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Thread: Can someone help me identify this type of bolt?

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    Can someone help me identify this type of bolt?

    Hello, Im not sure its the right place to ask this, but can someone help me with getting the name for this bolt:
    https://imgur.com/a/4i013YH
    https://imgur.com/a/kRDwRQA
    Sorry for the low quality, but hopefully it will be clear enough, Im talking about the half circle half flat bolt. Thanks a lot!

  2. The Following User Says Thank You to msacco For This Useful Post:

    Seedtick (08-14-2018)

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    thehomeengineer's Avatar
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    This looks to be simply a shaft with a flat to locate a grub screw for an operating knob or handle. Alternatively, it could be for a knob with the corresponding hole and flat for setting the orientation of the switch/dial etc. If it is a bolt it is a case of removing it getting a new bolt and filing/machining the flat in the correct position. I would be very surprised if you could buy one. What is it on/operating?
    Hope this helps.

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    Quote Originally Posted by thehomeengineer View Post
    This looks to be simply a shaft with a flat to locate a grub screw for an operating knob or handle. Alternatively, it could be for a knob with the corresponding hole and flat for setting the orientation of the switch/dial etc. If it is a bolt it is a case of removing it getting a new bolt and filing/machining the flat in the correct position. I would be very surprised if you could buy one. What is it on/operating?
    Hope this helps.
    Actually its much less complex than you think it is, I want to connect some sort of handle to it, something similar to this: https://agenaastro.com/agena-flexibl...andle-9-5.html

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    Should fit direct to the shaft just need to make sure that the shaft and bore of handle are the same diameter and the lock screw fits on the flat of the shaft.

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    If I had to guess, its a shaft element to permit attachment of a flexible shaft (with a knob at the far end) to control movement of a telescope tube (or some kind of alti-azimuth or rotary mounting system). I don't recall it has a specific name but the protruding part is simply half-round shaft section to allow for a really solid connection to a flexible shaft that is secured by a thumb screw.

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    Quote Originally Posted by msacco View Post
    Hello, Im not sure its the right place to ask this, but can someone help me with getting the name for this bolt:
    https://imgur.com/a/4i013YH
    https://imgur.com/a/kRDwRQA
    Sorry for the low quality, but hopefully it will be clear enough, Im talking about the half circle half flat bolt. Thanks a lot!
    How about, 'declination slow motion control shaft' ?
    edit: The end inside the case will be a worm screw.
    Last edited by martink; 08-15-2018 at 03:01 AM. Reason: added

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    Well to start with, the protruding D shape is not a bolt. It is, as others have already mentioned, some sort of shaft for a rotary control. And the other part with the screwdriver slots is meant to be held with one of these
    Can someone help me identify this type of bolt?-f5f4b14huo3xko0.large.jpg
    whilst turning the nut that secures it in place. And that is not a bolt either.

    Cheers Phil

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    if you don't have the specific slotted screwdriver as shown by Phil. Just use a pair of needle nose pliers.
    Smoke makes electronics work, if it escapes the equipment breaks.
    Got to keep the smoke in. bla bla bla - TUNE FOR MAXIMUM SMOKE that's what i say.

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    or circlip pliers
    Smoke makes electronics work, if it escapes the equipment breaks.
    Got to keep the smoke in. bla bla bla - TUNE FOR MAXIMUM SMOKE that's what i say.

  11. #10
    MeJasonT's Avatar
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    thread may by a PG size ? often used with glads although imperial and metric threads are also used on rotary pots like the one shown.
    Smoke makes electronics work, if it escapes the equipment breaks.
    Got to keep the smoke in. bla bla bla - TUNE FOR MAXIMUM SMOKE that's what i say.

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