I've been looking for a button head cap screw that I could use with Gotti 3 piece wheels. The screw has to able to take 14 foot pounds of torque (168 inch pounds), so the normal versions you can find break.

By switching to socket head cap screws the torque issue.s goes away, but socket heads have a higher profile than I would like.

I know the Gotti folks sell, for about a buck apiece, the button heads that will take the torque, but would like to find a US supplier.

Need M6 x 35mm.

My unenducated research says that a M6 bolt that can take 14 ft/lbs would be grade 12.9. McMaster-Carr sells some but they are 'normal' allen head, not button. PN: 91290A334
Plus they're a black finish. But $11 for a pack of 100.



Here's a couple other options randomly found via Google (search: M6 12.9 button bolts)
https://www.boltmax.com/proddetail.php?prod=535078
http://www.mandsfastener.com/M6-Button-Hea...Screw_p_75.html

I would probably try and confirm with Gotti techs before using any of these.

The socket head screws torque fine, i.e., haven't had one break yet. No so with the button head ones, unless you buy them from Gotti.

I'll check those links Mark. Thanks.

have you tried
http://www.mrmetric.com/metric-fasteners/Button-Head/

They are in San Jose.

Because of the federal Fastener Act all fasteners are required to have a head marking. If you can show me the head marking I can tell you who made it so you can go to the source.

ARP might have something also

If you can get a photo send me a PM in case I don't see your posting here.

DAvid

You ended up being right Mark. A button head cap screw in M6 can only take 88 inch pounds of torque. A socket head can take 168 inch pounds, but is a higher profile than I like.

The button heads that Gotti sells will take the higher torque, but must be something special beyond the 12.9 specification.