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Head Bolts
Posted: Thu Apr 21, 2011 8:55 am
by 500bernie
A technical question for all of you mechanical geniuses out there....
If I wanted to replace the head bolts with a stainless steel replacement
, what grade/specification stainless steel would they need to be made of to match/exceed the specification of the standard high tensile steel bolts?
Cheers,
Bernie
Posted: Thu Apr 21, 2011 4:12 pm
by SP_BOTT
As far as I know, no stainless is going to be as 'hard' as high tensile, standard 'over the counter' stainless fittings are A2 and the harderr versions is A4 (stamped on the bolt heads) both these are softer than 8.8 high tensile, (ie your head bolts) and Allen bolts are higher still, at 12.9 hardness.
I'm no expert, just what I'm lead to believe.
Bit boring, but shows a few examples
http://autonopedia.org/crafts_and_techn ... kings.html
Posted: Sat Apr 23, 2011 1:38 am
by 500bernie
Thanks for the info....
Black high tensile it is then!
Cheers
Bernie
Posted: Sun Apr 24, 2011 8:21 am
by scooble
my bike is currently down the machine shop, therefore can anyone tell me what the dimensions are for the standard head bolts so I can find alternate replacements
Posted: Sun Apr 24, 2011 8:46 pm
by 500bernie
Hi Scooble,
8x40
Cheers,
Bernie
Posted: Tue Apr 26, 2011 5:22 pm
by scooble
is that M8 1.25 or M8 1.5?
Posted: Tue Apr 26, 2011 5:33 pm
by Tel
On the subject of thread sizes/pitches, is there a list of bolt thread pitch sizes anywhere?
Tel
Posted: Tue Apr 26, 2011 10:55 pm
by JanBros
standard M8 scooble, so it's 1.25
