chesney321
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| posted on 30/12/10 at 10:47 PM |
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bolt sizes
could anyone please tell me how to work out bolt sizes for when i need to buy replacement nuts and bolts.ive always known bolts by the size of the
spanner you use..i.e. 13mm 10mm ect..ect when it comes to buying replacement they say m6 m8 m10,could someone please convert these common size bolts
for me..
8mm
10mm
13mm
17mm
19mm
i have looked for conversion charts but havent found any yet...many thanks ....dave
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daviep
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| posted on 30/12/10 at 10:50 PM |
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quote:
Originally posted by chesney321
could anyone please tell me how to work out bolt sizes for when i need to buy replacement nuts and bolts.ive always known bolts by the size of the
spanner you use..i.e. 13mm 10mm ect..ect when it comes to buying replacement they say m6 m8 m10,could someone please convert these common size bolts
for me..
8mm spanner = 5mm thread
10mm spanner = 6mm thread
13mm spanner = 8m thread
17mm spanner= 10mm thread
19mm spanner= 12mm thread
i have looked for conversion charts but havent found any yet...many thanks ....dave
Davie
edited for clarity
[Edited on 30/12/10 by daviep]
“A truly great library contains something in it to offend everyone.”
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blakep82
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| posted on 30/12/10 at 10:51 PM |
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M6 is a 6mm diameter thread
M8 is a 8mm diameter thread
M10, well you get the idea.
if you are replacing them, just measure the thread with a caliper gauge 
________________________
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don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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chesney321
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| posted on 30/12/10 at 10:56 PM |
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that was quick.many thanks for all of your help
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cliftyhanger
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| posted on 30/12/10 at 10:56 PM |
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but be careful, some bolts do not follow the rules. Ford use some funny (but I like them) heads which are smaller than you would expect....(13mm
spanner for M10 bolt etc)
BUT 99% of the time the chart above is spot on.
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daviep
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| posted on 30/12/10 at 11:16 PM |
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quote:
Originally posted by cliftyhanger
but be careful, some bolts do not follow the rules. Ford use some funny (but I like them) heads which are smaller than you would expect....(13mm
spanner for M10 bolt etc)
BUT 99% of the time the chart above is spot on.
Why would you like bolts with a smaller than standard head?
They are the worst idea ever, once they get old and rotten and seized you have even less head to get a grip on and a much better chance of rounding
the corners off?
“A truly great library contains something in it to offend everyone.”
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cliftyhanger
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| posted on 30/12/10 at 11:42 PM |
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Ah, you have not used them 
They are fantastic for tight areas. In fact, it seems the manufacturors are using more and more of this type of thing, splined head bolts have
relatively small heads, certainly smaller than conventional bolts.
In fact the oe stuff is also excellent quality, it seems much better than the 8.8 stuff I buy when getting new bolts (namricks local to me) plus these
days seized stuff is getting rare, except when I take bolts that were last done up 45 years ago. Anything I do is coppergreased. 15 years of everday
use, plus left on the driveway for another few years, still undoes with no swearing.
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RazMan
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| posted on 31/12/10 at 01:48 AM |
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Yep, the flanged nuts & bolts that a lot of Jap manufacturers use are quite neat for cosmetic applications as they stop the socket from scratching
the metal. I tend to go for these when getting stainless fixings in visible locations.
[Edited on 31-12-10 by RazMan]
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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daviep
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| posted on 31/12/10 at 08:55 AM |
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quote:
Originally posted by cliftyhanger
Ah, you have not used them
They are fantastic for tight areas. In fact, it seems the manufacturors are using more and more of this type of thing, splined head bolts have
relatively small heads, certainly smaller than conventional bolts.
In fact the oe stuff is also excellent quality, it seems much better than the 8.8 stuff I buy when getting new bolts (namricks local to me) plus these
days seized stuff is getting rare, except when I take bolts that were last done up 45 years ago. Anything I do is coppergreased. 15 years of everday
use, plus left on the driveway for another few years, still undoes with no swearing.
Yes I have encountered them frequently, hence my dislike. I work on offshore equipment, think salt water, think corrosion worse than you can
imagine.
You've probably never worked on real machinery
“A truly great library contains something in it to offend everyone.”
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cliftyhanger
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| posted on 31/12/10 at 04:38 PM |
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quote:
Originally posted by daviep
Yes I have encountered them frequently, hence my dislike. I work on offshore equipment, think salt water, think corrosion worse than you can
imagine.
You've probably never worked on real machinery
I leave the "agricultural" and "heavy engineering" stuff to others who are so suited. I prefer working on my driveway and
doing it for fun
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