Lotus Elan

Wheel stud length and thread size - bolt on wheels

PostPost by: dunclentdr1 » Fri Jan 08, 2021 2:34 pm

Can anyone advise on the length and threat size of wheel studs for S1/2 bolt on wheels?

Thanks

David
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PostPost by: Quart Meg Miles » Fri Jan 08, 2021 6:05 pm

What sort of threat did you think it poses? :D

The threads are 3/8 UNF (24 tpi). If you don't get a reply tomorrow I'll take a wheel off and measure length but I can't tell you the spline size. If I forget PM me.
Meg

26/4088 1965 S1½ Old and scruffy but in perfect working order; the car too.
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PostPost by: Quart Meg Miles » Fri Jan 08, 2021 11:05 pm

A catalogue told me where one was!

IMG_8684.JPG and
Diameters:

Top cap: 5/8 inches
Spline: 17/32 inches o/d (this one is only 33/64" and is too small)
The spline is about 28-30 tpi.
Thread: 3/8 UNF [0.375] inches 24 tpi

Lengths from RH end:

Unthreaded start: 1/8 [0.125] inches
Top of thread: 3/4 [0.750] iinches
Start of spline: 1 [1.000] inch exactly
Top of spline: 1 1/4 [1.250] inches
Cap at 5/8 inch: 1 11/32 [1.345] inches
Total length: 1 13/32 [1.406] inches
Meg

26/4088 1965 S1½ Old and scruffy but in perfect working order; the car too.
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PostPost by: dunclentdr1 » Sat Jan 09, 2021 2:53 pm

Great, thank you, much appreciated.

David
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