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  1. #1
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    Default Hex Nut Markings

    I have searched high and low to find the markings on a nut that I have.
    i can identify the the meaning of the three slash marks. Grade c high carbon resitant to elements. But what the heck does the marking with the two triangles mean? Anyone know. see attached drawing.
    Attached Images Attached Images

  2. #2
    Elite Member DieselPower's Avatar
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    Default Re: Hex Nut Markings

    You are correct about the grade mark. The other marking's are most likely the manufacturer's mark. Many nut/bolt manufacturers also mark all their hardware with a mark not unlike you find on gold and silver jewlery that has "hallmark's". I have a book around here somewhere that has alot of the manufacturers marks in it. I'll try to see if I can find it and look up the mark for you.

  3. #3
    Veteran Member gordon21's Avatar
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    Default Re: Hex Nut Markings

    Here's a chart for land based fasteners. There are more markings for aviation hardware not on this generic chart.

    Bolt Head Markings Chart by Zero Fasteners
    Lewis Gordon

    JD 790, 300 FEL, 5' KK rotary mower, 5' boxscraper, Huskee 3PT logsplitter, JD#39N sickle mower and a Jinma 6" chipper in JD colors.

    My XUV gas Gator wants a brother !!!!!!!! (the diesel kind)

  4. #4
    Elite Member DieselPower's Avatar
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    Default Re: Hex Nut Markings

    Those are still ASTM/SAE marking's though and not manufacturers marking's.

  5. #5
    Veteran Member gordon21's Avatar
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    Default Re: Hex Nut Markings

    Here are some more markings, but I still don't see ones similar to your picture. They must be a MFGR mark or something really obscure if they are not on one of the two charts I posted.

    See page 2 of the Adobe file when the link opens.
    http://www2.tech.purdue.edu/at/cours...3-1B/CH7_3.pdf
    Lewis Gordon

    JD 790, 300 FEL, 5' KK rotary mower, 5' boxscraper, Huskee 3PT logsplitter, JD#39N sickle mower and a Jinma 6" chipper in JD colors.

    My XUV gas Gator wants a brother !!!!!!!! (the diesel kind)

  6. #6
    Elite Member DieselPower's Avatar
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    Default Re: Hex Nut Markings

    There are thousands of head marking's. Here is a very small 162 page listing of some of the different manufacturers head marking's. This list only covers some of the ones you might run across. http://www.dot.state.il.us/materials...ationguide.pdf

    The triangle is found on Vermont manufacturing bolts and nuts. They normally use a single triangle though. Could be thiers though.

  7. #7
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    Default Re: Hex Nut Markings

    Those are BOLT markings and I can find all kinds of them in great detail. However none of the charts you show have NUT markings. Nut markings seem to be some great secret. I believe that the two triangles mean self locking but I can not find anything that verifies that. This site here is one of the better ones and has the slash marks but not the triangles.
    American Fastener - ASTM, SAE, and ISO Grade Markings

    The reasonI was asking was because they are on the lug nuts that came on my new horse trailer. But they seem to be the wrong size or they have some sort of self locking on them. They will not just screw on and off like a normal lug nut does. You have to use a wrench all they way on and off. It is either that or the factory put 17mm nuts on a 1/2 in lug. This is kinda what I suspect also. Because when I take a regular 1/2 X 20 lug I can just screw it on with my fingers.

  8. #8
    Gold Member jwnge's Avatar
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    Default Re: Hex Nut Markings

    If I remember correctly,Those have a interrupted fit, a slight squeeze or miss fit to not let them fall off if they come loose, kind of like a lock nut but not as much so, just a safety factor. John
    If ya don't do it when ya get to it, ya may never get to it to do it again

  9. #9
    Elite Member DieselPower's Avatar
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    Default Re: Hex Nut Markings

    Quote Originally Posted by Jimbrown
    Those are BOLT markings and I can find all kinds of them in great detail. However none of the charts you show have NUT markings. Nut markings seem to be some great secret. I believe that the two triangles mean self locking but I can not find anything that verifies that. This site here is one of the better ones and has the slash marks but not the triangles.
    American Fastener - ASTM, SAE, and ISO Grade Markings

    The reasonI was asking was because they are on the lug nuts that came on my new horse trailer. But they seem to be the wrong size or they have some sort of self locking on them. They will not just screw on and off like a normal lug nut does. You have to use a wrench all they way on and off. It is either that or the factory put 17mm nuts on a 1/2 in lug. This is kinda what I suspect also. Because when I take a regular 1/2 X 20 lug I can just screw it on with my fingers.
    Did you actually look at the IL state PDF link? It has hundreds if not a thousand NUT marking's. They start on page 82 and continue to page 162.

    You can also check the US Patent Office Fastener Insignias Register. http://www.uspto.gov/web/offices/tac/fqa/active.pdf

  10. #10
    Veteran Member gordon21's Avatar
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    Default Re: Hex Nut Markings

    A new horse trailer?? I would be going back to the dealer ASAP and demanding an explanation. Neither he nor the mfgr will want to honor a claim for new hubs in 3 years when you claim it was screwed up from day one. Look at another trailer on his lot to see if the nuts are the same and try to take one off. Lug nuts are kinda important when doing 70MPH with a couple horses in the back.......
    Lewis Gordon

    JD 790, 300 FEL, 5' KK rotary mower, 5' boxscraper, Huskee 3PT logsplitter, JD#39N sickle mower and a Jinma 6" chipper in JD colors.

    My XUV gas Gator wants a brother !!!!!!!! (the diesel kind)

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