TR2/3/3A Coarse Vrs. Fine Knock Offs

[CJD]

Found some new knock off nuts on Ebay. I just received them and learned that there are "coarse" thread and "fine" thread.

I never knew.

The adapters that I have that are worn out are coarse thread. Can you guys let me know if this is standard for our TR3/2's? Just want to make sure I don't get a good deal for a set that I can't use...

 

[6TTR3A]

I've never run across anything but 8 TPI (coarse) on any sidescreen Triumphs, from factory wire splines to anything offered by the big 3 as aftermarket.
Frank

 

[Billm]

Before about 1955 or so there were the fine thread ones (12TPI), after that they went to coarse (8TPI). I have some of each.
BillM

 

[TR3driver]

There may have been some earlier Triumphs with fine thread; but I'm pretty sure the TR2 was introduced with coarse threads. There is no mention in the SPC or any of the restoration articles that I've read about a change in the knockoffs or hubs. Fine threads were used on other cars, though, like MG and Jaguar.

But do note that the knockoffs are "handed". A few TRs may have been fitted with the octagonal "safety" knockoffs as well (but AFAIK only the Stag had them as standard for the wire wheel option).

 

[CJD]

Thanks Frank, Bill, Randall. Coarse is the way to go. That is all I had seen on the triumphs so far, but I got worried that maybe there was more to it.

 

[Marvin Gruber]

Late to the party, away from the computer yesterday. 12 threads on early Healeys, T series MGs and early MGA. Never saw a TR with fine threads.

Marv