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Cylinder Head Nuts
mickwinf:
following with interest as i fitted stainless nuts to my 550 head.
philward:
Good to hear everyones views! Done a bit of research myself and general consensus seems to point to issues. I am a fan of SS generally as just seems logical to avoid re-plating - I always use copper grease though, as everyone seems to suggest (read that bonding between SS and other contact material is to do with a electrolysis process). I have generally not used SS in load bearing area's to date - hence my original question?
philward:
--- Quote from: K2-K6 on February 08, 2021, 09:42:49 AM ---A useful discussion here http://www.volksbolts.com/faq/basics.htm specifically about A2 bolts.
As oddjob points out, it's the stud on these engine that is stretched to tensile load as the nut is compressed.
I was trying to find a definitive comparison, but getting the rating of the Honda originals is not easy.
Something nagging says I wouldn't use them unless I could find more about rating.
--- End quote ---
Thats a really interesting article - especially the part about tensile strength comparisons and 'Galvanic Corrosion' and confirms that if a barrier used (copper grease), most uses should be ok
K2-K6:
Notice the shift in torque they give when using nickel grease? Approximately 10%.
K2-K6:
I was trying to find a link for the 8 identification bolts used by Japanese vehicle manufacturers and if if related to any structural specification, but seems indistinct.
http://sanei-screw.com/strength a little more discussed on here, and looks to be something of reference to 8.8 material specification, but that's by looking at more wide ranging variable and so more an impression than fact.
The bolts and studs do seem to have a competent tensile capacity that could tally with the numbers around for expected torque ratings used in their applications, with things like the studs having that high tensile "ring" to them if you tap them with something metal when they are left exposed on bare crankcase. They have a spring like quality to them that is signature of heat treated and tempered steel.
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