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Discussion Starter #1 (Edited)
Hi. I have a cbr 600rr 03
Recently i removed my right fairing and i've noticed that two of the Wellnuts was destroyed. Ive made a search on the internet and on the parts catalog, found that it's called "Wellnut' or "Well nut". I thought that was easy, but after this, problems starts....
I found on parts catalog that it uses 5mm wellnut. I thought nice, so i did a search in internet. First, i watch the side of my destroyed wellnut, it write on it "WELL NUT 90 C-550". I type on google "wellnut c550" and the first result was this http://www.bikersfinder.com/index.php?case=product&proddb=18&pid=8574
It says M5X0.8. So it was called M5 huh? Nice. I searched on ebay for M5 wellnuts and i found some. But wait, what does it mean 0.8? Maybe 0.8cm? I was afraid.
With search on google, this page
http://www.desmoparts.com/products/parts-catalog/ktm/m5-wellnuts
says 4mm is M4, 5mm is M5 and 6mm M6. Sound cool and absolute logical. Hmmm so i thought the first page was wrong and M5 is 5mm. I did some research in the web, there is NO ONE SINGLE PAGE that says clearly "M5 is 5mm" or "M5 is this mm or that mm". Not even one.
Then i found a third page
http://www.thread-rite.com/pop_nuts/well_nut_standard.htm
Here, the fun starts. It says M5X0.8 i thought "ok, so M5 means that is 0.8cm, that's over, everything other i read was wrong". WRONG
Because it says that the C550 (that my bike had) belongs to the M5 family of wellnuts the 0.8cm ones! One other thing, no page writes 0.8CM, just 0.8 without explaining if it's the size of the nut in millimeters, centimeters or not. Anyway
I read the parts catalog again, i found that this wellnut is 5mm. What the f**k, i looked for it's screw, it says 5mm. I went to my bike with a digital caliper (with plenty of nerves, swearing, 3:00 AM the night while i wear pajamas and slippers), checked the screw and indeed it's 5mm.
CONCLUSION!
So, im searching a 5mm wellnut, writing C550 on it, but it's not C550 cause http://www.thread-rite.com/pop_nuts/well_nut_standard.htm says that C550 is M5 and all other pages does not clear what mm is M5 while http://www.desmoparts.com/products/parts-catalog/ktm/m5-wellnuts claims that M5 is 5mm but here comes http://www.bikersfinder.com/index.php?case=product&proddb=18&pid=8574 that says that M5 is 0.8 (don't know what they mean by saying 0.8) and it's NOT 0.8cm because the 600rr 03-04 parts catalog says that the screw and the wellnut is 5mm, not 8mm.
Anyway, i order from ebay wellnuts 0.5mm. I don't know how they call them (M5 or Z4 or WELLNUT-Turbo), nor i want to learn, i just know that they are 5mm. You may laugh or not with this, but please if someone knows for sure, it would be good and wise to tell us which pages are wrong and which are not. I found my wellnuts, if another guy searching for them, he will be very confused and in the end he will go to the honda dealer to buy for sure the right wellnut but for higher price.
 

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*BOTM Feb '11, Mar '12*
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OMG dude you are WAAAAAAAAAAAAAAAAAAAAAAAYYYY over thinking this, lol.


First, whenever a bolt, nut, etc is metric is starts with M and everything that follows it is metric

Second, the x(#) is the length of the bolt or whatever. So your well nut (M5x0.80) is a metric 5 with a length of 0.8. Which is the right one for your bike.
 

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Discussion Starter #3 (Edited)
OMG dude you are WAAAAAAAAAAAAAAAAAAAAAAAYYYY over thinking this, lol.


First, whenever a bolt, nut, etc is metric is starts with M and everything that follows it is metric

Second, the x(#) is the length of the bolt or whatever. So your well nut (M5x0.80) is a metric 5 with a length of 0.8. Which is the right one for your bike.
Thanks for the info but sorry, I disagree. First because as you can see in http://cgi.ebay.com/M5-Well-Nuts-Rubber-Fairing-Nut-Wellnuts-pack-6-/300516296509?pt=UK_Motorcycle_Parts&hash=item45f82ac73d (see the picture with the dimensions)
and here http://www.thread-rite.com/pop_nuts/well_nut_standard.htm
0.8 is not any length and secondly because i found some M5 in inches. So tell me one reason to use M when it is in inches! Anyway, my personal opinion is that page http://www.thread-rite.com/pop_nuts/well_nut_standard.htm
is full of sh*t and that all evil starts from here (and lives there).
It seems nice and detailed, but give a look to the image up right, the one that explains the part numbering. It has for example the C 4 40 L 5, ok nice.
It says that C means chloroprene rubber, i understand.
Then it says that 4 means Nominal thread size: M
What is this? Do they use drugs or something? 4 means M? They could just say 4 is medium, 5 is hard etc. Anyway the rest of the explanation is right but personally i believe that C-550 (the right one) means C for material, 5 for 5mm screw hole and 50 for outer size in mm (the size of the hole you want to put it to). And that M5 is 8mm not 5. On the other hand, you might have right cause if M5X0.8 pattern they use, if 0.8 means 8mm, why use cm instead of mimimeters? Im confused already. And why they jack*sses http://www.thread-rite.com/pop_nuts/well_nut_standard.htm use so many details like hardness, optimum torque, tensile allowable and failure and DON'T WRITE CLEAR WHAT TYPE OF SCREW YOU USE?
 

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*BOTM Feb '11, Mar '12*
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Well according to your first link, in the case of well nuts the second number after the M5 is the flange thickness. Which makes since because the length of the screw varies depending on the material you are using the well nut on. So it would seem the only constants in well nuts are the thread size (M5) and the flange thickness (0.8) since the well nut compresses to the object it is securing.

I'll just add this. Order the M5 well nuts in the first link. I guarantee you the will work.
 

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Discussion Starter #5 (Edited)
OMG dude you are WAAAAAAAAAAAAAAAAAAAAAAAYYYY over thinking this, lol.


First, whenever a bolt, nut, etc is metric is starts with M and everything that follows it is metric

Second, the x(#) is the length of the bolt or whatever. So your well nut (M5x0.80) is a metric 5 with a length of 0.8. Which is the right one for your bike.
You might be right http://en.wikipedia.org/wiki/Screw
M5 means metric 5, thus 5mm
0.8 number that comes with M5, is used in case of hexagon bolts (M5 uses Number 8 wrench). In our case (allen) we don't care about the wrench size.
Or there is a case that 0.8 means that what you said in your last post.
 

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M5 will always be a 5mm nut / bolt, the rest depends on the particular fastener you are talking about... in the case of well nuts, its flange thickness. Other times they may be talking about thread pitch (there are two that are commonly available) other times it will be bolt length... and there are a thousand other things that it can refer to, it just comes down to what the manufacturer means.
 
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