ok to use wrong lug nuts? - Chevy Impala Forums
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post #1 of (permalink) Old 03-31-2019 Thread Starter
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ok to use wrong lug nuts?

the guy at napa let me try one on before i bought them. but only when i got home did i discover its not 7/8 and id have to carry my 4 way wrench in the car. is it safe to use a smaller lug like this? 14 x 1.5 is whats on the invoice
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2 RSA for sale. 7/32 good tread. berks county PA

188K on 2014 Blue Ray Metallic 2LTZ with 19s and nav. sadly new trans at 140K. Used to own 1995 DCM SS with only 260K!
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post #2 of (permalink) Old 03-31-2019
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So long as the nut has enough lip to secure the rim, they should be fine, the size of the socket to tighten them is not really significant so long as you and whoever else takes them off knows it is not the standard. Assuming the thread was ok. Would be sure to torque them down good and while I usually don't use a torque wrench on my lugs I probably would in this case and recheck them a few days after running them.

My 6 year constantly asks why. What adults can learn from 5 and 6 year olds, to listen with your ears and mind open. Hard to learn when you don't listen ......
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post #3 of (permalink) Old 04-01-2019 Thread Starter
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i would hope any mechanic would realize its different and not strip them. i have an impact wrench with 100 torque stick i use when i rotate myself and complete set of sockets so would just have to change it out when i do stuff on the rear. may as well put all 10 on the 2 fronts. unsure id wanna spend another 30 bucks to put these on the rear though. unless the old ones expand too. the lip looked good to me but maybe someday ill put one on and post the pic

i guess i could also see online if theres a 7/8 solid one as well. unsure napa would take old back after a month though.

2 RSA for sale. 7/32 good tread. berks county PA

188K on 2014 Blue Ray Metallic 2LTZ with 19s and nav. sadly new trans at 140K. Used to own 1995 DCM SS with only 260K!
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post #4 of (permalink) Old 04-01-2019
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the concern i'd have is if your car ended up at a shop the "mechanic" (i used quotes because that term seems to have a loose meaning depending no the shop you're at) working on your car wouldn't notice two sets of different lug nuts and used the wrong socket on the fronts vs rear. if they're all the same size then it takes the guess work out of it.

also as long as the lug nuts have a good amount of shoulder holding the wheel on you should be ok i'd think. once you get one one and torqued down i'd probably do a drive around and check for movement during your test drive.
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post #5 of (permalink) Old 04-01-2019
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Quote:
Originally Posted by luckydriver View Post
14 x 1.5 is whats on the invoice
14x1.5 sounds like the stud diameter and thread pitch (in mm) and not the wrench size. If the new nut screws on without binding and has the proper cone shape on the end, it should work just fine.

That said, maybe just use it as a temporary fix and keep looking around for an exact match. Maybe take off a stock nut and go to the salvage yard to get one that matches, or go to the dealer.

The point is, use the new one for now, but eventually swap it out for one that matches exactly. That way you don't have to worry about some guy at the tire store putting an impact on the new one and rounding it off. Or you doing it accidentally.

Doug

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why would i want to buy the original lugs only to repeat this issue again? i thought the idea of buying solid ones would resolve this issue given i was told the originals expand when water gets in them . which i truly never knew was a thing.

2 RSA for sale. 7/32 good tread. berks county PA

188K on 2014 Blue Ray Metallic 2LTZ with 19s and nav. sadly new trans at 140K. Used to own 1995 DCM SS with only 260K!
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post #7 of (permalink) Old 04-02-2019
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Think they would be fine, like Joe mentions just match them all up so as to not confuse the master mechanics at the shops.

My 6 year constantly asks why. What adults can learn from 5 and 6 year olds, to listen with your ears and mind open. Hard to learn when you don't listen ......
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post #8 of (permalink) Old 04-02-2019
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Supposedly the Epsilon body Impala uses popup head acorn lugs nuts with 14mm x 1.5mm threads and a 22mm hex.
22mm is 0.8661" and 7/8" is 0.8750". That's a difference of 0.0089".
That doesn't sound like much til one gets stuck hard... put enough force on the wrench with a slightly too big socket and you could crack even a good socket and round off the corners of the hex. 12point sockets are really bad about this. Even tho you can likely get away with using a 6-point 7/8" socket I would not recommend it. The additional space puts stress on the socket and the nut.

The thread diameter and pitch match. As long as the conical face mates with the wheel properly they will hold the wheels on the car.

You didn't say if you got all 20 lugs or just a few. Personally I don't like having two different "socket size" lug nuts on my vehicles. If you don't have all 20 I'd go back and buy enough to make up a full set. And for goodness sakes find out what size the hex is on those new lug nuts and buy a Metric 6-point socket that fits them properly.
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post #9 of (permalink) Old 07-26-2019 Thread Starter
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since i rotated my tires i compared new and old (if you recall i actually did physically try one in the NAPA lot to make sure it screwed on but i didnt analyze the dimension)

since they look so different im thinking i hope napa takes them back
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2 RSA for sale. 7/32 good tread. berks county PA

188K on 2014 Blue Ray Metallic 2LTZ with 19s and nav. sadly new trans at 140K. Used to own 1995 DCM SS with only 260K!
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post #10 of (permalink) Old 07-26-2019
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Quote:
Originally Posted by luckydriver View Post
since i rotated my tires i compared new and old (if you recall i actually did physically try one in the NAPA lot to make sure it screwed on but i didnt analyze the dimension)

Since they look so different I'm thinking i hope NAPA takes them back
The taper doesn't look that different in the pictures. That's the part that actually holds the wheel on.
As long as the taper on the new lugs covers the area of the cone that the old lugs hit you're good to go.

The NAPA lug is longer... Too short is bad. Longer is just fine. The length of the acorn is non critical as long as there's enough room for the wheel stud inside the acorn with the lug nut bottomed against the wheel lug taper seat.

Again... I'd make sure all 20 lugs are one or the other. I wouldn't mix em.

2009 Impala SS
"Speed never killed anyone. Suddenly becoming stationary... that's what gets you." Jeremy Clarkson
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