Pin drive bolts splitting Help Please

[David Kirkham]

Originally Posted by 427PMS

Those do look good .If your going to make a batch I would be interested in a set of 20 for my car .

Chris

Chris,

Which type do you need? Tapered? (What angle). Length? Flat? Let me know and I'll work up a price on Monday when I can call the metal supplier.

David

[Blas]

David,
I have a new Trigo rim sitting in my garage if you need a reference for holes and I have the Trigo pin tool if you want to check a 5 pin fit-up. (Amazing the stuff you find in a clean garage... ) Everyone should also remember that Superformance cars only used Trigo rims early on. First they had steel wheels with fake hubs, then Trigo's and then WAW's. I don't know if the pins are all the same, (Dia and length) but I do know for sure that the spinners are different on Trigo and WAW rims...
edit:
I looked it up:
up to 300ish - steel wheels
300ish to 800ish - Trigo wheels
800ish and up - WAW wheels

I also find some notes about the taper angle changing from the early pins to the newer pins...quote...
"...early stud-bolts (green/brown) with the 1/2" allen-key tended to warp and expand, the later ones (silver) with the 12mm key seem not to be parallel looking at thread and barrel, plus the taper is not the same as the one on the adapter. no matter what you torque, it is prone to loosen..."

Interesting old thread on CC in "Shop Talk" area - search Trigo Pin - then read "Trigo pins binding" thread...

[Dominik]

Yes,
the problems have been around since years. The nuts which have been used were merely a band-aid. Wheels sticking, nuts cracking, warping...

The nut issue should be solved. It's only a matter of stud length and thread (for BMW suspension cars).

Unfortunately, that is not the end of the knock-off wheel problems.

Taper angle from the wing nut and wheel also seem to be different, causing seizure.
In my opinion the thread of the nut should also be more loose to allow the nut to center in the wheel, and not on the thread causing it to seize (and brake when trying to knock off)

There are also tolerances that add up in a very non-beneficial way some time. Like centering of the adapter on the hub, and then getting clamped by the taper of the nuts.
Trying to "center" the adapter once more.

Maybe we can catch the manufacturer's attention to look into that some time...

Wheelcraft/Vintage has their own solution, allowing a lot of play between nut and hole in the wheel. Their multi PCD adapter with 10 holes is suitable for BMW, Merc, FORD and Chev (Jag). Metric PCDs and Imperial are off by a couple of tenths.

Dom

[427PMS]

Originally Posted by David Kirkham

Chris,

Which type do you need? Tapered? (What angle). Length? Flat? Let me know and I'll work up a price on Monday when I can call the metal supplier.

David

David ,
I have the same Trigo pins as in your picture
chris

[David Kirkham]

Thanks!

David

[David Kirkham]

Gents,

Ok, I finally finished the quote.

Here it is.

We can do the pins (like in the CAD drawing above) for $10 each. The cost is driven by the high cost of the raw material and the heat treating. There is quite a bit of handling involved to make a really nice part. I don't think the pins that you guys have are heat treated from what I can gather--but I would have to check the hardness on one to know for sure.

First 10 SALE:

For the first 10 CC members who purchase a set of 20 each, I will sell them for $7 each.

Now, I need to add:

We need 10 sets ordered before we can start the run so it is cost effective to do the programming, set up and first run. So, the 10 sets have to be all the SAME set! For example. 10 sets of the Trigo type with the taper on them--1/2-20 thread.

We will also extend this sale to 10 sets of the Vintage type (which from my understanding is flat--no taper--and has an M12 thread.

If I am wrong LET ME KNOW!

Production will begin after 10 sets are ordered and I confirm the angle from CNG's adapter.

David

[Silverback51]

Originally Posted by David Kirkham

Gents,

Ok, I finally finished the quote.

Here it is.

We can do the pins (like in the CAD drawing above) for $10 each. The cost is driven by the high cost of the raw material and the heat treating. There is quite a bit of handling involved to make a really nice part. I don't think the pins that you guys have are heat treated from what I can gather--but I would have to check the hardness on one to know for sure.

First 10 SALE:

For the first 10 CC members who purchase a set of 20 each, I will sell them for $7 each.

Now, I need to add:

We need 10 sets ordered before we can start the run so it is cost effective to do the programming, set up and first run. So, the 10 sets have to be all the SAME set! For example. 10 sets of the Trigo type with the taper on them--1/2-20 thread.

We will also extend this sale to 10 sets of the Vintage type (which from my understanding is flat--no taper--and has an M12 thread.

If I am wrong LET ME KNOW!

Production will begin after 10 sets are ordered and I confirm the angle from CNG's adapter.

David

What grade of stainless material and what hardness for the heat treat?

[David Kirkham]

17-4 Ph H900

[butz999]

I have brand new vintage wheels and adapters my pins are tapered just like a standard lug nut,are they different styles?