Thanks Thanks:  0
Likes Likes:  0
Needs Pictures Needs Pictures:  0
Picture(s) thanks Picture(s) thanks:  0
Results 1 to 11 of 11

Thread: Bolt Markings

  1. #1
    Join Date
    Dec 2004
    Location
    Northen Rivers NSW
    Age
    55
    Posts
    131

    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


  2. #2
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
    6,067

    Default

    8.8 is the grade

    It goes..

    4.6
    8.8
    10.9
    and 12.9
    Gold, the colour of choice for the discerning person.

  3. #3
    Join Date
    Oct 2010
    Location
    melbourne, laverton
    Posts
    1,901

    Default

    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

  4. #4
    Join Date
    Nov 2006
    Location
    Bendigo Victoria
    Age
    77
    Posts
    7,471

  5. #5
    Join Date
    Mar 2009
    Location
    Blue Mountains
    Posts
    193

    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.

  6. #6
    Dave J Guest

    Default

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

    Dave

  7. #7
    Join Date
    Dec 2004
    Location
    Northen Rivers NSW
    Age
    55
    Posts
    131

    Default

    Thanks all!

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


  8. #8
    Join Date
    Oct 2007
    Location
    Sydney
    Posts
    3,112

    Default

    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

  9. #9
    Join Date
    Apr 2009
    Location
    Kingswood
    Posts
    833

    Default

    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.

  10. #10
    Join Date
    Nov 2007
    Location
    melbourne australia
    Posts
    2,830

    Default

    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

  11. #11
    Join Date
    Apr 2008
    Location
    Canberra
    Posts
    795

    Default

    Ha ha..paragraph i) is a beauty!

Similar Threads

  1. Bending a bolt
    By Tiger in forum METALWORK GENERAL
    Replies: 3
    Last Post: 24th Apr 2008, 01:34 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •