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Thread: Bolt Markings
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23rd Sep 2011, 07:33 PM #1
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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23rd Sep 2011, 08:27 PM #2Pink 10EE owner
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8.8 is the grade
It goes..
4.6
8.8
10.9
and 12.9Gold, the colour of choice for the discerning person.
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23rd Sep 2011, 08:28 PM #3Most Valued Member
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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
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23rd Sep 2011, 08:40 PM #4
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24th Sep 2011, 02:17 PM #5Senior Member
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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.
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24th Sep 2011, 02:50 PM #6Dave J Guest
Mn,
Totally agree, I guess he doesn't like the US.
Dave
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24th Sep 2011, 04:29 PM #7
Thanks all!
B, D2 and M just got thrown at the neighbours cat....bullseye
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25th Sep 2011, 08:37 AM #8Most Valued Member
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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
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25th Sep 2011, 10:59 AM #9Golden Member
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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.
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25th Sep 2011, 07:53 PM #10Most Valued Member
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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
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29th Sep 2011, 04:52 PM #11Golden Member
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Ha ha..paragraph i) is a beauty!
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