# WR21 bottom plate mounting screw thread size

**URL:** <https://forums.digi.com/t/wr21-bottom-plate-mounting-screw-thread-size/21677>\
**Category:** Digi TransPort WR (Series)\
**Tags:** wr21, mounting, screws\
**Created:** [August 18, 2020, 7:51am UTC](https://forums.digi.com/t/wr21-bottom-plate-mounting-screw-thread-size/21677 "2020-08-18T07:51:52Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jserink](https://avatars.discourse-cdn.com/v4/letter/j/bc79bd/32.png) [@jserink](https://forums.digi.com/u/jserink)\
**Post date:** [August 18, 2020, 7:51am UTC](https://forums.digi.com/t/wr21-bottom-plate-mounting-screw-thread-size/21677/1 "2020-08-18T07:51:52Z")

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Hello:

On the bottom of the WR21 there are two threaded screw holes, we want to attache DIN rail clips there.

Does anyone know the thread size of those two holes and what he maximum screw length should be?

Cheers,  
john

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**Author:** ![jpaczkow](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.digi.com/jpaczkow/32/9_2.png) [@jpaczkow](https://forums.digi.com/u/jpaczkow)\
**Post date:** [September 24, 2020, 1:23pm UTC](https://forums.digi.com/t/wr21-bottom-plate-mounting-screw-thread-size/21677/2 "2020-09-24T13:23:47Z")

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Hello jserink,

I would submit a case to [tech.support@digi.com](mailto:tech.support@digi.com) and we can check the drawings for you to get that information.

James  
Digi Technical Support Engineer