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Here is an image of a worm gear. What is english word for mechanical element (two of them will be necessary for a worm gear) in which the worm shaft will "lie" and rotate?

Here is one photo of the element where it is part of a housing; I need it as separate mountable element (I will mount it on plate):

unknown element in worm gear housing

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Anything that holds a shaft and allows it to rotate is called a "bearing". It could be a simple metal bushing or a complete assembly with inner and outer races holding balls or rollers.

A bearing that is designed to be mounted to a surface is sometimes called a "pillow block".

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    $\begingroup$ +1 I have also heard "bearing block" occasionally. $\endgroup$
    – Mike
    Commented Apr 14, 2015 at 4:46
  • $\begingroup$ Or 'mounted bearing,' more generically. $\endgroup$
    – Ethan48
    Commented Apr 14, 2015 at 13:24
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Not only does the shaft have a "bearing" surface but the ends of the shaft also need something to "bear" against due to the "thrust" of the shaft in either direction. So I would add the term "thrust bearing" to the mix some where in there ... this can be as simple as adding a single steel ball for a bearing surface to each end of the shaft to deal with the worm gear's lateral movement unless you have dealt with this in some other way.

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