On 15 December 2012 14:39, Andrew <[email protected]> wrote:

> Let the ultimate strength be 250/mm2

I wasn't planning on using cheese :-)

Hex-head bolts are normally at least grade 8.8, so 600MPa proof and 800MPa UTS.
http://www.engineeringtoolbox.com/steel-bolts-metric-grades-d_1428.html

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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