The thread weight is a way of describing the thickness of thread. The lower the weight number, the thicker or heavier the thread, and a higher weight number means a thinner or lighter thread. Embroidery threads are usually available in several different thread weights, with 40 being the most common. The majority of embroidery designs are digitized for 40-weight thread. The 40 weight thread should be your go to thread for all around everyday embroidery. The second most common is the finer and lighter 60 weight. You would want to use it anywhere fine detail or small lettering is required and for decorative stitching on delicate fabrics. When you have a design digitized, you should try to indicate which areas of the design will be stitched in 60 weight so that the digitizer can try to avoid having to use fill.
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