appropriate Madeira Aerolock thread size for the best results.

Different Types of Thread Materials and Their Properties

There are various types of thread materials available, but when it comes to Tex 30 and Tex 40 threads, the main difference lies in their size and strength.

Tex size refers to the weight of the thread. Tex 30 thread is lighter and thinner compared to Tex 40, which is slightly thicker and heavier. This means that Tex 40 thread has a higher thread count and is generally stronger than Tex 30.

Both Tex 30 and Tex 40 threads have their own set of properties that make them suitable for different applications. For instance, Tex 30 thread is commonly used for lighter-weight fabrics, such as lightweight cotton, silk, or synthetic materials, where strength isn’t the primary concern. On the other hand, Tex 40 thread is often preferred for medium-weight fabrics and projects that require more durability, like upholstery, outdoor fabrics, or heavy-duty garments.

It’s important to choose the right thread size based on the specific requirements of your project to ensure optimal results. Whether you opt for Tex 30 or Tex 40, understanding their differences can help you make an informed decision for your sewing or stitching needs.


When choosing a thread for your sewing projects, it's important to consider the material and purpose of your garment or item. It’s high quality and longevity ensure that your stitches will withstand frequent washing and strain. Whether you're a professional seamstress or a hobbyist, investing in a top-tier thread like Madeira Aerolock will enhance the longevity and durability of your creations.

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