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Sometimes we need a strong threaded joint in some part that is produced using molding. Say, this part itself is plastic. Then we design the part with a hole and insert there a.. "threaded bushing"? I don't know the proper name for this element in English. In Russian it is "закладная втулка" (insertable bushing/cylinder/etc - втулка/vtulka is a catch-all term for all things cylindrical that are used in an "axial manner" - something is inserted into them, or they are inserted somewhere, or both). I'm looking for a proper term in English.

I googled for закладная втулка and found this example relevant to my text:

enter image description here

In the text that I'm translating into English, these brass insertable threaded elements in a plastic part produced using molding look like this:

enter image description here

I found a DIN on one Russian page describing "закладная втулка" and this DIN led me to English terms "threaded bushing", "threaded insert". Are these okay?

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As they are going into blind holes, then threaded insert would be better.

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  • $\begingroup$ Would we use the term "threaded bushing" for inserts that pass through the item (have holes both sides of the item)? $\endgroup$ – CopperKettle Oct 4 '18 at 12:05
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    $\begingroup$ For me, a bush is not threaded... it is a type of bearing... $\endgroup$ – Solar Mike Oct 4 '18 at 12:17
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    $\begingroup$ The top picture you show are blind nuts or domed nuts $\endgroup$ – Solar Mike Oct 4 '18 at 12:19
  • $\begingroup$ @SolarMike "For me, a bush is not threaded... it is a type of bearing" Fastener suppliers don't agree with that. See google for lots of examples. $\endgroup$ – alephzero Oct 4 '18 at 21:26
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    $\begingroup$ @CopperKettle I concur with Mike that bushing is a bearing surface (подшипник скольжения). The only thing that comes to mind if someone says "threaded bushing" is a part that has threads on the outside and a smooth cylindrical surface on the inside. That's not the case with the parts in the O.P. $\endgroup$ – Nick Alexeev Oct 5 '18 at 1:00
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This is called "threaded insert" in English.

For more context, here are product page for threaded inserts for plastic: this and this. Both of are major manufacturers based in US.

Additional examples of plastic parts with threaded inserts: this and this.

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