Strong Thread Is Called Heavy Duty Thread
by Kelsi Watts: Outside of industrial applications the strongest thread available for use in home sewing projects is called heavy duty thread.
Modern heavy duty thread most often has a core made of a strong material wrapped in a more traditional thread material. Heavy duty thread is ideal for use with embroidery sewing projects.
The best all-purpose sewing thread
Before the invention of polyester thread it was common for natural sewing thread to break frequently and inconveniently. Today, most sewing machine thread has a polyester core that prevents thread breakage by making it slightly stretchy.
As a result the best all purpose thread has a polyester core or is entirely made of polyester.
The best thread for embroidery
Stranded cotton thread, sometimes called embroidery floss, is the preferred thread for embroidery. It is the most commonly used thread on embroidery projects, including cross stitch, because of durability and ease of use. 6 individual strands of fine cotton thread are combined to make a single embroidery floss.
The strongest sewing thread is …
Nylon thread is considered the strongest sewing thread due to its high strength to weight ratio. Nylon thread is a great choice for stitching upholstery, leather, and vinyl. For smooth stitches while sewing at high speed use Nylon thread treated with a friction reducer.

About “Moon” brand thread
Moon is the brand name of a popular thread manufacturered by Coats inc. Moon Thread is made of all-purpose spun polyester ideal for sewing by hand or in consumer machine sewing(including overlockers). Moon thread is available in 150 colors and each reel contains 1000yds (915m) of thread.
The difference between threading and sewing
Thread is a long, thin and flexible material used in sewing. The act of sewing attaches two or more materials together tightly with multiple individual passes of a threaded needle.
Threading is the process of passing thread through material(s) in preparation for later securing the materials together tightly, each individual threading pass is not tightened until later.
Regular sewing thread works in a serger (but)
You can use normal thread in a serger machine but it’s more expensive and will run out more quickly. Using overlock thread on a regular machine, however, is not recommended because it isn’t strong enough for most sewing applications.
Top stitching with embroidery thread (possible)
Contrary to an old weaver’s myth, embroidery thread can be used for top stitching on a sewing machine. Several brands of embroidery threads are available for use on standard, simple home sewing machines.
Polyester, cotton and rayon threads tend to be a bit stronger than regular embroidery thread but all can be used for top stitching with good results.
Using regular sewing thread for embroidery
You can use regular sewing threads for your hand stitching. The results are much like working with embroidery threads and yield a distinct appearance. Don’t be afraid to use regular thread with most embroidery projects for a distinctive finish.
Thread to use for Overlocker machines
For great results on your overlocker machine use good quality, branded, lint free thread. Overlocker thread comes on spools which are larger than traditional sewing machine spools and they are designed to stand upright on the machine.
The reason you want a branded thread with the company name marked on the spool is because you’ll know the company stands behind the quality of their product.