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Thread: Bolt size

  1. #1
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    Default Bolt size

    Someone just put a list of common bolt sizes in the 'Shop Made Tools' thread. Not wanting to clog up the thread with questions, I post here.

    Wasn't there a 3/16" bolt or screw size at one time? I seem to remember buying all-thread in that size. But my remembery is old and not to be trusted.

    Bill

  2. #2
    Join Date
    Aug 2011
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    Quote Originally Posted by browne92
    Someone just put a list of common bolt sizes in the 'Shop Made Tools' thread. Not wanting to clog up the thread with questions, I post here.

    Wasn't there a 3/16" bolt or screw size at one time? I seem to remember buying all-thread in that size. But my remembery is old and not to be trusted.

    Bill
    I believe it's known as 10-24 these days, but I still see a lot of 10-24 fasteners sold as 3/16".

  3. #3
    Dr Stan Guest

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    Quote Originally Posted by charlie gary
    I believe it's known as 10-24 these days, but I still see a lot of 10-24 fasteners sold as 3/16".
    #10-24 or in the case of UNF 10-32

  4. #4
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    I'm not sure if 10-24 is equal to 3/16, or if it's just close enough that you can't detect a difference. At any rate, it seems that everything smaller than 1/4 inch is rated like 10-24, 8-32, etc. I tried to find some 1/8 bolts once- seems those belong in another category- stove bolts.

  5. #5
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    IT is not STRICTLY the same bolt size. In the "good old days," there used to be a set of bolt sizes that I knew as "stove bolts." They were, I think, 5/16, 1/4, 3/16, and 1/8. They were always fitted with square nuts. They seem to have been absorbed into the "common" sizes, and even 12-24 is pretty rare now.
    Duffy, Gatineau, Quebec

  6. #6
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    My "remembry" says that 12-24 was the same as 3/16 - in fact I think it measured out at .188.

    If youve ever worked on old tools/machines, youll run into the 12-24. I recently reworked a SB 10L lathe and it (and many others) had that thread on the end of the cross and compound feed screws that odd rounded/slotted nut that held the handles on. Amazingly, I dug through my collection of taps and had one!
    If everything seems to be going well, you have obviously overlooked something........

  7. #7
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    Number 12 screw has a major diameter of .216" the other "oldie" is #14 , major dia of .242.... while I'm at it ...#16 - .268 ... #18 - .294

    These were in the old American Standard system
    Joe B

  8. #8
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  9. #9
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    According to my 1924 Machinery's Handbook, fractional screws started at 1/16", and machine screws went to number 30. I believe machine screws went as high as number 50 at one time.

    Both series could be had in course and fine threads as well.
    Jim H.

  10. #10
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    Machinery's handbook......

    #10 screw major diameter 0.190 ~~~ - 0.187 (3/16") for practical everyday use.

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