A4 M5 nut and bolt, maximum load

[lihp]

I needed some bolts quickly. The only ones I could get hold of in correct size and head 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.

8 bolts are used, and has a maximum load of 100kg.

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?
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[CaNsA]

Will the stress be equal across all bolts?

[lihp]

[CaNsA]

It's a pretty important factor to consider.

What will they be used on?

[smegballs]

What direction are they loaded in? In tension thin bits of steel can be surprisingly strong, even though they will easily bend if subjected to side loads.

I reckon they will probs be okay. I weigh about 100kg and can imagine that the 8 bolts could probably take my weight on a dead hang.

What gets damaged/dies if bolts fail?

[Kickstart]

Hi

In a carefully loaded straight tension load I suspect a single M5 would take my weight, but putting on a bending force or sudden load would be very different.

All the best

Katy
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[Pete.]

8No M5 a4's are way more than capable of hanging 100kg, but make sure you only torque them to about 4 foot pounds.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[lihp]

[lihp]

[lihp]

[skatefreak]

WTF is this for?
Am very curious...