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Thread: ER 20 Collet Blocks

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    Supporting Member olderdan's Avatar
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    ER 20 Collet Blocks

    I have not been able to find collet blocks in this size as they seem to start at ER32.
    In my AJS restoration I have had to make many new bolts and it is cheaper to use round stock than buy correct size of hex bar. I also use them for slotting screw heads.
    I have made two collet blocks for hex and square bolt heads, these are not precision but within a .002 thou T.I.R. which is fine for bolt heads etc and used in my vertical slide on the lathe.
    ER 20 Collet Blocks-blocks.jpgER 20 Collet Blocks-bolt.jpg

    A typical use is a Triumph repair chain case adjuster bolt which has a stripped thread, the large one gets bonded in and both have O rings.
    I recently past over a nice milling machine locally but a 82 years young I decided not to bother.

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  2. The Following 2 Users Say Thank You to olderdan For This Useful Post:

    brianr47 (Jan 23, 2025), ductape (Jan 24, 2025)

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    Thanks olderdan! We've added your ER20 Collet Blocks to our Machining category,
    as well as to your builder page: olderdan's Homemade Tools. Your receipt:




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    Supporting Member tonyfoale's Avatar
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    Quote Originally Posted by olderdan View Post
    I have not been able to find collet blocks in this size as they seem to start at ER32..
    I have these in ER32 but I seem to recall seeing them for ER25.



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