Help w/ Wheel Stud Identification

[914-6gt]

SOMEONE HAS SEEN or USED THESE WHEEL STUDS BEFORE, RIGHT?

For the sake of safety, we're trying to identify the manufacturer and 'quality' (after market, from China, etc.) of these long racing studs.

After a more detailed inspection, we noticed the way the threads end at the bolt shoulder, this raises a bit of concern. Maybe these are in fact the best studs one can buy, maybe not. If I'm going to have issues with these wheel studs, it's best to find out now, not later.

Is anyone familiar with this type of long racing studs? Look at the photo showing the head of the stud and how they're machine into a dome, I'm not familiar with them, there are NO manufacturing markings of any type that I can see and it makes me nervous. If by chance you know where these studs came from, I appreciate your posts and information.

Thank you!

PS: Sorry about the "ruler", couldn't find my metric dial-calipers and trying to provide some idea of the length starting at the hub.

[edmayo]

I've never seen anything like those either, I agree, the end thread looks like a fracture waiting to happen.

[John Straub]

Those are new to me.

John

[914-6gt]

I've never seen anything like those either, I agree, the end thread looks like a fracture waiting to happen.

Those are new to me. John

Thank you for the replies Ed and John and concurring with my concerns. I would still like to identify their manufacturing source if at all possible, maybe 'flag them' if they are in fact an inferior product any one of us should not be using at the track, etc.

'Cudo's' to Berney Buschen for first raising the 'red flag' on this item, and I quote...

"Oh-Oh,

Armando-

Those do not look like factory studs, the machine work looks off and the heads are normally not machined to a dome. Not to mention where the threads end it’s not usually a sharp step (nasty stress riser) but more of a smooth tapered transition from the threaded section to the shank. Any close ups of the bolt head itself, like a proof stamp?

Bernie-"

Armando

[boba]

These studs are avalilble in various lengths, and also available open steel lug nuts. Made by the same supplier to NASCAR teams. These are Porsche fitments.

[Harvey Weidman]

Those look alot like American (1 ton P/U). With the huge heads turned down. Or a Chinese copy of an American truck lug.
H

[JohnT]

My old eyes get tired this time of night, but I'd swear that the threads on the studs in question are SAE "fine" (24/inch). I think I count 6 in the 1/4" inward from the 3" mark on the tape.

johnt

[Harvey Weidman]

Sorry, I ment to say American 14mm truck studs. The difference in threads may be rolled VS cut?
H

[914-6gt]

Those look alot like American (1 ton P/U). With the huge heads turned down. Or a Chinese copy of an American truck lug.
H

Sorry, I meant to say American 14mm truck studs. The difference in threads may be rolled VS cut?
H

Hi Harvey. I agree, the heads of those studs appear to have been turned down, but interestingly enough, they show zero rust which also makes me wonder if they were recently modified by the end user (as opposed to purchased as shown). Are you saying the threads appear "rolled" to you? If so, that would be ideal. I don't yet know if these are 'safe' to use since their origin remains a mystery. Thanks!

[Rolly]

I have a 3" Porsche stud that has marking on the head X NSF X and below that 10K