What do the Sizes of Linen Thread Actually Mean? It's Complicated. – Peachey Conservation
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I made up this chart for myself when I first got my sewing machine, to help me try and understand nee… | Sewing machine thread, Thread size chart, Needle and thread
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A spiffy reference chart: Your guide to understanding how the various needle and thread sizes relate. | Sewing Dude
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Does anyone understand Coats & Clark thread designations? - Victorian Sweatshop Forum