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Local (S.F. / north bay) place to buy M8x20mm rotor bolts?

JMardy

JMardy

More head - less ass
Joined
Oct 1, 2006
Location
San Rafael
Moto(s)
Ducatis, Hondas, Bimota, Aprilia, Triumph and a Husky
Name
Haywood
I need some for a set of track day wheels and may not have time to have them shipped. Any ideas?
 
i have 2 diff types but more important i only have 7 of both types and i know thats not enough. one type has a shoulder the other one threaded no shoulder.
 
Thanks Sal.
More specifically, I need 18 flanged hex-head bolts:
8152286.jpg
 
Last edited:
you sure that's all you need?
order from mcmaster carr before 2 or so, they should be at your place tomorrow evening
 
Oh yeah. I always forget about those guys.
Ordering now.
Thanks!
 
I have an entire mixed bag of 8x25's, allen heads, hex heads, button allen heads so if you don't mind the odd ball setup mixture your welcome to them.
 
Thanks Sal. I just ordered a pack of 50 for ten bucks!
What an kick-ass website too. So fast to find what you're looking for. Bookmarked.

Too bad no metric titanium. :D
 
Be ABSOLUTELY sure that the bolts you get are the same or better grade as the original. Otherwise you risk failure and possible injury or death if you use inferior grade fasteners.
 
ST Guy said:
Be ABSOLUTELY sure that the bolts you get are the same or better grade as the original. Otherwise you risk failure and possible injury or death if you use inferior grade fasteners.
Click to expand...


YES ! ! !

DO

NOT

GET THESE AT THE HW store

have you tried Hattar?
 
They are grade 10.9.
Can't find specs on the OE Aprilia bolts. Here's the McM-Carr bolt specs:

Nonmarring flanged screws are fully threaded unless noted and have a Class 6g thread fit. Made from Class 10.9 steel with a black-phosphate finish, they have a minimum tensile strength of 150,000 psi. Head height includes the thickness of the flange. Screw length is measured from under the head.
 
i'd be more concerned with the geometry of the fastener, as the ones i've seen are shoulder bolts. aprilia might do it different, i have no frame of reference
 
Aprilia use the bolt in post 3 above. Plain old flanged bolt as far as I can tell.
Thanks for the help.
 
Re: grade, I still can't find OEM specs but there is this comment on the AF-1 site:

"This M8X20 bolt is also used on other Aprilia models in chassis and bodywork applications."

Given that, I can't imagine they would be using grade 12.9 or higher bolts, so I feel pretty good going with the grade 10.9's.

Saul, ST? What say you?
 
JMardy said:
Re: grade, I still can't find OEM specs but there is this comment on the AF-1 site:

"This M8X20 bolt is also used on other Aprilia models in chassis and bodywork applications."

Given that, I can't imagine they would be using grade 12.9 or higher bolts, so I feel pretty good going with the grade 10.9's.

Saul, ST? What say you?
Click to expand...

hell grade 8's are most likely enough so feel good about the 10.9's.
 
JMardy said:
Re: grade, I still can't find OEM specs but there is this comment on the AF-1 site:

"This M8X20 bolt is also used on other Aprilia models in chassis and bodywork applications."

Given that, I can't imagine they would be using grade 12.9 or higher bolts, so I feel pretty good going with the grade 10.9's.

Saul, ST? What say you?
Click to expand...

if indeed it's the exact same part number in both locations. then no worries... probably. 8mmx20 really only tells part of the story. it's equally plausible that, instead of using a weak bolt for holding on rotors they're using a really fucking strong bolt to hold on fairings, because at that point it's a parts count game. reducing parts count reduces production cost and inventory, and the cost difference between two essentially garden variety bolts is tiny in comparison

motobecane10 said:
hell grade 8's are most likely enough so feel good about the 10.9's.
Click to expand...

"grade 8" and 10.9 are different and unrelated systems for specifying a bolt. just so happens, they're roughly equivalent.

page 14 and 15 are of interest here
 
auntiebling said:
if indeed it's the exact same part number in both locations. then no worries... probably. 8mmx20 really only tells part of the story. it's equally plausible that, instead of using a weak bolt for holding on rotors they're using a really fucking strong bolt to hold on fairings, because at that point it's a parts count game. reducing parts count reduces production cost and inventory, and the cost difference between two essentially garden variety bolts is tiny in comparison



"grade 8" and 10.9 are different and unrelated systems for specifying a bolt. just so happens, they're roughly equivalent.
Click to expand...

ummm ok
 
Be aware that black oxide coated will rust up pretty quickly if left outside or wet
 
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