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Thread: Bolt Markings

  1. 23rd September 2011, 07:33 PM #1
    dazzler's Avatar
    dazzler
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    Default Bolt Markings

    Hi all

    I have a left of field question.

    Does anyone know what these markings on the head of a bolt mean.

    IE strength etc.

    It is a metric thread (M12) 100mm long and is bright coloured (I would normally call it zinc)

    It has the following markings
    B

    D2

    M or a W

    cheers

    The other bolt is shorter, black and has an 'x' and 8.8 which I take is a metric high tensile.

    Cheers

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  3. 23rd September 2011, 08:27 PM #2
    .RC.
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    8.8 is the grade

    It goes..

    4.6
    8.8
    10.9
    and 12.9
    Light red, the colour of choice for the discerning man.
  4. 23rd September 2011, 08:28 PM #3
    azzrock
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    the 8.8 does mean high tensile.not shore what the other marking are probably a brand. i think its safe to say that bolt is not high tensile
  5. 23rd September 2011, 08:40 PM #4
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    See table 10 in this link for tensile markings

    Metric Bolt Properties, Grades, and Strength
  6. 24th September 2011, 02:17 PM #5
    Metalman
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    Talking

    Big Shed,
    Whilst I don't disagree with the writers sentiments in your reference, the last few sentences in paragraph 'i' are a bit out of place in a technical article.
    Mm.
  7. 24th September 2011, 02:50 PM #6
    Dave J Guest

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    Mn,
    Totally agree, I guess he doesn't like the US.

    Dave
  8. 24th September 2011, 04:29 PM #7
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    dazzler
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    Thanks all!

    B, D2 and M just got thrown at the neighbours cat....bullseye

  9. 25th September 2011, 08:37 AM #8
    Pete F
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    Quote Originally Posted by Metalman View Post
    Big Shed,
    Whilst I don't disagree with the writers sentiments in your reference, the last few sentences in paragraph 'i' are a bit out of place in a technical article.
    Mm.
    Given the references he uses I believe he is an American, and there are a lot of US citizens basically smacking their foreheads with their hands as to what's going on with their country. Obviously there's more to it than just their collective reluctance to accept and embrace global change instead of dictating it, but it's certainly frustrating and I guess this is just an opportunity to vent.

    For bolt head identification, once again, The Engineer's Black Book is a very handy reference and shows the various markings.

    Pete
  10. 25th September 2011, 10:59 AM #9
    electrosteam
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    US Metric,
    Metric design was specified on a elevated/subway passenger railroad contract for Philadelphia that I worked on in New York (upstate) 1993 - 1998.

    The car structure and bogie design were done in Dandenong, all car bodies and about 14 complete bogies were manufactured in Dandenong.
    The US factory did the rest.
    I drove the elevated/subway operator crazy when I investigated their cross-sectional car clearance diagram to determine just where the 3rd rail collector should be positioned.
    They had no drawings, so I commissioned a metric one for them and presented it for approval.

    The US design office was interesting, the CAD guys persisted with US dimensions (decimal inches, not imperial fractions) being added to the drawings.

    I believe metric dimensions were referenced in some way in the US Constitution.

    John.
  11. 25th September 2011, 07:53 PM #10
    jack620
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    What happens when you get your metrics and imperials mixed up:

    Gimli Glider - Wikipedia, the free encyclopedia

    and:

    http://articles.cnn.com/1999-09-30/t...tem?_s=PM:TECH
  12. 29th September 2011, 04:52 PM #11
    19brendan81
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    Ha ha..paragraph i) is a beauty!
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