bolt grade?
I'm going to replace the ring gear bolts at the ARB locker.
Knowing that they have to be replaced everytime when loosened, I would like to know which grade they are. Nobody is able to tell me the bolt grade over here in our world of metric. The bolt is a 3/8, 24G and has 7 protruding lines on it. One picture tells more than 1000 words: Thanks for your help! What would be the best bolt to replace it? http://up.picr.de/4656394.jpg |
wow.. thats the same way mine were.. marked really odd. it conforms to no spec I can find.
what is the torque spec? I would select a suitable grade according to that. edit: it's most likely not a standard steel bolt, hence the odd markings |
Seen lots of bolts - but none ever like that.
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That is a grade 7 sae bolt
usualy metrics have a # stamped in the head 4,5,6,7,8, and so on with no marks this is the best I can remember |
grade 7 has 5 lines, grade 8 has 6
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ARB asks for a torque of 75Nm or 55ftlb.
As a metric bolt that would be a 10mm, 10.9 bolt with a torque about 79Nm. Thats not an ultimate bolt for a ring gear application...:nope: |
10.9 is a hair weaker than grade 8...
you would probably be ok with that grade.. but I have a feeling that ring gear bolts are made with a really high tensile strength.. if I remember right mine torqued into the 200ftlb range. It might just be best to order a set to have piece of mind.. |
Hmm, seems like another job for ARP bolts?
I don't won't these bolts to fail.:nope: |
ARP might just be overkill.. but i'm pretty sure they make them for a hefty price.
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...of course you can re-use the old ones and not using Loctite- like the TJ Jeeper with the self installed locker, I met on the trail with a grenaded rear end.
Four or five bolts were fallen out, the rest was sheared off. I'm normally really not the person to find joy in another's misfortune- but in this case I laughed my butt off, because we told him in advance... |
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