so, this is probably a very large topic, and I probably should just buy a book, in which case, recommend me a book!

but we have metric bolts, which have different tensile "strengths"? which are then graded by letters? which are stamped on the head of the bolt.

and we have imperial sizes, with the same idea i guess.

to top it off we have different thread widths, and I believe I am right in thinking if you cross reference the thread width with the thread diameter, we have a table of torques in n/m or lb/ft which Mrwibble can use as a guide to torquing up the suspension bolts on his car.

so in summary,

what do the symbols on the heads of the bolts mean. and does anyone have a good link to a table of torque values for both metric and imperial fixings commonly found in automotive use.

ta.

someone posted a link to great site on here a few years ago which went through all this. just looking for it now.

Think it might have been this one

tables of bolt torques, stamping codes, etc.....

HTH


Vince

B&Q fastenings have no place on a car, use 8.8 as a standard and you will not go far wrong.

Column 2, 5 from bottom.

http://www.shedworks.eu/tips.html

If you want a good book (bit American) that goes into the theory of fasteners then you could do worse than this:

Linky

aka "Screw to Win" based on the other books he's written.

quote:

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Originally posted by iank
If you want a good book (bit American) that goes into the theory of fasteners then you could do worse than this:

Linky

aka "Screw to Win" based on the other books he's written.

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many thanks.