Lotus Elan

Rear hub nut size

PostPost by: englishmaninwales » Mon Apr 15, 2024 8:47 pm

IMG_6447.jpeg and

This rear hub retaining nyloc was supplied to me a few years ago (I can’t remember which supplier) and is unused. When checking I found it is too high and not fully engaging the thread - the nyloc that came off was half height. What thread size is this so I can get a replacement please?
Thank you.
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PostPost by: Gazzerb » Tue Apr 16, 2024 7:56 am

Malcom
The rear hub nuts are 5/8" UNF and were originally of the 'Thin' profile. As far as I can tell these generally are no longer available, only the full height nuts.
My original thin nuts were of about 0.550" high compared with the full height nut of 0.750" height.
If you have access to a lathe, the full height can be readily reduced to the thin height taking care to keep the thread perpendicular to the new face as picture.
I am happy to machine these for you if you cover postage cost.

Regards
Gary
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Full and thin 5/8" UNF nuts.
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PostPost by: ericbushby » Tue Apr 16, 2024 8:49 am

Hi Malcolm
Spalding Fasteners have 5/8 UNF `half` Nyloc nuts in stock in quantities of five upwards. They are on ebay just now. Although these might be too thin and a slightly shortened full nut may be better.
Cheers
Eric in Burnley
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PostPost by: englishmaninwales » Tue Apr 16, 2024 9:59 am

Thank you both, Gary for your kind offer and Eric for the advice and info on Spalding Fastners. Before I ask Gary to machine some nylocs for me, what is the general opinion please about the safety of using half height nyloc rather than original 0.550” height in this situation - a genuine risk or just theoretical? Which would you use?
Thank you.
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PostPost by: Craven » Tue Apr 16, 2024 10:49 am

Watch out for the grade of nut, can’t recall torque but its high.
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PostPost by: 512BB » Tue Apr 16, 2024 12:00 pm

'what is the general opinion please about the safety of using half height nyloc rather than original 0.550” height in this situation'

That would depend on what the half height measured. I certainly would not use anything thinner than the original height.

On many occasions, I have filed down nylocks to suite a particular application. Nothing difficult in that, just decent files required and a good eye.

Leslie
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PostPost by: englishmaninwales » Tue Apr 16, 2024 12:39 pm

Craven wrote:Watch out for the grade of nut, can’t recall torque but its high.

Thanks. The torque is 100-110 lb ft. What grade should I select, please?

Thanks, Leslie
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PostPost by: smo17003 » Tue Apr 16, 2024 1:08 pm

Rear hub nuts and the thick washers are both available from Kelvedon, SJS, etc. I would expect that they are correct for size and grade if they value their reputation as suppliers.
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PostPost by: englishmaninwales » Tue Apr 16, 2024 6:18 pm

I’ll check them out.
Thanks for all the advice.
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PostPost by: cliveyboy » Wed Apr 17, 2024 6:50 am

In an ideal situation you want the thickest nut that gives you two threads sticking out the end.
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PostPost by: Craven » Wed Apr 17, 2024 11:08 am

Old engineering rule of thumb, 1.5 x diameter of bolt for amount of engaged thread for max strength.
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PostPost by: englishmaninwales » Sat Apr 20, 2024 4:12 pm

smo17003 wrote:Rear hub nuts and the thick washers are both available from Kelvedon, SJS, etc. I would expect that they are correct for size and grade if they value their reputation as suppliers.

Just to provide feedback and complete the thread for future reference:
Spyder and SJS supply the hub nyloc machined to the correct height, But Kelvedon supply a full height nyloc to be machined.
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