Embroidery Thread Weights & What Do They Mean? (2024)

Embroidery Thread Weights & What Do They Mean? (1) Embroidery Thread Weights & What Do They Mean? (2)

Thread Weights And What Do They Mean?

Thread weight describes the thickness of embroidery thread and bobbin thread. The larger the number, the thinner the thread. The smaller the number,the thicker the thread.


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1.Designs: Designs generally require a specific thread weight due to how the design is digitized.If the thread is too thick for the stitch area, there will be overlapping threads which could cause a bird’s nest under the throat plate.If the thread is too thin for the stitch area, the coverage will not be adequate.

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2.Needle Size: Thread weight determines the size of the needle used in your machine.(The thicker the thread, the larger the needle hole needs to be.)

a. Needle selector chart >
b. Anatomy of needle chart >

3.Coverage VS Detail: Heavy weight threads cover a larger area with fewer stitches.Lighter weight threads are used for detail work within designs and/or for small lettering.

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4.Fiber Type: Take into consideration the type of fiber of your thread (Polyester, Rayon, Acrylic, Cotton, etc). Heavier weight threads tend to have more strength while thinner weight threads have less.


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  • Poly 40: The Go To Thread, Durable, Colorfast to Chlorine, Long Lasting
  • Poly 60: Small Lettering, Detail In Designs, Durable, Colorfast To Chlorine, Long Lasting
  • Sulky 40: Brilliant Luster, High Tensile Strength, Natural Fibers
  • Cotty 30: Matte Finish, Natural Fibers, Strong
  • Filaine 12: Vintage Look, Wool Like Features, Great Coverage
  • Mety 30 And 40: Glamorous Sparkle, Multiple Colors, Two Thicknesses
  • Mono 80: Transparent, Accent Designs

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Thread weights are a critical aspect of embroidery, influencing both the aesthetics and functionality of the final product. As someone deeply immersed in the world of embroidery, let me delve into the intricacies of thread weights and how they play a pivotal role in achieving impeccable designs.

Firstly, thread weight refers to the thickness of both embroidery thread and bobbin thread. The numeric value assigned to thread weight is inversely proportional to its thickness; a larger number denotes a thinner thread, while a smaller number signifies a thicker thread. This fundamental concept serves as the foundation for making informed decisions in the embroidery process.

Let's explore the key concepts presented in the article:

  1. Designs and Digitization:

    • Thread weight is closely tied to the digitization of designs. Optimal results are achieved when the thread thickness aligns with the stitch area. Too thick a thread can lead to overlapping threads and potential issues under the throat plate. On the other hand, if the thread is too thin, coverage becomes inadequate.
  2. Needle Size:

    • Thread weight directly influences the choice of needle size for your embroidery machine. The thicker the thread, the larger the needle hole needs to be. This correlation ensures proper stitching without causing damage to the fabric or compromising the integrity of the design.
    • Reference charts such as the needle selector chart and anatomy of needle chart are indispensable tools for selecting the right needle based on thread weight.
  3. Coverage vs. Detail:

    • Thread weight plays a crucial role in balancing coverage and detail in embroidery. Heavy weight threads are ideal for covering larger areas with fewer stitches, while lighter weight threads excel in intricate detailing and small lettering within designs.
  4. Fiber Type:

    • Consideration of the thread's fiber type is equally important. Different fibers (Polyester, Rayon, Acrylic, Cotton, etc.) exhibit varying properties. Heavier weight threads generally boast more strength, whereas thinner weight threads offer less strength.
    • Specific thread examples showcase the diverse characteristics:
      • Poly 40: Durable, Colorfast to Chlorine, Long Lasting (Go-To Thread)
      • Poly 60: Suitable for Small Lettering, Detail in Designs, Durable, Colorfast to Chlorine, Long Lasting
      • Sulky 40: Boasts Brilliant Luster, High Tensile Strength, Natural Fibers
      • Cotty 30: Features a Matte Finish, Natural Fibers, Strong
      • Filaine 12: Offers a Vintage Look, Wool-Like Features, Great Coverage
      • Mety 30 and 40: Adds Glamorous Sparkle, Comes in Multiple Colors, Available in Two Thicknesses
      • Mono 80: Transparent, Ideal for Accent Designs

By understanding and manipulating these variables, one can achieve a harmonious balance in embroidery projects, ensuring both visual appeal and structural integrity. Stay tuned for more insights into the fascinating world of embroidery, and remember to follow us on Facebook for the latest updates on sales and events!

Embroidery Thread Weights & What Do They Mean? (2024)
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