Lugnuts for C4 ZR1 Wheels

[Joe C.]

What kind of lugnuts did these cars come with?
Were they the same type as are on my '85, with the plastic covers?

Joe

[Mike M.]

Re: Lugnuts for C4 ZR1 Wheels

my 90 and 92 ZR-1's came with chrome plated metal covers for the lug nuts, not plastic. mike

[Joe L.]

Re: Lugnuts for C4 ZR1 Wheels

What kind of lugnuts did these cars come with?
Were they the same type as are on my '85, with the plastic covers?

Joe

Joe-----

As far as I know, yes. 1985 Corvettes originally used lug nut GM #14046906. These were a metric 12 X 1.5 inner thread with a metric 24 X 2.0 outer thread (for plastic cap). I do not know what the finish was.

For 1985, the plastic caps, GM #10028614, were supposed to be black, but I'm not sure if they were, or not.

1990-91 ZR1 was supposed to have used cap GM #10052358. This was a plastic cap with a gray finish. 1992-95 ZR1 and LT1 used cap GM #12337914. This was a plastic cap of metallic silver finish.

1990-E92 for both ZR1 and LT1 used wheel nut GM #10091792. This was a metric 12 X 1.5 internal thread with a metric 24 X 2.0 external thread. How it differed from the 14046906 I do not know.

[Joe L.]

Re: Lugnuts for C4 ZR1 Wheels

my 90 and 92 ZR-1's came with chrome plated metal covers for the lug nuts, not plastic. mike

Mike-----


If 1990 and 1992 ZR1 used chrome plated metal caps for the wheel nuts then it must have been a PRODUCTION-only piece, never available in SERVICE. I can't find any information that any C4 Corvette ever originally used a metal wheel nut cover, either chrome plated or otherwise.

In particular, the 1992 ZR1 wheels were painted a metallic silver color. I would think that chrome plated lug nuts in combination with these would have appeared very "non-factory-like".

[Joe C.]

Re: Lugnuts for C4 ZR1 Wheels

Joe-----

As far as I know, yes. 1985 Corvettes originally used lug nut GM #14046906. These were a metric 12 X 1.5 inner thread with a metric 24 X 2.0 outer thread (for plastic cap). I do not know what the finish was.

For 1985, the plastic caps, GM #10028614, were supposed to be black, but I'm not sure if they were, or not.

1990-91 ZR1 was supposed to have used cap GM #10052358. This was a plastic cap with a gray finish. 1992-95 ZR1 and LT1 used cap GM #12337914. This was a plastic cap of metallic silver finish.

1990-E92 for both ZR1 and LT1 used wheel nut GM #10091792. This was a metric 12 X 1.5 internal thread with a metric 24 X 2.0 external thread. How it differed from the 14046906 I do not know.

Thanks Joe,
The original caps for the '85 are black plastic. The lugnuts are dichromate.

I have decided to use my original lugnuts on the ZR1 wheels.............I just ordered a set of chrome finished plastic caps from CC, catalog part number 644139, after looking around and finding closeup of the wheel at the bottom of this page:

http://www.web-cars.com/corvette/zr-1-4.php

[Joe L.]

Re: Lugnuts for C4 ZR1 Wheels

Thanks Joe,
The original caps for the '85 are black plastic. The lugnuts are dichromate.

I have decided to use my original lugnuts on the ZR1 wheels.............I just ordered a set of chrome finished plastic caps from CC, catalog part number 644139, after looking around and finding closeup of the wheel at the bottom of this page:

http://www.web-cars.com/corvette/zr-1-4.php

Joe----


I think your existing lug nuts will be ok with the ZR1 wheels as long as they are the type with the external threads for the caps. However, if it were me, I think I'd replace them with lug nuts that are known to be compatible with the ZR1 wheels. These would currently be GM #10028615. You can buy a set of these for about $20-25.

Looking at the photos in the link you provided, I do not see where the lug nut caps appear to be chrome plated. They appear, to me, to be painted metallic silver, just as GM says they should be and just as I would expect.

[Joe C.]

Re: Lugnuts for C4 ZR1 Wheels

Joe----


I think your existing lug nuts will be ok with the ZR1 wheels as long as they are the type with the external threads for the caps. However, if it were me, I think I'd replace them with lug nuts that are known to be compatible with the ZR1 wheels. These would currently be GM #10028615. You can buy a set of these for about $20-25.

Looking at the photos in the link you provided, I do not see where the lug nut caps appear to be chrome plated. They appear, to me, to be painted metallic silver, just as GM says they should be and just as I would expect.

Joe,

Is there a difference in the description of the 10028615 v 14046906? The lugnut CAPS in the photo link I gave you, above (click on photo of the yellow ZR1 and enlarge it) are identical to the early C4 caps (84 - at least '87, AFAIK), except for the color. The lugnuts are probably all the same for those years. Caps were available in black (the most common color), dull metallic silver, and possibly chrome plastic (this is what Mike might have, unless they are aftermarket with stainless steel CLADDING (non-removable).

Did any of the C4 ZR1's have a chrome wheel option? I don't thinks so. AFAIK, all ZR1 wheels came exactly as pictured in the above link, and so, were originally fitted with the silver caps. I might be wrong on the chrome wheel thing.............somebody more knowledgeable please chime in here. The only other way that those ZR1 (style) wheels came out of the factory, was all-gloss black on the '96 Gran Sport, in which case, those same lugnuts were fitted with my (1985) style black caps.

BTW: ALL C4 Corvette, in the McGard catalog, show 12mm x 1.5 threads, with cone style (60 degree) seats.

[Ed H.]

Re: Lugnuts for C4 ZR1 Wheels

Joe,

my lug nuts are original and came with a set of four special lug nuts and a special lug nut socket. It also came with the plastic silver, not chrome lug nut covers. My problem is I am missing the green bag marked with a part # and the letters "DK". Anybody know where I can find one of the bags.

[Joe C.]

Re: Lugnuts for C4 ZR1 Wheels

Joe,

my lug nuts are original and came with a set of four special lug nuts and a special lug nut socket. It also came with the plastic silver, not chrome lug nut covers. My problem is I am missing the green bag marked with a part # and the letters "DK". Anybody know where I can find one of the bags.

Ed,
Thanks for joining in, and verifying. Yes, that is what have been able to deduce thru this thread, and further searching. I am the original owner of my '85, and I took delivery with 16 standard lugnuts with black covers and 4 locks with special black covers and a special lock driver socket which engages the locking lug in the same manner as the caps do.

All Corvettes of that era left the factory with 20 standard lug nuts. In many cases the locks, with their special caps were installed during dealer prep.

[Joe L.]

Re: Lugnuts for C4 ZR1 Wheels

Joe,

my lug nuts are original and came with a set of four special lug nuts and a special lug nut socket. It also came with the plastic silver, not chrome lug nut covers. My problem is I am missing the green bag marked with a part # and the letters "DK". Anybody know where I can find one of the bags.

Ed-----


Things may have changed for 1993, but my 1992 LT1 was supplied with the special locking nuts in a clear plastic bag labeled with part number 10180888. the broadcast code "DUJ", and the term "wheel locking kit". In the bag were 4 special locking nuts as well as the special socket used to remove/install them. Also included were an instruction sheet and a foil label with instructions on how to obtain a replacement socket.

I would expect that at least for any given model year, the KITS for LT1 and ZR1 would have been the same. There was absolutely no reason for them to be any different. I don't know if there were multiple kits (with different part numbers and broadcast codes) used which each contained differently coded locking nuts and socket OR if the kits were all of the same part number and broadcast code but with the different configuration locking nuts and socket randomly packaged by the supplier. I strongly suspect, though, that there were different part number/broadcast code kits used for all of the different locking combinations.

Also, I do not know if the kits were unique to a particular model year or if the same kits were used for several model years. However, I would strongly suspect that the same kits were used for several model years.

The 10180888 kit was never available as a SERVICE item; it was a PRODUCTION-only piece.

Photos below of the bag, instruction sheet, and foil label.

[Joe L.]

Re: Lugnuts for C4 ZR1 Wheels

Here's the foil label; I didn't get it attached to my previous post.

[Bill M.]

Re: Lugnuts for C4 ZR1 Wheels

Ed-----


Things may have changed for 1993, but my 1992 LT1 was supplied with the special locking nuts in a clear plastic bag labeled with part number 10180888. the broadcast code "DUJ", and the term "wheel locking kit". In the bag were 4 special locking nuts as well as the special socket used to remove/install them. Also included were an instruction sheet and a foil label with instructions on how to obtain a replacement socket.

I would expect that at least for any given model year, the KITS for LT1 and ZR1 would have been the same. There was absolutely no reason for them to be any different. I don't know if there were multiple kits (with different part numbers and broadcast codes) used which each contained differently coded locking nuts and socket OR if the kits were all of the same part number and broadcast code but with the different configuration locking nuts and socket randomly packaged by the supplier. I strongly suspect, though, that there were different part number/broadcast code kits used for all of the different locking combinations.

Also, I do not know if the kits were unique to a particular model year or if the same kits were used for several model years. However, I would strongly suspect that the same kits were used for several model years.

The 10180888 kit was never available as a SERVICE item; it was a PRODUCTION-only piece.

Photos below of the bag, instruction sheet, and foil label.

Joes and Ed:

My '92 LT1 has the same kit (10180888, DUJ, clear bag). The JG has 10180891, DUK, white bag for a '93 ZR-1.

My '92 (car 9704) lug nuts measure 1.0 inches long. I bought replacements (can't find the receipt for a part no.) that are 1.25 in. long.

Bill

[Tom H.]

Re: Lugnuts for C4 ZR1 Wheels

Joe,


Did any of the C4 ZR1's have a chrome wheel option? I don't thinks so. AFAIK, all ZR1 wheels came exactly as pictured in the above link, and so, were originally fitted with the silver caps. I might be wrong on the chrome wheel thing.............somebody more knowledgeable please chime in here.
BTW: ALL C4 Corvette, in the McGard catalog, show 12mm x 1.5 threads, with cone style (60 degree) seats.

No ZR1's came with chrome wheels..... or nut covers.

[Joe C.]

Re: Lugnuts for C4 ZR1 Wheels

No ZR1's came with chrome wheels..... or nut covers.

Didn't think so.
I wear nut covers...............under me trousers.
What about nut cases?

[Joe L.]

Re: Lugnuts for C4 ZR1 Wheels

Joe,

Is there a difference in the description of the 10028615 v 14046906? The lugnut CAPS in the photo link I gave you, above (click on photo of the yellow ZR1 and enlarge it) are identical to the early C4 caps (84 - at least '87, AFAIK), except for the color. The lugnuts are probably all the same for those years. Caps were available in black (the most common color), dull metallic silver, and possibly chrome plastic (this is what Mike might have, unless they are aftermarket with stainless steel CLADDING (non-removable).

Did any of the C4 ZR1's have a chrome wheel option? I don't thinks so. AFAIK, all ZR1 wheels came exactly as pictured in the above link, and so, were originally fitted with the silver caps. I might be wrong on the chrome wheel thing.............somebody more knowledgeable please chime in here. The only other way that those ZR1 (style) wheels came out of the factory, was all-gloss black on the '96 Gran Sport, in which case, those same lugnuts were fitted with my (1985) style black caps.

BTW: ALL C4 Corvette, in the McGard catalog, show 12mm x 1.5 threads, with cone style (60 degree) seats.

Joe-----


Yes, there is a difference between the 10028615 and the 14046906. From what I can tell, the 14046906 was a FLANGED lug nut, but without external threads. Just how these were used with lug nut caps I have no idea. However, the 14046906 were the nuts which GM originally and thereafter cataloged for all 1985 Corvette applications. The 14046906 was never replaced by the 10028615. Rather, it was replaced by GM #9591664 and, later, GM #9591700. The 9591700 is GM discontinued and I can find no new number although there may be one.

While the chrome ZR1 wheels, as well as chrome 1992-96 LT1 wheels, have proven to be very popular as a CUSTOMIZING ITEM, as Tom mentioned, they were NEVER originally used on any ZR1 or, for that matter, any 1992-96 Corvette. I believe that the chrome lug nut covers sold by the various vendors are intended to be utilized with these non-original chrome wheels.