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bolts..
Posted: Tue May 19, 2015 11:04 pm
by JJMclure
Regarding lower arm to chassis bolts, can I safely use grade 8.8 or would I be better going higher? I need some 1/2" bolts and found some ARP ones that have an advertised yield strength of 170,000psi which I made to be 1172 MPa, a quick search shows as being slightly higher than grade 12.9. I have only searched on the dreaded online flea market so must admit I haven't explored all avenues yet but want to get the correct ones for the job. Your advice gentlemen?
Posted: Wed May 20, 2015 12:04 pm
by stevieturbo
Pic of setup ?
10.9 or 12.9 should be readily available anyway ?
Cant imagine there ever would be any need to go to ARP for basic bolts
Posted: Wed May 20, 2015 10:54 pm
by JJMclure
here we go plz ignore the shoddy painting and surface rust
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do you know of any on line suppliers?
Posted: Wed May 20, 2015 11:20 pm
by stevieturbo
Almost unlimited suppliers on ebay.
Almost all cap screws, ie allen key type bolts are high tensile 10.9 or 12.9
Generally with imperial bolts though, ie 1/2" etc they use a different numbering system for high tensile.
Given size of bolt I'd have little concern about even an 8.8 though
My lower suspension arms have 4" long 1/2" bolts for the main fixing along with spacers to accommodate the rose joint and never had any issues.
Likewise the top bolt where the coilover secures to in a similar fashion.
I did not use cap screws, both of these would be a very high load application.
Posted: Thu May 21, 2015 7:59 am
by JJMclure
I did wonder about cap screws, nice one thanks for your help Stevieturbo