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recovery bolts Q

General Tech Talk

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recovery bolts Q

Post by hill billy »

hey peps, i bought a recovery point a few months ago and just making sure the bolts are half decent, there is writing on the head of the bolts that say a4 70 can anyone make sence of this
Cheers :D
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Post by HotFourOk »

I found this...
Generally these are produced from grade 304 (A2), grade 316 (A4) or for less demanding applications,grade 303 (A1). Grade classifications A1, A2 and A4 are in accordance with International Standard ISO 3506; head markings often show this classification.
http://www.assda.asn.au/asp/index.asp?pgid=18732



And here http://home.jtan.com/~joe/KIAT/kiat_2.htm
shows how an A4-80 is nearly the same as a grade 8 bolt in strength. Not sure about A4-70? though

If in doubt, go buy some metric rated bolts and nuts :D
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Post by sudso »

Just use bolts that have 8.8 on the head. They are the high tensile ones.

Those others mentioned are stainless steel bolts
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Post by ISUZUROVER »

If they are A4 - then they are stainless, which you DO NOT want to use. Buy some class 8.8 or 10.9 bolts and use them (or Grade 8 if imperial - 6 equidistant radial lines on the head).
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Post by Micka »

MAKE SURE YOU USE HIGH TENSILE BOLTS :!: :!:

Safety is not optional when it comes to securing tow points, bull bars, tow bars and anything else that looks too good to not attatch a strap to.

As said... 8.8 would be the minimum to use.


Micka
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Post by hill billy »

Micka wrote:MAKE SURE YOU USE HIGH TENSILE BOLTS :!: :!:

Safety is not optional when it comes to securing tow points, bull bars, tow bars and anything else that looks too good to not attatch a strap to.

As said... 8.8 would be the minimum to use.


Micka
thats why i asked, thatnks for that guys
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Post by Gribble »

At least 2 M12 gd 8.8 are an absouloute minumum for recovery points.
\m/
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