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  1. 01-03-2018 #2
    Desertboy's Avatar
    Lives in Leicester, United Kingdom.
    Desertboy
    Last Activity: 14-06-2025 Has been a member for 8-9 years. Has a total post count of 1,005. Received thanks 85 times, giving thanks to others 756 times.
    Quote Originally Posted by Tenson View Post
    Hi,

    I've got two different brands of 15mm linear profile rail (one Chinese import, one SBC Linear). Both have identical mounting holes that are 4.5mm dia. with a countersunk hole for the bolt head 7.5mm dia.

    I'm not sure what bolts I am supposed to use here?

    M4 would fit through the hole, but all M4 bolts with a countersink are 8mm dia. on the head so they don't fit. An M4 cap head would fit the hole but it doesn't seem right to use that on a countersunk hole because the contact patch will only be on the edge on the head.

    Am I supposed to use some kind of imperial size?


    Thanks!
    15mm I assume is Hiwin style rail, I have original and clone rail and both take M4 A2 stainless steel bolts.

    This is my clone rail
    https://www.ebay.co.uk/itm/15-1500mm...e/202182780858
    Last edited by Desertboy; 01-03-2018 at 04:58 PM.
    http://www.mycncuk.com/threads/10880...60cm-work-area My first CNC build WIP 120cm*80cm

    If you didn't buy it from China the company you bought it from did ;)
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