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mmt

Which Grade Steel

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mmt

Hi guys

Which grade steel is reccomendable for bolts for the wishbones? 8.8 or 12.9?

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dcc

Iirc they arent overly tight, and i think mine were 10.9 - i wouldnt go as low as 8.8

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mmt

I was actually thinking of going lower in order for the bolts to snap in case of impact rather than tough bolts bending rather than breaking of?

Race only

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Kane

Higher grade material is more brittle so more susceptible to shearing than bending in a heavy impact.

 

It may be worthwhile considering sacrificial brackets instead as the material strength is potentially lower if mild steel.

Edited by Kane

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welshpug

I'd imagine the lower balljoint to break or the arm to bend, or the subframe itself, before the inner bolts do

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jackherer

That's correct, I've got a wishbone that is bent like a banana following a crash but the bolts and the balljoint were fine.

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Biggles

I've got one of those too !

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