nylex lock nuts washers or not

An alternative to a nyloc is an aircraft K nut.

All metal locking nut with a reduced hex (so ideally you need a six point socket for tensioning) they will not come loose and can be infinitely reused.
They can be had in zinc plated or moly coated, it doesn't really matter which you use.
Be sure to use a genuine certified aircraft nut and not a cheap Chinese knockoff.

refer notes 7-64 -f and table 7-2. slide bar on right side of attachment should take you to the right bit





[ame]http://www.faa.gov/documentLibrary/media/Advisory_Circular/Chapter_07.pdf[/ame]

Quote:

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Originally Posted by Graeme

What's metric or otherwise got to do with not re-using nyloc nuts?

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loctite 243 is, or was, the defence authorised loctite to use in place of new nyloc nuts when you had no choice but to reuse standard nyloc nuts. there was a list of about 5 caveats on doing so but the 3 i distinctly remember are

1. they were to be replaced at the next service
2. if there was already loctite in evidence if you had to reuse them then replacement nuts were to be ordered and placed onto the RPS common item list for your workshop
3. if loctite was already evident then the threads were to be meticulously clean on both the bolt/stud and inside the nut before being reused.

edit..

in addition to the info in the pdf above, prevailing torque is the torque required to wind the nut onto the thread.

IF you have to wind the nut on enough turns you can "wear out" the nyloc and it wont meet spec before it gets to the point where you are torquing it up.

forgot to mention the nyloc should have 2 threads protruding from the nylon section to be acceptable.

Quote:

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Originally Posted by DazzaTD5

Just some info....

*Nylocs or rather "Nylon Inset Locknuts" should only be used once.
*shouldn't need any other locking such as using thread lock.

The more important part..
*Land Rover prop shaft retaining nuts and bolts are a 3/8 UNF thread, this includes new Defender TDCi (puma) models, the 3/8 UNF thread is also used on the diff carriers (non Salisbury diffs).

*The original 3/8 UNF nylon locking nuts Land Rover use are some non standard thickness.
*You can buy either thicker nuts or thinner nuts.
*In some applications such as Land Rover Discovery 2, the bolts on the transfer case end are too short too use the thicker nuts, so using the thinner nuts resolves this.
*The rear prop shaft on the transfer case on a Defender shouldnt (well not that I have seen) doesnt suffer the short bolt issue, so using the thicker nuts should be ok.

*You are not doing something silly such as using a Metric Fine nut are you?While I havent tried this and wouldnt have thought the thread pitch would be close enough for it to tighten up.

Pic below: Left 3/8 UNF thin nut, centre 3/8 UNF Land Rover nut, right 3/8 UNF standard thickness.

Its common for repairers *cough* dealers to re-use the nylocs, prolly because they dont know the nuts arent metric.

Regards
Daz
P.S Using a nylon locking nut that is too thick doesnt allow the thread to cut into the nylon part right at the end of the nut

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no dazza not the thin ones cheers