thanx for the answer.
0.6 seems to be good for practical use.
unfortunately, i need to get the exact value for an M20 shaft screw,
with a shaft diameter of 21mm.
googling around, i wasn't able to get any info on something like that!
tino

************************************************************************
******************************


>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>On Behalf Of Michael Rigby-Jones
>Sent: Monday, January 30, 2006 12:55 PM
>To: Microcontroller discussion list - Public.
>Subject: RE: [OT]: Mechanical Strength of a Bolt
>
>
>
>
>>-----Original Message-----
>>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]
>>Sent: 30 January 2006 11:33
>>To: Microcontroller discussion list - Public.
>>Subject: [OT]: Mechanical Strength of a Bolt
>>
>>
>>I need to know the strength of a bolt.
>>
>>It is rated 10.9, so i think it's strength is 1000N/mm2 when
>>pulling it.
>>
>>If i use this bolt to join 2 elements, which try to shift
>>against each other, how do i calculate the maximum force it can stand?
>>
>>      ^
>>      |  F
>>      |
>>     111
>>     111
>>     111222
>>     111222
>>     111222
>> BBBBBBBBBBBBBBB
>> BBBBBBBBBBBBBBB
>>     111222
>>     111222
>>     111222
>>        222
>>        222
>>        222
>>         |
>>         |  F
>>         V
>>
>>B = bolt
>>1 = element 1 pulling up
>>2 = element 2 pulling down
>>F = maximum shearing foce it can stand
>>
>>thanx!
>>tino
>
>A quick google reveals that a rule of thumb is that shear 
>strength = 0.6 * tensile strength.  Note that in most 
>assemblies, the plates will be clamped together and (at least 
>some) shear stress will be taken by the friction between the plates.
>
>Regards
>
>Mike
>
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