Disc brake bolts

[Rocket Scientist]

Most locktight can be free'd with heat. Don't know if rotors get that hot.

 

[Paul Bryant]

If you look real close at the thread design you will see a ridge on the leading edge of the threads this is designed to keep the bolt locked in without the use of a thread locker.

Sonny, can you expand on this a little, I've not heard of this style of thread form before, do you have any photos of this thread ?

 

[sonny]

I do not have a pic of one. The design is really simple. A slight ridge on the outer portion of the thread locks the bolt in place. Once removed the ridge is destroyed. Any time you read in a service manual were it state"s remove bolt and discard you can pretty much count on the bolt being what we just described. I know Harley uses this type of bolt on there brake calibers along with Truimph. There is a name for the thread design but I forgot what it is called. I will look it up and get back to with the proper name of thread design.

 

[Chip]

The issue with these fasteners are the concern the threads are stretched or pulled. Every time a bolt or screw are reused this can happen. Most often this makes the bolt feel loose while threading into the female threads. If this happens to any fastener it should be discarded. The use of products like Locktite blue reduce the chances that the fastener "loosens up". Of course you can solve all this by spending $7.80 per...

 

[sonny]

Paul Byrant here is a good pic of what I have been talking about. The area highlighted.

 

[Paul Bryant]

Paul Byrant here is a good pic of what I have been talking about. The area highlighted.

O.K. thanks Sonny, I've seen that thread form before but didn't know/realise the relevance.
Just goes to show you can always learn something new

 

[Triple Trouble]

"Prevailing torque" is the terminology for these types of fasteners. A quick google will provide lots of info.

 

[Jag]

Almost afraid to take them off now and because everything on the bike has been grossly over torqued by the morons who assembled the bike. Might open up a can of worms that I don't want to deal with?! I think the paint marks on the bolts means he tighten them not torqued them???

 

[sonny]

Thanks forgot what the real name of that type of bolt was called. Got use to calling them throw away's.

 

[Sensfan]

Almost afraid to take them off now and because everything on the bike has been grossly over torqued by the morons who assembled the bike. Might open up a can of worms that I don't want to deal with?! I think the paint marks on the bolts means he tighten them not torqued them???

Traditionally, any bolts or nuts that were important ,eg. wheels, brake parts, even filters on large equipment, we would always put a paint stripe on them so we could visually see if they have become loose over time.