# Z slider ball screw question

**URL:** <https://forum.onefinitycnc.com/t/z-slider-ball-screw-question/13884>\
**Category:** Uncategorized\
**Created:** [June 29, 2022, 6:27pm UTC](https://forum.onefinitycnc.com/t/z-slider-ball-screw-question/13884 "2022-06-29T18:27:23Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Machinist](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/machinist/32/36465_2.png) [@Machinist](https://forum.onefinitycnc.com/u/Machinist)\
**Post date:** [June 29, 2022, 6:27pm UTC](https://forum.onefinitycnc.com/t/z-slider-ball-screw-question/13884/1 "2022-06-29T18:27:23Z")

</div>

To save me from tearing my machine apart, can anyone tell me the diameter of the machined step that engages the shaft coupler at the top of the Z axis ballscrew?

Thanks in advance!

![image](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/1/b/1b79ffd368f1d627a435a5212b5ac3f015a03ac1.png)