Concours Owners Group (COG) Forum

Concours Discussion (C10 / ZG1000 / 1000GTR) => Concours C10 / ZG1000 General Chat and Tech => Topic started by: EZ on July 31, 2018, 01:11:15 pm

Title: header nuts
Post by: EZ on July 31, 2018, 01:11:15 pm
Does anyone have a source for the 8mm fugi header nuts? Amazon is out - Fastenal, Grainger .... no joy.  Found one source but I really don't want to spend $48.00
Title: Re: header nuts
Post by: turbo-max on July 31, 2018, 01:57:15 pm
how many do you need? im sure i have a few used...sending a PM also
Title: Re: header nuts
Post by: EZ on July 31, 2018, 02:36:03 pm
Thanks TM. Just realized this was in ZG 1000 not 1400, where it should be. If its not moved in a day or so I'll re post there..
Title: Re: header nuts
Post by: MAN OF BLUES on July 31, 2018, 06:54:38 pm
I figured that, I'll note a mod to move it, so check there later...
in the meantime, these are what work, and cheaper...

Exhaust Header Nuts (Replacements) -
McMaster-Carr 93795A230 M8.0 Oval Lock nut.  Use with stainless steel washers.
(Note:  The 2010 Service Manual shows the required torque @ 13ft/lbs.)

My personal opinion tho, working and specifying fasteners and torques and such, is that trying to achieve a 'torque' rating on a 'deformed' style lock nut, is nullified by the force it takes to simply tighten it on the threads, so I suggest just prudent 'good-n-tite' without bending the flanges.

best of luck, :great:
Title: Re: header nuts
Post by: EZ on July 31, 2018, 09:32:55 pm
I love it! I knew you'd come through if I posted it here  :truce:
Cheaper and works well, say no more. That's a done deal and as always this cat appreciates your input Rich!  :beerchug:
Title: Re: header nuts
Post by: MAN OF BLUES on July 31, 2018, 11:50:37 pm
I have not used the nut I noted, on the header studs, so I caution about their usage, being as they are a higher strength rated nut... just be careful and don't strip the studs...
In applications where lock nuts are removed maybe twice in the life of the machine, I don't worry; but in cases where more removals are required periodically, I worry they may at some point, damage the threads as they do squeeze the threads during the deformation process on the nut.

My personal opinion is to use a 'Keps' style (captive star washer), which are quite good at resisting the nut from backing off, without possibility of thread damage...
https://www.mcmaster.com/#metric-nuts/=1dyj1l1 (https://www.mcmaster.com/#metric-nuts/=1dyj1l1)

or even 'serrated flange' nuts, which allow use without the need of a flat washer under them...
https://www.mcmaster.com/#metric-nuts/=1dyj5fo (https://www.mcmaster.com/#metric-nuts/=1dyj5fo)

both types in my book, work well, and are common industry standard for things like this.
and, comparably priced.