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Old 11-29-2015, 12:20 PM   #21
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Originally Posted by nomad297 View Post
I understand this much, but what I am more interested in is at what TPI a bolt goes from being a coarse thread to a fine thread. It seems like there must be a gray area and the difference is mainly left to one's opinion.

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I believe course/fine threads are determined by number of threads per inch for identical bolts/nuts. So, not really a gray area (specification drawings) and not necessarily one's opinion. However; for what it's worth, this is my opinion. Remember, everyone has one.
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Old 11-29-2015, 12:38 PM   #22
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Lug nuts are course. Not a lot of threads. Fine threads would be something screwing into a soft material, Plastic, aluminum. Many lose together threads. Go to a hardware store and a clerk to show you what they look like!
This is incorrect; Lug studs and nuts are fine thread............
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Old 11-29-2015, 12:54 PM   #23
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Originally Posted by bubbles View Post
I believe course/fine threads are determined by number of threads per inch for identical bolts/nuts. So, not really a gray area (specification drawings) and not necessarily one's opinion. However; for what it's worth, this is my opinion. Remember, everyone has one.
This is pretty much what I already stated. Only, I abbreviated "Threads Per Inch." I appreciate your opinion, hovever.

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Old 11-29-2015, 12:56 PM   #24
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Originally Posted by dannyabear View Post
This is incorrect; Lug studs and nuts are fine thread............
You see? This is EXACTLY what I am talking about. One guy says it is coarse and the other guy says it is fine. Where is the defining thread count threshold that takes opinion out of the equation?

Bruce
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Old 11-29-2015, 04:29 PM   #25
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nomad297,
Your question was actually answered in post #14. Without entering into metric issues and specialty items, bolts are normally made with UNF and UNC threads. The width of the bolt determines how many TPI. It is all about the pitch of the thread. Here is a link to a bolt manufactures chart that takes all of the "opinion" out of the equation.

http://www.portlandbolt.com/technica...d-pitch-chart/

Armed with all that data you must now arrive at the conclusion that it is the application that is the determining factor for all of the variables a bolt can have.

This link is for how far we have strayed;

http://youtu.be/xCc-RWIp7XU
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Old 11-29-2015, 05:40 PM   #26
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Duckogram, thank you for that chart. It really makes me understand the difference.

Now, can you tell me which thread is on a lug stud?

Bruce
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Old 11-29-2015, 05:56 PM   #27
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Fine thread.
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Old 11-29-2015, 08:22 PM   #28
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Originally Posted by nomad297 View Post
Duckogram, thank you for that chart. It really makes me understand the difference.

Now, can you tell me which thread is on a lug stud?

Bruce
You are welcome and yes, I can tell you which thread is on a lug stud but only if you can tell me the application.
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Old 11-30-2015, 02:36 PM   #29
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I got a letter a couple of weeks ago. Took it into my local dealer who had to order parts. Looks like everything is in and they are fixing the recall this week.
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Old 12-04-2015, 03:08 PM   #30
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I called FR about the recall and told them the owner of the company I bought my motorhome from was a crook and probably will have to spend some time in jail. He said any authorized RV repair place that they deal with could do the recall.
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