bolts..
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bolts..
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?
don't nibble on the barrel, pull the trigger!
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- Forum Contributor
- Posts: 3979
- Joined: Sat Nov 18, 2006 6:22 pm
- Location: Northern Ireland
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.
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.