Rear Sprocket Nut/Bolt Stripped

I've been putting my bike back together after cleaning and regreasing the rear suspension linkages. I was about to get the rear wheel back on and thought I'd take the sprocket off to clean it up a little, got it back on with the nuts just nipped up. fitted and torqued the wheel, set about torquing the sprocket nuts to 60Nm as per the Haynes. I started incrementally tightening the nuts and got to the first one I was going to properly torque and it just kept going with no sign of getting tighter and has stripped either the threads of the nut or bolt and can't get it off to replace. I'll get it off somehow, but I'm well peeved off! Can anyone offer an explanation as to how this has happened. Has it got something to do with torquing a nut with a washer under it?

Cheers,
Dave

[Bibio]

you might find that the bolt is not sitting properly in its housing. the back of the sprocket bolts are weird key type.

if all else fails it nut splitter time.

Nah, I can see swarf coming out of the threads of the bolt. How does one go about splitting a nut without damaging the bolt, just in case the bolt is fine. I'm expecting the bolts are far harder than the nuts in this scenario.

[Jayneflakes]

They do that, rubbish bolts I am afraid. I had it happen when I fitted Bibio's speedo rotor and I had to cut the nut off with a Dremmel. A replacement costs about seven quid and just to be awkward they have a funny shaped head so fitting a standard nut and bolt is a pain, but doable.

Good luck.

Thanks, Jayne. I really didn't think Suzuki would skimp on fastners that were so crutial.