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I've noticed that cheap mini-sewing kits, which can often be purchased for one dollar or some similarly low amount, often do not specify the type of material used to make the thread. Presumably, the thread is made of some inexpensive synthetic material such as polyester. May one use such thread, or is there a concern it may contain shatnez? May one use the thread on wool or linen clothing?

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According to Jerusalem Kosher News Shatnez guide - page 6 at the bottom normal sewing machine thread can not be linen, however button thread, upholstery thread, and thread that appears a bit thicker than normal sewing machine thread may be linen.

I draw the following conclusion from this. If it is not thicker than usual there is no concern.

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  • A potential problem with your answer: I can imagine people using cheap sewing kits to fix buttons, but would them use them in sewing machines? Anyway, I hope your conclusion is valid.
    – Kordovero
    Nov 27, 2014 at 3:14
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    But what if it's wool?
    – msh210 ♦
    Nov 27, 2014 at 3:42
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    @msh210: The bigger problem is linen thread for wool clothing. Wool clothing is way more popular than linen. If one has a linen suit, yes there would be a concern, however in real life that is quite unusual.
    – Gershon Gold
    Nov 27, 2014 at 13:30

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