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65Likes
06-26-2018, 09:43 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,889
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Not Ranked
Note that the little two-pager I posted recommends NAS 6303 Series High Temperatuer Alloy Hex Bolts for your brake hat, coat, and walking stick.
"Identical in external configuration to the NAS 6203 series bolts listed above. Made from A286 stainless steel alloy, rated for 1200°F operation. Minimum tensile strength is 160,000 psi; minimum shear strength is 95,000 psi. The brake hat bolt of choice for all serious race cars."
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06-26-2018, 12:43 PM
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CC Member
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Join Date: Apr 2005
Location: Tucson,
AZ
Cobra Make, Engine:
Posts: 5,389
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Not Ranked
What I ordered was AN6-10A bolts. Five per hub on the front. They fit perfect!
Larry
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Alba gu brąth
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06-26-2018, 02:03 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,889
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Not Ranked
Quote:
Originally Posted by LMH
What I ordered was AN6-10A bolts. Five per hub on the front. They fit perfect!
Larry
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Unless you're driving like Morris, aircraft spec bolts will probably do you just fine. And you'd probably have smoke coming out of your wheel well before you could heat damage the AN bolts anyway. Personally, I pull her over when I see smoke, steam, etc. coming off her....
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06-26-2018, 02:15 PM
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CC Member
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Join Date: Apr 2005
Location: Tucson,
AZ
Cobra Make, Engine:
Posts: 5,389
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Not Ranked
Drive like Morris?!
Actually that’s what fits the holes in the hub. Wire wheel car. I’m not worried!
Larry
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Alba gu brąth
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06-26-2018, 02:22 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,889
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Not Ranked
Quote:
Originally Posted by LMH
Drive like Morris?!
Actually thats what fits the holes in the hub. Wire wheel car. Im not worried!
Larry
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The way I drive you could probably rest your hand on the hat with no trouble -- I could get by with plastic zip ties instead of the hat bolts.
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06-26-2018, 05:53 PM
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CC Member
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Join Date: Dec 2003
Location: Gurnee,
IL
Cobra Make, Engine: Kirkham #259
Posts: 1,393
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Not Ranked
Quote:
Originally Posted by patrickt
Unless you're driving like Morris, ...
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Are you saying Im a terrible driver???
__________________
Morris
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06-27-2018, 02:09 PM
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CC Member
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Join Date: Apr 2005
Location: Tucson,
AZ
Cobra Make, Engine:
Posts: 5,389
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Not Ranked
FYI, per the manufacturer, genuine Aerotight steel nuts (non stainless) are grade 8 strength nuts.
Larry
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Alba gu brąth
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06-27-2018, 05:19 PM
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CC Member
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Join Date: Mar 2009
Location: Mendota,
IL
Cobra Make, Engine:
Posts: 693
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Not Ranked
Anyone have a place to get Aerotight nuts that would have 7/16 20? I need some for the pins to the rear uprights. I made the pins with this thread on the ends.
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06-27-2018, 07:24 PM
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CC Member
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Join Date: Apr 2005
Location: Tucson,
AZ
Cobra Make, Engine:
Posts: 5,389
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Not Ranked
I bought nuts as well as other things from British Fasteners. https://britishfasteners.com/
Larry
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Alba gu brąth
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06-27-2018, 07:59 PM
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CC Member
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Join Date: Dec 2015
Posts: 1,442
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Not Ranked
The standard MS21042L-7 (Cad plated) has been replaced by NASM21042 for Nut sizes of to -6
Larger -7 and up are covered under NAS1291-7 (Cad plated).
Available from pretty much any aviation supply house. Aviall, Duncan, etc....
http://www.coastfab.com/uploads/4/1/...291_rev_13.pdf
https://datasheetspdf.com/pdf-down/N...M21042-AIA.pdf
A safe vendor to by from: (safe meaning everything comes with FAA 8130-3 forms for traceability. No chance of getting Chinese counterfeit hardware)
NUT NAS1291-7
Mom and Pop hobby shops like Skygeek are sketchy on stocking levels.
Last edited by spdbrake; 06-27-2018 at 08:10 PM..
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06-27-2018, 09:27 PM
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CC Member
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Join Date: Mar 2009
Location: Mendota,
IL
Cobra Make, Engine:
Posts: 693
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Not Ranked
So far I have not been able to find 7 /16 20 aerotite nuts. Does anyone know if they available in this size.
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06-28-2018, 07:09 AM
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CC Member
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Join Date: Apr 2005
Location: Tucson,
AZ
Cobra Make, Engine:
Posts: 5,389
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Not Ranked
Aerotight fasteners were developed for the aircraft industry. Most fasteners used throughout Cobras were from the aircraft industry.
7/16 UNC/UNF are advertised here: https://www.fastenright.com/general-...ight-nuts/sl01
Larry
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Alba gu brąth
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06-28-2018, 07:43 AM
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CC Member
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Join Date: Oct 2004
Cobra Make, Engine: CSX2321
Posts: 1,368
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Not Ranked
Quote:
Originally Posted by LMH
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The original bolt/pins are 7/16 - 18 BSF and Aerotight nuts for those will be somewhat scarce.
Last edited by A-Snake; 06-28-2018 at 07:46 AM..
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06-28-2018, 08:01 AM
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CC Member
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Join Date: Dec 2015
Posts: 1,442
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Not Ranked
Possibly in in the 1950s they were. If they had a Spec (MIL, NAS,MS, etc..) assigned to them they could be used in a Aerospace or Military application.
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06-28-2018, 08:08 AM
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CC Member
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Join Date: Apr 2005
Location: Tucson,
AZ
Cobra Make, Engine:
Posts: 5,389
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Not Ranked
Quote:
Originally Posted by A-Snake
The original bolt/pins are 7/16 - 18 BSF and Aerotight nuts for those will be somewhat scarce.
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Yeah, I know. I was posting for MAStuart for his car.
They are advertised here btw but Ive never bought from them: https://www.arunfasteners.co.uk/stoc...-locking-nuts/
Larry
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Alba gu brąth
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06-28-2018, 08:35 AM
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CC Member
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Join Date: Jun 2007
Cobra Make, Engine: SPF GT40
Posts: 236
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Not Ranked
Quote:
Originally Posted by Morris
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Actually you're a damn good driver Morris. I remember you well from C Production days driving Datsun 280Z's.
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06-28-2018, 08:41 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,889
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Not Ranked
Quote:
Originally Posted by SwiftDB4
Actually you're a damn good driver Morris. I remember you well from C Production days driving Datsun 280Z's.
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Uhhhh, I dunno about that. I saw an interview a couple of weeks ago with the "wives of NASCAR drivers" and each one of them said that they did the family vacation driving themselves because their husbands could not pay attention to the road consistently when only driving 60mph.
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06-28-2018, 06:08 PM
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CC Member
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Join Date: Dec 2003
Location: Gurnee,
IL
Cobra Make, Engine: Kirkham #259
Posts: 1,393
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Not Ranked
Quote:
Originally Posted by SwiftDB4
Actually you're a damn good driver Morris. I remember you well from C Production days driving Datsun 280Z's.
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Did I race with you in the early days....??
Thanks for the nice words...I was obsessed in my younger days.....now I’m much more mellow and slower in my new life.....but I still build things to the best of my ability....and am trying to share as much knowledge as I can to help others.....
__________________
Morris
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06-29-2018, 08:19 AM
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CC Member
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Join Date: Jun 2007
Cobra Make, Engine: SPF GT40
Posts: 236
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Not Ranked
I was usually a backmarker, but I did finish second to your first in the 1981 June Sprints. I did several IMSA races with Jack Buchinger in 280Z's. You might remember him.
Dave Miller
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