# U bolt used in Beta specs?

**URL:** <https://forums.maslowcnc.com/t/u-bolt-used-in-beta-specs/244>\
**Category:** Technical Details\
**Created:** [July 24, 2017, 4:52pm UTC](https://forums.maslowcnc.com/t/u-bolt-used-in-beta-specs/244 "2017-07-24T16:52:58Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Matt\_Nelson](https://avatars.discourse-cdn.com/v4/letter/m/c89c15/32.png) [@Matt\_Nelson](https://forums.maslowcnc.com/u/Matt_Nelson)\
**Post date:** [July 24, 2017, 4:52pm UTC](https://forums.maslowcnc.com/t/u-bolt-used-in-beta-specs/244/1 "2017-07-24T16:52:58Z")

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I loved the look from the arms used in the beta, so that’s what I built. What are the specs on the u-bolt used in the beta kits so I can find one locally?

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**Author:** ![blurfl](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/blurfl/32/9_2.png) [@blurfl](https://forums.maslowcnc.com/u/blurfl)\
**Post date:** [July 24, 2017, 5:08pm UTC](https://forums.maslowcnc.com/t/u-bolt-used-in-beta-specs/244/2 "2017-07-24T17:08:14Z")

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That U-bolts are 2 1/2 “ wide by 2 1/2 “ deep, 5/16-18 thread. I think that more recent versions of the frame rely on screws to affix the motor mounts, though. In any case, make sure that the motor mounts are firmly attached and do not swivel. Holding the motors precisely in position has proved to be very important in the search for accuracy 😉

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**Author:** ![mrfugu](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/mrfugu/32/22_2.png) [@mrfugu](https://forums.maslowcnc.com/u/mrfugu)\
**Post date:** [July 24, 2017, 5:09pm UTC](https://forums.maslowcnc.com/t/u-bolt-used-in-beta-specs/244/3 "2017-07-24T17:09:38Z")

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They should be listed here, however I have not verified the accuracy.

[DIY Kit Mechanical Equivalent Parts](https://github.com/MaslowCNC/Mechanics/wiki/DIY-Kit-Mechanical-Equivalent-Parts)

Please update if inaccuracies are found.

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**Author:** ![blurfl](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/blurfl/32/9_2.png) [@blurfl](https://forums.maslowcnc.com/u/blurfl)\
**Post date:** [July 24, 2017, 5:20pm UTC](https://forums.maslowcnc.com/t/u-bolt-used-in-beta-specs/244/4 "2017-07-24T17:20:00Z")

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Newer revisions don’t use the u-bolts. How should we mark them as deprecated?

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**Author:** ![Matt\_Nelson](https://avatars.discourse-cdn.com/v4/letter/m/c89c15/32.png) [@Matt\_Nelson](https://forums.maslowcnc.com/u/Matt_Nelson)\
**Post date:** [July 24, 2017, 5:23pm UTC](https://forums.maslowcnc.com/t/u-bolt-used-in-beta-specs/244/5 "2017-07-24T17:23:34Z")

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Thank you! That is just what I needed!

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<div class="post-metadata">

**Author:** ![blurfl](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/blurfl/32/9_2.png) [@blurfl](https://forums.maslowcnc.com/u/blurfl)\
**Post date:** [July 24, 2017, 5:28pm UTC](https://forums.maslowcnc.com/t/u-bolt-used-in-beta-specs/244/6 "2017-07-24T17:28:41Z")

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Please see my corrected response - mrfugu was correct that the thread size is 5/16-18 😳