For the Mech Engs: Max load of an A4 Stainless nut and bolt

[PhilDawson8270]

I needed some bolts quickly for a longboard. The only ones I could get hold of were A4 Stainless Steel M5. I know the are not intended for load bearing applications, but my maths appear to say they will be fine. They are not marked regarding whether they are m5-50/70/80. So I am being safe and assuming they are A4-50.

Which means they have a tensile strength of 500MPa and a 0.2% Proof of 210MPa. I found that the stress area is 14.2mm2, so then the max force at yield is 2982N which is around 300KG ish.

This seems high for a stainless m5 bolt, but my maths seem correct. So I guess, the question is, am I correct?

Help me not die on a hill

 

[Crackle]

As a qualified Beng mechanical Engineer I can say with some confidence ............. They'll probably be OK. What's the worst that can happen?

 

[nickyboy]

I doubt these dudes are worried about megaPingu's or whatever they are


View: https://www.youtube.com/watch?v=ATWOLWLNrhA

 

[Oxo]

BOOM

It could be twice as bad BOOM BOOM.

 

[Supersuperleeds]

It could be twice as bad BOOM BOOM.

 

[Bariton]

You could always stick a few self tapping screws in for good measure, then wrap it in gaffer tape!

Ok, I'm outa here!

 

[PhilDawson8270]

I doubt these dudes are worried about megaPingu's or whatever they are


View: https://www.youtube.com/watch?v=ATWOLWLNrhA

I'm a worrier

 

[swee'pea99]

You could always stick a few self tapping screws in for good measure, then wrap it in gaffer tape!

Ok, I'm outa here!

Or there are some awfully good glues these days I hear.

 

[twentysix by twentyfive]

[QUOTE 4492255, member: 9609"]M5s are very micky mouse, drill the hole out and use an M10, i doubt you could shear one of those on a long board[/QUOTE]
The bigger the better