ARP 8740 cromoly bolts vs 12.9

[hardsteppa]

So, on the new car, OEM has used heaps of 12.9 grade TTY bolts on the brakes and mounting, suspension mountings, bearing hubs etc,with the workshop manual saying they're all single use only, being TTY. I say fk throwing away and buying new bolts everytime I want to work on something, so am considering replacing them with ARP bolts. Their 8740 cromoly yield spec seems to exceed 12.9 grade bolts - anyone with any thoughts on using ARP instead?

[Duncan]

Yeah interesting approach. Even the 32R workshop manual says not to re-use a lot of hardware  I'm not a believer, I only replace head and rod bolts, other stuff just gets torqued to spec.

[hardsteppa]

Thanks Duncan, yes I have just reused the original bolts with blue Loctite on them. No issues with doing this so far, and I'm hard-pressed believing the 12.9 bolts will snap, more likely to mayyybe come loose...which loctite should prevent. I'm still thinking of the ARP's though, especially for the 4x rear hub bolts, carrying the vertical load of the car.

[hardsteppa]

ended up going with bolts from this seller, as a much cheaper option https://www.ebay.com.au/str/thefastenerwarehouse