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Offline earthman

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Re: Rear Wheel Studs - Dimensions
« Reply #8 on: November 30, 2020, 11:52:10 am »
*Originally Posted by Rick505 [+]
I see that now.  That's what I get when I reply and feel all smug with myself thinking I found the answer.   :431: :034:

No need for the apology I'd say, you were only trying to help, easy to over look that the thread pitch is not the same on both sides of this stud. I have a feeling that one may have to make some of these on a lathe or pay someone else at a machine shop. 

Offline STJIM

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Re: Rear Wheel Studs - Dimensions
« Reply #9 on: December 01, 2020, 01:00:49 am »
Trophied :

When I checked the tightness of the exhaust  manifold nuts recently while doing a valve clearance check,  it looked like those studs are 8 mm, not 10 mm studs used to attach the rear wheel, since it took a 13 mm wrench to fit the exhaust manifold nuts.
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Online trophied

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Re: Rear Wheel Studs - Dimensions
« Reply #10 on: December 01, 2020, 01:22:28 am »
What I was referring to were NOT Trophy exhaust studs, just automotive exhaust studs from a bolt and nut website that happened to have the right thread pitch each end but the length of each thread was not correct and not sure about the strength rating since 8.8 or stainless were all that were listed.
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Offline STJIM

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Re: Rear Wheel Studs - Dimensions
« Reply #11 on: December 01, 2020, 01:56:36 am »
Thanks for the clarification.   Ya, I bet 8.8 grade won't be strong enough since wheel wheel studs seem to be made from hardened steel. 

And after looking at this chart :  https://www.fastenermart.com/files/metric_tighten_torques.pdf  a 10mm x 1.25mm 8.8 grade bolt should be torqued to around 50 Nm  whereas the torque spec for the Trophy rear wheel nuts is 70Nm.  That to me indicates the rear wheel studs are a better grade than 8.8.

But it looks like a 10.9 grade should be OK to use.  The torque spec for them in the chart is around 70 Nm.

But it seems to me most wheel studs are made from hardened steel.  But it looks like the 10.9 grade may be good enough for the Trophy.

BTW,  since I had nothing else better to do and to get get out of the house for awhile, I removed my Trophy rear wheel mounting nuts and applied some copper anti-seize to the threads and then properly torqued them to 52 ft-lbs.
« Last Edit: December 01, 2020, 02:03:13 am by STJIM »
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Offline STJIM

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Re: Rear Wheel Studs - Dimensions
« Reply #12 on: December 01, 2020, 02:43:50 am »
Coconut :

If your luck isn't like mine, these may work : https://arp-bolts.com/kits/arpkit-detail.php?RecordID=5022

depending on if the nut has enough threads available to fully tighten against the wheel and if they are tough enough being S.S.

EDIT : Did some further checking on the ARP website and although these are S.S. they are rated at 180Ksi and should be torqued to 54 ft-lbs / 73Nm.
« Last Edit: December 01, 2020, 03:01:08 am by STJIM »
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Offline Coconut

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Re: Rear Wheel Studs - Dimensions
« Reply #13 on: December 02, 2020, 06:23:14 pm »
I have found an engineering company in the West Midlands ( UK )
that will make these using Grade 8.8 High Tensile Steel,
according to the dimensions posted previously. :152:

There would be a minimum order quantity of 20 Units, priced at GBP £4.05 each + Postage.

If enough Members wanted to buy one, or more, even just to keep as spares,
I would be happy to organise this and place a bulk order, so if you are interested
please send me a Private Message to let me know how many you want,
together with your Postal address - for me to work out the Postage costs.

It probably won't be economically viable to send outside the UK,
and would make more sense to find a local engineering company.

Cheers  :821:


Offline STJIM

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Re: Rear Wheel Studs - Dimensions
« Reply #14 on: December 02, 2020, 08:43:53 pm »
Coconut:

I don't think 8.8 grade is good enough.  They would not be able to handle the 70Nm torque required.  Did you ask them about that ?  They would need to have a tensile strength in the 170/180 KSI range.
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Offline Coconut

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Re: Rear Wheel Studs - Dimensions
« Reply #15 on: December 02, 2020, 08:51:45 pm »
I told them that the Wheel Nuts are tightened to 70Nm
and that is the Grade of steel they specified.

I don’t know enough about the subject to know
whether it is correct or not, but I will query it with them.

Cheers,