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  1. 18th April 2014, 05:31 AM #1
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    Default Mystery hardware

    I don't suppose anyone can tell me what either of these thingies are for?

    Both are roughly 1/4" in shaft size. The one on the left, with the thread, has three protruding "nipples" on the underside of the head, while the one on the right has no thread and its surfaces are completely smooth. There are no "holes" for a screw driver and both are smooth circles at the "head" so no spanner either.

    They came out of a big mixed box of bolts and screws that a mate gave to me so I've got not context at all as to where they would have been used. I may have said that they were feet for something, but they're both pretty small, so I doubt it.
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  3. 18th April 2014, 06:00 AM #2
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    The first one, to me, looks like a drain plug for some machinery. I don't know but that would be my guess.
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  4. 18th April 2014, 09:05 AM #3
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    Second looks very similar to a aircraft rivit
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  5. 18th April 2014, 09:19 AM #4
    artme
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    Question

    Is the first one a mower blade bolt??
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  6. 18th April 2014, 09:42 AM #5
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    Quote Originally Posted by stevogq View Post
    Second looks very similar to a aircraft rivit
    Bingo. It's called a stepped rivet.

    Gold star for you . Thank you

    Quote Originally Posted by artme View Post
    Is the first one a mower blade bolt??
    And another bingo.     - Update: Filthy lies


    I'll give PLD a silver star for effort and because that's what I was thinking too
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  7. 18th April 2014, 12:39 PM #6
    beer4all
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    IMO, the one on the left is not a mower blade bolt. I believe "1/4 would be too small diameter wise. Most mower bolts are "7/16 or "3/8. It seems to me that the "nipples" would be for biting into a softer material to stop it turning when a nut is secured onto the thread. Possibly for wood and on an exterior surface ??

    The one on the right does appear to be a rivet though.......
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  8. 18th April 2014, 02:19 PM #7
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    Good catch beer. The mystery remains...
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  9. 18th April 2014, 02:34 PM #8
    beer4all
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    Quote Originally Posted by RedShirtGuy View Post
    Good catch beer. The mystery remains...
    Further update...........appears to be a "Projection Weld Screw". Clamped to metal sheet, project etc. then current passed through to fuse or weld in place permanently........
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  10. 18th April 2014, 02:35 PM #9
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    A-HA!!!

    The first one is an elevator bolt. (Update: but also likely to be a projection weld screw - see post directly above and below)

    A common application for elevator bolts is industrial or agricultural belting systems or conveyor systems, where head clearances must be minimal and where a wide thin bearing surface is desired.
    The "nipples" (which are really called "fangs") are, as beer4all suggested, for biting into the soft surface of the belt to stop the bolt spinning. Other bolts might have a square neck instead of fangs for the same purpose.

    Nice work Scooby gang




    I'll have artme's gold star now.


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  11. 18th April 2014, 02:42 PM #10
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    Quote Originally Posted by beer4all View Post
    Further update...........appears to be a "Projection Weld Screw".
    Oooohhh...Yes, it does look like it could be called that too. I might even go so far as to say that given the small size of the fangs on it, you might be right.

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  12. 18th April 2014, 02:43 PM #11
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    Winner winner chicken dinner lol
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  13. 18th April 2014, 02:45 PM #12
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    Quote Originally Posted by RedShirtGuy View Post
    Oooohhh...Yes, it does look like it could be called that too. I might even go so far as to say that given the small size of the fangs on it, you might be right.

    I'll go you halves on the star
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  14. 18th April 2014, 05:07 PM #13
    artme
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    Dang!! Missed again!!

    ...and you can have your star!!!
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