Stainless Disc Bolts

[technostructural]

To clarify my comment about temperature:
Unless you are on a race track, brake discs will typically operate at 100-200 deg C in their hottest areas (i.e. where the brake pads touch them). They will be cooler in areas where they are bolted to the big heat-sinks  that are the wheels. This temperature isn't significant for a steel bolt, stainless or otherwise. After all, piston rings operating at 800-900 deg C can be made of stainless steel.


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Ah, sorry for the confusion on that. I was more so addressing the tendency for stainless to weld or "gall" as another has referred to it as. Without being educated in materials engineering or any other hard science, my presumption was that this factor may be exacerbated in high heat situations. This of course would have less of an impact on the fasteners actually breaking or not performing properly and moreso just being a total pain in the ass to get off again.

[Filmcamera]

Ah, sorry for the confusion on that. I was more so addressing the tendency for stainless to weld or "gall" as another has referred to it as. Without being educated in materials engineering or any other hard science, my presumption was that this factor may be exacerbated in high heat situations. This of course would have less of an impact on the fasteners actually breaking or not performing properly and moreso just being a total pain in the ass to get off again.

If you are going to use stainless steel bolts be sure to always use copper anti seize as well

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[technostructural]

Does anyone know the heat tolerance of copper anti-seize? It's great stuff, but I wonder how well it holds up in very hot applications (e.g., exhaust bolts).

[Laitch]

Does anyone know the heat tolerance of copper anti-seize? It's great stuff, but I wonder how well it holds up in very hot applications (e.g., exhaust bolts).

Google broken where you are, techno? :giggles ±1800ºF depending on the brand.

[technostructural]

Google broken where you are, techno? :giggles ±1800ºF depending on the brand.

Haha. Sorry. Had a work event last night with excessive drinking. I'm a bit intellectually indolent today.

It's always worth asking though, you never know what sort of alternative facts you might discover. 

[Chaos]

Getting back to torque and tensile strength of the disc mounting bolts, I was surprised that Haynes recommended torque was only 21.5 ft/lbs. for the K75-100 front rotors.   I was expecting an epic struggle getting the old ones off and they just about fell off by themselves. 

[Filmcamera]

Getting back to torque and tensile strength of the disc mounting bolts, I was surprised that Haynes recommended torque was only 21.5 ft/lbs. for the K75-100 front rotors.   I was expecting an epic struggle getting the old ones off and they just about fell off by themselves.

Yoy are right i have often thought the settings were really low. It seems very few bolts have to be VFT on the bike. The biggest torque setting I have seen so far was on the clutch nut.

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[Martin]

The low torque setting is probably due to the fact that with the rotors you are looking at shear strength (rotational). In high torque applications like cylinder heads you are trying to hold the cylinder head down against compression.
Regards Martin.

[Chaos]

I was having flashbacks of some Brit car rotors that I had to use breaker bars and dynamite to dislodge.