Staff Answer
May 04, 2026 - 09:57 AM
Yes you can use 30 wt. for some embroidery designs. Sulky 30 wt. Cotton is 1/3 heavier than 40 wt. rayon or poly which is the "normal" embroidery thread. So virtually all designs are digitized for that 40 weight. Generally speaking, you can use 30 wt. for lighter density type of designs. You need a 90/14 needle and, even better, a 90/14 topstitch. If you have software, and you know how to fiddle with density, than that might help, too. Slowing your machine down helps the machine squeeze the 30 wt. into 40 wt. spaces, too. A lot depends on how the design is digitized. You can just look at some designs and know that adding 1/3 more thickness to the fill is going to be challenging.
On most embroidery machines you can enlarge the design up to 20% on the machine screen without changing the density. This will allow more room for the 30 wt. thread. It's not an exact science, so you might want to do some experimenting with your machine.
We also carry 50 wt. cotton thread, and you have the exact opposite problem with the lighter thread. An important thing to remember is that cotton "lints" a lot. You have to clean your bobbin area a LOT more often with cotton threads, and this includes even the highest quality cotton threads like ours. It's just the nature of cotton. You still want to use a 60 wt. bobbin thread to minimize bulk for the design that way. We have used 30 wt. top and bobbin for quilting stitches, but that doesn't require dealing with the digitizing of fill areas.
On most embroidery machines you can enlarge the design up to 20% on the machine screen without changing the density. This will allow more room for the 30 wt. thread. It's not an exact science, so you might want to do some experimenting with your machine.
We also carry 50 wt. cotton thread, and you have the exact opposite problem with the lighter thread. An important thing to remember is that cotton "lints" a lot. You have to clean your bobbin area a LOT more often with cotton threads, and this includes even the highest quality cotton threads like ours. It's just the nature of cotton. You still want to use a 60 wt. bobbin thread to minimize bulk for the design that way. We have used 30 wt. top and bobbin for quilting stitches, but that doesn't require dealing with the digitizing of fill areas.
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