Looking for a fastener - 1/2-13 x 1/2" cap screw center drilled/tap like "vent" screw
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  1. #1
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    Default Looking for a fastener - 1/2-13 x 1/2" cap screw center drilled/tap like "vent" screw

    Do these exist commercially? It's basically to use as a locking mechanism to set tension on a simple assembly with a wave spring. Obviously they are straightforward to make, I'm just curious if they are already offered somewhere. I checked McMaster and vented screws are available, but the sizes stop at 1/4". I can make them if need be, but was just curious if someone already make something like that. I drilled and tapped one yesterday on the lathe and it works for what I need. I'm able to set the tension of the 1/2-13 and then just reach down the center and use a 1/8 allen to bottom out a 1/4-20 to bind up the threads. Looking at just using loctite as well.

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    Quote Originally Posted by kazlx View Post
    Do these exist commercially? It's basically to use as a locking mechanism to set tension on a simple assembly with a wave spring. Obviously they are straightforward to make, I'm just curious if they are already offered somewhere. I checked McMaster and vented screws are available, but the sizes stop at 1/4". I can make them if need be, but was just curious if someone already make something like that.
    Doo you mean like the head is "drilled for safety wire" ?

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    Quote Originally Posted by digger doug View Post
    Doo you mean like the head is "drilled for safety wire" ?
    No, drilled along the axis of the bolt. Like a vented bolt. I doubt I'd find drilled and tapped, but thought maybe I can find them already drilled and just tap them.

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    You're chances of finding them pre-drilled in a useful tap drill size is probably pretty low.

    How many are you expecting to need?

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    Quote Originally Posted by J Gilles View Post
    You're chances of finding them pre-drilled in a useful tap drill size is probably pretty low.

    How many are you expecting to need?
    That's what I was figuring, but it never hurts to ask. Probably 500-1000.

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    You might reach out to a custom screw manufacturer and get them quoted. If they are already setup to run custom cap screws, adding a drilling operation that isn't very deep shouldn't be difficult. Plus they could probably send them to you tapped so you can just install them and save some of your time.

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    Quote Originally Posted by J Gilles View Post
    You might reach out to a custom screw manufacturer and get them quoted. If they are already setup to run custom cap screws, adding a drilling operation that isn't very deep shouldn't be difficult.
    There are members on here that doo this kind of work.
    Simply post the details in the Manufacturing Resources section.

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    Quote Originally Posted by kazlx View Post
    That's what I was figuring, but it never hurts to ask. Probably 500-1000.
    At that quantity, it might make sense to have someone run them in a VMC. Machine a couple high-density fixtures and do them 50 or so at a time.

    Regards.

    Mike

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    Quote Originally Posted by Finegrain View Post
    At that quantity, it might make sense to have someone run them in a VMC. Machine a couple high-density fixtures and do them 50 or so at a time.

    Regards.

    Mike
    That’s basically my plan. I’ll just modify the stock hardware myself if need be.

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    Set screws with through hex holes are a standard part. "Hollow-lock set screws" or "jam set screws". The 1/4" hex through hole on a 1/2-13 jam set screw would be big enough to get a 1/8" hex key through, no problem.

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    I know them as vacuum screws. This outfit has 1/2-13.
    Bill D.

    Inch Socket Head Cap Screws | CDS

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    Quote Originally Posted by Bill D View Post
    I know them as vacuum screws. This outfit has 1/2-13.
    Bill D.

    Inch Socket Head Cap Screws | CDS
    now that is some cool stuff looks like they have it all


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