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Old 11-02-2015, 03:44 PM   #1
sphanna
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Default 5/8 castle nuts vs nylon lock for rear axle hub

I would like to use nylock nuts instead of castle nut on my rear axle. I found it a little trying to get the cotter pin to line up at 100 ft #. Is there a reason that I should NOT use the nylon lock nuts? I respect so many of you on this wonderful site.
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Old 11-02-2015, 04:12 PM   #2
lyle planes
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Default Re: 5/8 castle nuts vs nylon lock for rear axle hub

Steve, After working on planes for the last 50+ yrs. The consensuse of myself and others. You never want to use lock nuts where there is a rotational force involved. The force can cause the nut to back off. This said others may disagree. Just my 2 cents. Cotter keys only.......Lyle.
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Old 11-02-2015, 04:15 PM   #3
Mitch//pa
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Default Re: 5/8 castle nuts vs nylon lock for rear axle hub

dont take it to 100 ft lbs. go to the next lowest torque load to catch the holes for the cotter pin.. i would stick with the cotter pin style and not trust lock nuts
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Old 11-02-2015, 06:58 PM   #4
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Default Re: 5/8 castle nuts vs nylon lock for rear axle hub

Thnk you Lyle and Mitch.
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Old 11-02-2015, 07:07 PM   #5
1931 flamingo
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Default Re: 5/8 castle nuts vs nylon lock for rear axle hub

If it doesn't line up to your satisfaction, you could try taking some metal off the backside of the nut or X2 what Mr. Mitch said.
Paul in CT
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Old 11-02-2015, 07:15 PM   #6
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Default Re: 5/8 castle nuts vs nylon lock for rear axle hub

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Quote:
Originally Posted by lyle planes View Post
Steve, After working on planes for the last 50+ yrs. The consensuse of myself and others. You never want to use lock nuts where there is a rotational force involved. The force can cause the nut to back off. This said others may disagree. Just my 2 cents. Cotter keys only.......Lyle.
I agree
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Old 11-02-2015, 07:31 PM   #7
CT AV8
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Default Re: 5/8 castle nuts vs nylon lock for rear axle hub

Steve,
I also agree with all of the above. Another method would be to use a very thin washer as a shim to get the nut clocked where you want it.
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Old 11-02-2015, 07:34 PM   #8
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Default Re: 5/8 castle nuts vs nylon lock for rear axle hub

The cotter pin hole will cut the nylon making it useless for locking
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Old 11-02-2015, 09:37 PM   #9
ian Simpson
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Default Re: 5/8 castle nuts vs nylon lock for rear axle hub

My experience with racing motorcycles suggests that positive locking via split pins or wiring is the only way to go. I used nylocks in non critical applications, but not where it mattered.
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Old 11-02-2015, 09:53 PM   #10
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Default Re: 5/8 castle nuts vs nylon lock for rear axle hub

If the castle slot doesn't line up try a different nut. When they are manufactured the thread lead is random to the hex, not indexed. This is especially useful for front wheel bearings where you have either too much pre-load or none in just 1/6 of a turn. I used to have a cigar box full of castle nuts but I gave up smoking. Now I just have a candy box full.
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Old 11-02-2015, 10:13 PM   #11
BILL WILLIAMSON
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Default Re: 5/8 castle nuts vs nylon lock for rear axle hub

What about the all steel, self locking NUTS???
Bill W.
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Old 11-02-2015, 10:33 PM   #12
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Default Re: 5/8 castle nuts vs nylon lock for rear axle hub

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Originally Posted by BILL WILLIAMSON View Post
What about the all steel, self locking NUTS???
Bill W.
They work fine.
So do plain hard high nuts with hard washers under them.
Assuming the taper has been lapped in and the nut is torqued to 125 ft lb, the axle will drive the car indefinitely with NO KEY.
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Old 11-02-2015, 11:04 PM   #13
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Default Re: 5/8 castle nuts vs nylon lock for rear axle hub

I have done all of the suggested methods except using difference castle nuts. Thin washer shims , grinding back side of nut, etc. I was hoping for a more convient way to do this. I thank you all for your comments. Sounds like Bill and Pete may think that all steel self locking nuts might work. I'm curious what Lyle and others would say about the steel locking nuts.
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Old 11-02-2015, 11:06 PM   #14
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Default Re: 5/8 castle nuts vs nylon lock for rear axle hub

Just remember that the 100lb 125lb torque on the nut is NOT a Ford specification of the time. Somewhere near there will be fine until time to repack/inspect the bearings.
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Old 11-02-2015, 11:53 PM   #15
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Default Re: 5/8 castle nuts vs nylon lock for rear axle hub

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Originally Posted by sphanna View Post
I would like to use nylock nuts instead of castle nut on my rear axle. I found it a little trying to get the cotter pin to line up at 100 ft #. Is there a reason that I should NOT use the nylon lock nuts? I respect so many of you on this wonderful site.
Hey Steve,
Have you checked out what Ford recommended for his rear axle nut torque ? It sure was not at and/or near 100 ft lbs !
IF you do as Pete suggests, i.e.- lapping the drum to axle taper, you may get away with such light torque. The bad results (busted keyway/cracked axle, wobble drums and poor braking) of loosely torqued rear axle nuts are just not worth the lack of proper information/torque.
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Old 11-03-2015, 01:05 AM   #16
Ron in Quincy
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Default Re: 5/8 castle nuts vs nylon lock for rear axle hub

As suggested by someone else, I torque to 90lbs then plus what it takes to line up for cotter key. Torque to at least 90 pounds, nothing less.

A little additional info; the original rear hub castle nut is a special hardened 5/8-18 castle nut and was designed to take the high torque with out damaging the axel threads; you can check my statement by looking it up in a Dealer Price List Book.

Ron
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Old 11-03-2015, 08:23 AM   #17
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Default Re: 5/8 castle nuts vs nylon lock for rear axle hub

U guys are all ok right. I am going to get some new cotter pins and castle nuts and do it the old fashion way. THX
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Old 11-03-2015, 09:06 AM   #18
BILL WILLIAMSON
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Default Re: 5/8 castle nuts vs nylon lock for rear axle hub

Well, IF Ford used a wrench, TWICE as long as a headbolt wrench, then we can assume that the hub nut was torqued to 110 FT LBS. If you're WORRIED about your life depending on a COTTER KEY, just think about your life depending on that TINY WHITE, PLASTIC RING, on your VALVE STEM CORE!!!!!!! Or those 4 SMALL, tire FOOTPRINTS, keepin' you "STUCK" to the pavement!!!!!
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Old 11-03-2015, 10:45 AM   #19
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Default Re: 5/8 castle nuts vs nylon lock for rear axle hub

been using nylocks for years . no problems .
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Old 11-03-2015, 01:58 PM   #20
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Default Re: 5/8 castle nuts vs nylon lock for rear axle hub

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Originally Posted by tbirdtbird View Post
This thread is about fixing something that is not broken.
i mean really how hard is the Ford way.....it was done that way on 5 million cars and now we can't do it to one car?
you wanna see what Lyle thinks? see #2
Plymouth, Dodge and others did it just like Ford. So there is even more than 5 million.
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