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What Does Tex Mean in Thread? Understanding Its Weight and Importance for Manufacturing

Posted on by hungthinh
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Thread weight is a crucial factor in textiles, influencing not only the strength and durability of seams but also the final appearance of stitches. One technical term that frequently arises in the textile industry is “tex.” If you’ve ever wondered what tex means in thread and why it matters for your sewing or manufacturing projects, this guide will clarify everything.

Whether you are a textile professional, manufacturer, or simply a sewing enthusiast, understanding tex helps you select the right thread for both function and aesthetics. Recognized by international bodies such as ISO, tex provides a standardized system for measuring thread size across the global industry.

Key Thread Terms to Know

Before diving into tex, let’s look at a few common terms used in thread measurements:

  • Thread weight: Refers to the thickness of the thread, directly affecting seam strength, stitch quality, and fabric compatibility.
  • Thread composition: Indicates the material used to make the thread, such as cotton, polyester, or nylon.
  • Thread size: Defines the overall dimension of the thread, which can be measured using different systems like tex, denier, or ticket numbers.

While there are multiple systems, tex offers a clear and consistent measurement that is widely accepted across the textile world.

What Is Tex in Thread?

Tex, short for “textile,” is a unit used to measure thread thickness. It is defined as the weight in grams of 1,000 meters of thread.

For example:

  • If 1,000 meters of thread weigh 30 grams → Tex 30.
  • Higher tex = thicker, stronger thread.
  • Lower tex = finer, lighter thread.

Since tex is a direct system, it offers an easy and reliable way to compare thread sizes without confusion.

Formula:

Tex = (Weight of thread in grams) ÷ (Length in meters ÷ 1,000)

How Tex Is Measured

Tex is determined by weighing a fixed length of thread under controlled conditions. Factors such as fiber content, spinning method, and finishing process can influence the final tex value. Even small changes in production can result in noticeable differences in thread weight, which is why tex is so valuable for ensuring consistency.

Why Tex Matters

Understanding tex helps professionals choose the right thread for specific applications. Here’s why it’s important:

  • Seam Strength – Higher tex threads withstand more tension, making them suitable for upholstery, denim, or outdoor wear.
  • Fabric Compatibility – Lighter fabrics require finer threads; thicker fabrics need heavier ones.
  • Stitch Appearance – A thicker thread creates a bold, decorative look, while finer threads blend in seamlessly.
  • Machine Performance – Using the right tex prevents thread breakage, skipped stitches, and machine malfunctions.

Common Thread Sizing Systems

  • Tex System – Measures the weight in grams of 1,000 meters of thread (direct system).
  • Denier System – Measures grams per 9,000 meters; commonly used for synthetic fibers.
  • Cotton Count (Weight System) – An indirect system, measuring how many meters of thread are needed to weigh 1 kilogram.

While each system has its use, tex remains one of the most straightforward and universal methods for thread measurement.

Thread Classification by Tex Value

Different sewing applications require different tex sizes:

  • Tex 10–30: Fine threads for delicate fabrics, embroidery, and lightweight garments.
  • Tex 25: Medium weight, versatile for everyday sewing tasks.
  • Tex 40–70: Standard range for apparel production, works well with cotton, polyester blends, and light denim.
  • Tex 80–105: Heavy-duty sewing such as upholstery, outdoor clothing, and industrial gear.
  • Tex 150+: Extra-strong threads for leather, canvas, furniture, and footwear.

Tips for Selecting the Right Tex

  1. 1
    Match thread tex to fabric weight – heavy fabrics need heavier threads.
  2. 2
    Consider the end use – items requiring durability (bags, shoes) benefit from higher tex.
  3. 3
    Test before production – check compatibility between fabric, machine, and thread.
  4. 4
    Seek expert advice – thread suppliers can recommend the best tex range for your project.

Final Thoughts

Tex is more than just a technical measurement—it’s a vital tool for ensuring quality and efficiency in sewing and manufacturing. By understanding tex and its impact on seam durability, fabric compatibility, and stitch quality, you can make smarter choices and achieve better results.

Whether you’re sewing delicate garments or constructing industrial products, choosing the correct tex value ensures your work is strong, precise, and professional.

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