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Re: [GMCnet] OEM vs Alcoa lug nuts [message #265807 is a reply to message #265796] Mon, 10 November 2014 15:48 Go to previous messageGo to previous message
USAussie is currently offline  USAussie   United States
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma:
Senior Member
Randy,

The 9/16' x 18 TPI is the correct size and thread pitch, however, the spec says the NAPA nut is 1" high and if you look closely at
the washer you will see it is conical in shape.

Below you will find a photo of an OEM Alcoa lug nut and the washer is not conical:

http://www.southwestwheel.com/store/p-1807-139987.aspx

And the overall height of the nut is not that high.

As you can see from this photo when you install Alcoa wheels on the OEM wheel studs the studs do not go all the way through the
nuts:

http://www.gmcmhphotos.com/photos/for-sale-by-owner/p29996-lug-nut-caps-for-sale-or-trade.html

History has shown that's not a problem, however, installing taller lug nuts would reduce the amount of thread engagement further.

Bottom line: buy OEM Alcoa lug nuts if you install Alcoa wheels.

Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426

-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Randy Meek
Sent: Tuesday, November 11, 2014 7:32 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] OEM vs Alcoa lug nuts

Would this be the correct lug nut for Alcoa wheels?
http://www.napaonline.com/Catalog/CatalogItemDetail.aspx/Wheel-Bolt-Nut-9-16-18/_/R-NDP6412029_0437519255

Randy
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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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