better brakes for a 620

[DarkMonster620]

I have some 320mm Brembo snowflake rotors on the way.  Here's hoping that they fit!

as long as they're 6 hole . . .

[Syscrush]

as long as they're 6 hole . . .

They arrived today.  6 hole as shown in the ad. 

[DarkMonster620]

They arrived today.  6 hole as shown in the ad. 

[Syscrush]

The calipers I had for this were missing the pinch bolts, so I ordered replacements in stainless from Pro-Bolt.  They arrived yesterday so I put the calipers back together, and all of a sudden the OEM mounting bolts look like utter garbage.  And I expect that the caliper mounting bolts are going to be the same story.

They don't list the Monster 620 or the older superbikes on their website, but they do have this guide:

Pro-Bolt rotor bolt guide.

The bike is in storage right now and I don't have ready access to it to pull parts and take measurements.  From the photos of various Monster and Brembo snowflake bolts & rotors I've found online, it looks like the LSSDISCDUC10 would probably work.  Any thoughts?

[BK_856er]

Don't know exactly which bolts you're referring to, but watch the bolt grade and specs for critical applications.  Some of the SS stuff out there is brittle and not well suited...

BK

[Syscrush]

Don't know exactly which bolts you're referring to, but watch the bolt grade and specs for critical applications.  Some of the SS stuff out there is brittle and not well suited...

This is solid advice.  I expect high quality from Pro-Bolt, and what I'm looking at are bolts that are specified for the intended application.

[ducatiz]

Don't know exactly which bolts you're referring to, but watch the bolt grade and specs for critical applications.  Some of the SS stuff out there is brittle and not well suited...

BK

Do not use anything less than A4 stainless.  Even that high grade stainless is insufficient to compare to 10.9

Most of the pinch bolts are 10.9 or 12.8 alloy. 

if you use A2 stainless, give me an email so I can buy a life insurance policy on you.

http://www.anzor.com.au/tensile-strength-comparison-chart

[Syscrush]

Do not use anything less than A4 stainless.  Even that high grade stainless is insufficient to compare to 10.9

All stainless fasteners from Pro-Bolt are 316, which is supposedly equivalent to A4, but it looks like there are multiple grades of 316 ands some of them are equivalent to A2.  From the chart you provided, 316 is definitely lower tensile strength than 10.9 or 12.9 (700-800 MPa vs. 1034-1200 MPa).

I've been looking for stories/evidence of failure of Pro-Bolt stainless fasteners in brake applications and not found any, but I'm not crazy about the idea of reducing the safety margin when it comes to brake-related parts.  Thanks for the pointer.

[Syscrush]

What's stressing me out about this, other than the money already spent on SS pinch bolts, is that Brembo won't sell replacement OEM pinch bolts (or anything else to service the calipers), Pro-Bolt sells SS pinch bolts specifically for this application but they're apparently far under spec, so the only option that's apparently safe is titanium, which is really pricey.

I made the purchase of the SS bolts on the strength of Pro-Bolt's reputation and this description on their website:

Stainless Steel Pinch Bolts for Brembo Calipers. These are the ones that go through the caliper itself pinching the two halves together (enough for rear caliper) The thread diameter is M8 with a 40mm length and has a 1.25 thread pitch and a low profile head. An identical replacement to the original only with great rust resistance! They fit most early Brembo calipers and can be torqued to manufacturers' original settings. Copper grease also supplied.

I've contacted their sales department for more info on specs etc.

[koko64]

I guess it depends on what grade stainless (and true quality of the stated material). I've also seen crappy Ti bolts from a dodgy source. At least Pro Bolt is a well established company that communicates with customers.
My dealer at least has new mounting bolts in stock. I noticed they went to silver zinc at some stage rather than the older style gold zinc. Fresh bolts really do tidy up the look.

[DarkMonster620]

I got some screws at Mcaster Carr . . .Made in Germany 10.9

[Syscrush]

I got some screws at Mcaster Carr . . .Made in Germany 10.9

Thanks for the pointer.

Here's a 12.9 with "ultra corrosion resistant coating".

$4.40 per pack of 10 

[DarkMonster620]

the ones I got have a hex head instead of either torx or allen

[ducatiz]

Thanks for the pointer.

Here's a 12.9 with "ultra corrosion resistant coating".

$4.40 per pack of 10 

That's a very good link.  I wonder what the coating is.

There is a coating called Dacromet which is the gold standard for alloy metal coating on fasteners.  I have a bunch of M8 and M6 in Dacromet and it's awesome.

Ducati has used yellow zinc 12.9 bolts on all their SBKs for years.

[Speeddog]

OEM bolts are 10.9.

Not relevant for this application on a 620, but '01 and earlier with a mechanical speedo drive need low head bolts, at least on that side.