I got new tires for one of the XK8s today, and when I was reinstalling the wheels I noticed that a previous owner had installed "close enough" conical seat lugnuts. The wheels don't appear to be too damaged, but I see in seaching for the correct Mag style lug nuts, they have not gotten any less expensive since my last Jaguar. It looks like the norm is about $25 each.

However searching around for just Mag lug nut with the thread size, but NOT the term Jaguar turned up these for Infinity/ Nissan vehicles. They look like they should fit, and a set of 24 is less than 1 Jaguar nut. Available in black or chrome.

 

All modern Jag lug nuts are 12 x 1.5 not 12 x 1.25, and I am fairly sure that includes the X100.
Maybe that same supplier does them in 12 x 1.5?

 

They are not metric ...1/2 in UNF is correct.

 

I think I still have an extra set of lug nuts that came with my Whitley's - you're welcome to them just cover shipping - will check garage and post pics later

 

There are 12x1.5 mag nuts as well, I think those are used on some Toyotas. But I am pretty sure X100, and earlier Jaguar were not 12x1.5, but 12x1.25.

Later Jaguars might be able to use the Toyota / Lexus nuts. I ordered replacement lug nuts for a 2004 Lincoln LS to replace the ones on my old X-type. They looked identical, but only cost about $1 each.

 

I have read that, but have also read 12x1.25.

It seems very odd that Jaguar would use metric everything, EXCEPT lug / wheel nuts for years, on multiple vehicles. It seems more likely that 1/2"x 20 is close enough to seem like it fits. If you do the conversion it is 12.7mm x 1.27mm, slightly bigger diameter, and very close in thread pitch. Probably the larger diameter nut allows the slightly off thread pitch to fit. But stranger things have happened.

I will see if I can get a 12.x1.25 nut today to try on one of the studs.

 

That is very kind of you. Please do let me know.

 

they are not metric period end of story. half shaft nuts and axle shaft threads aren’t either.

 

Early wheel nut specs

 

You are correct, both the original Jaguar nut, and whatever aftermarket conical nuts I have both fit a 1/2 x 20 stud better than the 12 x 1.25. They will run completely onto a 12 x 1.25 stud, but fit loosely.

I could not find a M12 x 1.25 nut on a Sunday to try on the car. Back to the drawing board.

 

A bit more digging on ebay turned up these;


Looks like they might be a bit too long, and need a trim. But $25 shipped for enough to do the entire car.

 

1/2 x UNF all over ebay no problem

 

Got a link?
All I am finding are the OEM nuts for $20 minimum - $400 to do the entire car,
Or used ones that are still very expensive for the condition they seem to be in, best price so far is about $70 to do the whole car.
Or conical nuts that don't work with the stock wheels, I already have a set of those.
Or Mag style nuts with a shank that is .75" or 1" far too long.

Or the White Knight brand I posted about for $25 per set of 20.

 

Here’s what I’ve got- bought on Amazon 2 years ago at $15 for four. However, looks like Amz doesn’t have them any more (and a search for these 73187SM 1/2” nuts returns results for incorrect 12mm with a slightly different model number ).

They still look great after 2 years. Not as cheap as the White knights, but no idea how they compare, longevity-wise.

 

There are some of those on ebay right now. I didn't pay much attention to them since they didn't specify length other than "short." One listing for Gorilla short mags said the shank was .30. Good to know they fit.

It seems that 73188sm is the same part. I see them in lots of 100 for a reasonable price, around $120. Summit Racing also appears to sell them individually for $1.99. They have a .50" shank length according to Summit.

 

I have been known to improvise and make do with what l have, but wheel studs and nuts on a car in which l am a likely occupant is not a place l want to do it.

 

Still on my Amazon ""U/D alloy wheel lug nut for jaguar XK " 5 pieces £11.98.
Auto reserve parts always have them

 

Well, those don't fit.

The White Knight nuts arrived, and will not fit into the lug holes in the wheel. I got out my calipers and they measure .730" in diameter, just as specified. I measured my factory lug nuts, and they appear to be just under .700".

The Gorilla ones above appear to be the best bet so far, they speficify .690" diameter.