tensil rating?

[gopen]

hi
whilst drseg was doing my brake rod conversion for me(provided he didnt have too much beer last sunday), i thought i would give it a go myself, but every shop i went they could not tell me what the tensil rating was for the bolts they were selling me. the guy at screw fix showed me some bolts that were M12 strength. are they tensil rating 12? if not what should i look for M wise?

he thinks M12 = tensil rating 12 is he correct?


i never thought finding a bolt would be such a hassle.

drseg, as you could see from above, my geep moving anywhere, in the foreseeable future is totally in your hands. so please keep away from the beer cans for the time being LOL.

on a serious note, could you e mail me the estimate cost of the conversion? so that i can send you a postal order? i would also need your name and address.

thnks
gopen

[Dave the Steam]

Hi,

M12 will be the size. Look for some other characters embossed on the head 8.8 is a typical one, S grade (don't know what the marking is) is better.

if there's no other characters then don't use it, it's probably mild steel and no good.

TTFN

[drseg]

its done using aircraft qualituy socket headed screw decided if i filed rod down ot would fit snug inside socket head and sit straight and true
send me your address by email i'll post it you
refund me the postage and send me a drink for my trouble if it works ok if not send it back and i'll change it oh and if it works send me your redundant rod and i can do someone elses

tensile strength will be a figure on head of bolt will physically say for instance 8.8

>> Edited by drseg on Thursday 21st July 20:11

[dave36]

I did the mod on mine and used (perhaps incorrectly) standard engineering grade m8 nut n bolt welded to pushrod, which if my memory serves me right is a 5/16 bright mild steel shaft.
so if properly welded should be ok as the shaft is in compression - TENSILE strength not so important.
and yes the jeep normally stops as well as any bog standard servo assisted small car

[gopen]

thanks drseg
i have e mailed my details to you. cant wait to try the new one out, hopefully it would fit nicely.

gopen

[driftwood]

high tensile bolts...reminds me of my Vanning days back in the 70's. The story went around on how someone fixed some nice new shiny wide wheels on a fellow 'mates' van....'course I can make you some bolts up. Pity he didn't use h/tensile steel.....wheel worked loose at high speed....off came the wheel, wheel arch, bodykit,ripped out some of the interior........seemed so much more fun in the good old days

[gopen]

surely, the name drift--wood did not come from this incident?

[Mister frosty]

Just a little extra info on tensile strength.

As you will be aware now the tensile strength of extension to your brake pushrod is not as important as in some instances.

8.8 is the same tensile strength as 'S' grade. 'R' grade is slightly lower in tensile strength - so not of great use on most cars. Socket head set screws/bolts are usually higher tensile strength being 10.9 or even 12.9. All of these variations are clearly marked, as stated by others on this thread, on the head of the bolt/set screw. Bear in mind that going for the highest tensile strength bolt for all jobs on your car is not a good idea. While tensile strength increases shear strength decreases. Use the bolt grade recommended by car/kit manufacturers to be safe.

Finally, the following link pasted in your favourites will be a usefull bolt reference:

www.namrick.co.uk

Its a bolt suppliers catalogue with some basic spec info at the back.

Hope this is of some further use to someone.

[swizz...club sec]

Thanks Frosty thats a handy site.
Swizz...