Suitable Metal Grade for Seat Bolts.

[Ollie82.]

Mr Ben P has recommended 12.9 grade 50mm M8 Cap bolts to bolt my soon to be delivered Cobra subframes into the car.

Been looking on Fleabay and there are lots of M8 Cap bolts but no real sign of 12.9 grade...what i am finding is A2 - Grade 304.
Is this anywhere near to the same grade?

Any help would be great!

Cheers!

 

[Dcds4]

12.9 is the hardness of the bolt thats all, go to your local bolts and fastenings shop and they'll hadve everything you'll need

 

[Gumby]

It's amazing how unwilling people are to go to the local shops nowadays

 

[Ollie82.]

It's amazing how unwilling people are to go to the local shops nowadays

Untrue! Im more keen to go to a store and buy the number of bolts and nuts i need instead of having to bulk buy a box of 60!

Only problem is im not really sure where the hell my local "nuts and bolts" store is...
Can you really pick these up from B&Q??!

 

[Fred@BTM]

trident racing supplies silverstone

12.9 isn't the "hardness" of the bolt at all, its the tensile strength i believe! (use the OE nuts though)

 

[Ollie82.]

I was thinking i might just collar the Wurth rep at work on Monday, but thanks for the tip Fred.

So use the original nuts? Would some M8 nylock jobbies do the job if im buying new bolts?

 

[ben_p]

oillie

il send you a kit mate, i have guy who makes all my bolts, ive got your address from the mounts.

when you need them?

 

[Fred@BTM]

no, the original nuts are designed for purpose, normal nuts and washers would do feck all in a crash

 

[ben_p]

behave!

12.9 and hardend steel but with 18mm washers!

 

[ben_p]

but i can get the ones that fit the oe nuts, in 12.9 cap

 

[Fred@BTM]

ben, remind me what you do for a living?

 

[Gray]

ben, remind me what you do for a living?

Rent boy? :rasp:

 

[Fred@BTM]

^no, worse than that i believe!

 

[Ollie82.]

oillie

il send you a kit mate, i have guy who makes all my bolts, ive got your address from the mounts.

when you need them?

PM sent Ben! :approve:

 

[ben_p]

ben, remind me what you do for a living?

esate agency, property, tuning company

 

[racingred27]

I would have thought 12.9 is overkill, go for some 8.8 bzp much cheaper and readily available

 

[ben_p]

automotive recomended min is 10.9 for saftey fixings. for the extra £2 its worth it to get 12.9

 

[geesus69]

mine are 10.9 iirc cap bolts, only m6 though as thats the size the holes are drilled to on the subframe from omp, didnt really want to start drilling bigger holes but now not sure if i should have?

on another note the mk1's original fixings are only m6, so must be ok?

 

[ben_p]

yea IMO m6 is way too small. but im just a softy.

if it were me.... i would drill out to m8,

 

[paul]

ive searched and searched for these and im hoping cobra are going to send me the correct thing free! and i seem to find that bloody fasterners/eng supplies companys only open monday - friday

 

[Fred@BTM]

ben, remind me what you do for a living?

esate agency, property, tuning company

any motorsport qualifications to back up your expert comments?

 

[ben_p]

if BenR does without, i'll manage

 

[Fred@BTM]

his daddy owned Toms Toyota Racing though

 

[ben_p]

s**t LOL... erm ... will a lump of cash sort this techy hickup?

 

[Fred@BTM]

no chance LOL! PMSL!!

 

[Ex-User (19928)]

lol

 

[ben_p]

 

[ben_p]

il hide behind ben then. and maybe answer the phone