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Thread: What are those bolts called for tripods etc that have threads on end, then no threads

  1. #1
    Jon Shiu's Avatar
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    What are those bolts called for tripods etc that have threads on end, then no threads

    Trying to search for the technical name for those bolts/knobs with the threads on end, then a thinner shaft section with no threads. Like the kind on tripods. Would anything like that be available in a hardware store. (I think there is a guy on here who is a hardware store clerk who knows a lot?)

    It looks like this, only I would like a longer bolt with about 1.5" of extension.Click image for larger version. 

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    Jon
    my black and white photos of the Mendocino Coast: www.jonshiu.com

  2. #2

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    Re: What are those bolts called for tripods etc that have threads on end, then no thr

    Captive?

  3. #3

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    Re: What are those bolts called for tripods etc that have threads on end, then no thr

    Just about to say what Jonathan did.

    http://www.mcmaster.com/#thumb-screw...7rexwki3nnn1ng

  4. #4

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    Re: What are those bolts called for tripods etc that have threads on end, then no thr

    Are you talking about carriage bolts? http://en.wikipedia.org/wiki/Carriage_bolt

    I don't think they make them that short though.

  5. #5
    Jon Shiu's Avatar
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    Re: What are those bolts called for tripods etc that have threads on end, then no thr

    Thanks, I'll search for captive bolt or knob. I need them for a bi-post studio stand to fasten the camera to the platform.

    Jon
    my black and white photos of the Mendocino Coast: www.jonshiu.com

  6. #6

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    Re: What are those bolts called for tripods etc that have threads on end, then no thr

    You can find a full threaded bolt that fits your need, chuck into a drill, and file the shaft to meet your needs. I've done that a few times.

  7. #7
    Tracy Storer's Avatar
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    Re: What are those bolts called for tripods etc that have threads on end, then no thr

    I don't think I've ever encountered them ready-made other than as replacement parts from tripod companies. Your friendly neighborhood machine shop should be able to turn the threads off a screw to a shoulder just under the root diameter for clearance for not too much money.
    Tracy Storer
    Mammoth Camera Company tm
    www.mammothcamera.com

  8. #8
    Tin Can's Avatar
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    Re: What are those bolts called for tripods etc that have threads on end, then no thr

    This is from my Deardorff BiPost. I don't have any spares.

    Click image for larger version. 

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    sin eater

  9. #9

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    Re: What are those bolts called for tripods etc that have threads on end, then no thr

    It may not be quite as good as the original equipment, but I bought a couple of these from Amazon because they were so cheap - a 3/8" x 16 threaded stud with handle - $3.84 each! Just needed to add a thick washer and I was back in business. http://amzn.com/B00A9N567U

    Click image for larger version. 

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  10. #10

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    Re: What are those bolts called for tripods etc that have threads on end, then no thr

    Captive bolt with retainer?
    Retainer could be a circlip.

    The "thumb-screw" type cross-hatch texture is called "knurled". It's a machining / lathe technique.

    If you're looking for the type that screw in, and then the other nut adds force to take up the slack you're looking for a lock nut. Or knurled lock nut.

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