# Collets and Nuts for Redline

**URL:** <https://forum.onefinitycnc.com/t/collets-and-nuts-for-redline/29821>\
**Category:** Accessories\
**Created:** [December 6, 2024, 2:27am UTC](https://forum.onefinitycnc.com/t/collets-and-nuts-for-redline/29821 "2024-12-06T02:27:26Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Borgorl](https://avatars.discourse-cdn.com/v4/letter/b/87869e/32.png) [@Borgorl](https://forum.onefinitycnc.com/u/Borgorl)\
**Post date:** [December 6, 2024, 2:27am UTC](https://forum.onefinitycnc.com/t/collets-and-nuts-for-redline/29821/1 "2024-12-06T02:27:26Z")

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Hello,  
While waiting for the elite with redline spindle and atc, I wanted to get the collets and nuts ordered. I’ve never used a spindle before so wanted to see if my understanding of collet sizes is correct. The redline is an ER20 so the nuts I need are all ER20 standard nuts right and doesn’t depend on shank size? As for the collets, you need multiple ER20 collets depending on the shank size right? If I mainly use 1/4” bits but want one 1/8” then for the ATC I will need 3 1/4” ER20 collets and 1 1/8” ER20 collet, all with the same standard ER20 nuts?  
Thanks in advance

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**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\
**Post date:** [December 6, 2024, 12:18pm UTC](https://forum.onefinitycnc.com/t/collets-and-nuts-for-redline/29821/2 "2024-12-06T12:18:56Z")

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Hey Borgorl,

you need one collet for each shank size. You can buy a set like shown here

[![](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/9/b/9b95ba8bb2715dfee4fb7f7fca03157cdcffeb01.jpeg "CNC Finale: Automatic Toolchanger Spindle Install & Testing") ](https://www.youtube.com/watch?v=vB_FvkllLPc)

But maybe you use only 6 and 8 mm bit shanks. Then those two will be enough. With an ATC, depends on number of how many different tools you use