Another Controversial THREAD that should be LOCKED tight!

[Ramsey_ElWardani]

I hope no one gets cross threaded about this interesting read.

http://www.pirate4x4.com/tech/billav...lts_signed.pdf

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[OldStroppeTeam]

If more people paid attention to the actual point of the article, we wouldn't have as many loose nuts running around. As for studs, well Yes We Are !!!

[Dave_G]

That's a really good article! The only thing I found missing was any mention of "J" designation threads (controlled root radius threads in high strength quality fasteners.)

[FABRICATOR]

It's a lot of good, high-tech information for low-tech fasteners. But he knows just enough about the aerospace stuff to be dangerous.

[ntsqd]

It must be true though, I read it on the Internet.

Actually this whole post is for Ramsey to see how many bad puns he can wrap into one posting.

[Ramsey_ElWardani]

Actually, I was just “screwing” around with the moderators (they know I love them) who are too quick to lock down threads, in my opinion. “Bad puns,” I thought the puns were pretty good!

[ntsqd]

Just razzing you, pretty sure you knew that.

Billavista sure puts a lot of effort into his write-ups. As much as I read on tech topics I always remember Kent Duckworth's advice "Don't read, you become miss-informed." For those who don't know, Duckworth is the "Worth" of Cosworth.

[GOAT1]

It's a lot of good, high-tech information for low-tech fasteners. But he knows just enough about the aerospace stuff to be dangerous.

Care to elaborate?

[therail]

im curious also.

[FABRICATOR]

I try to observe the credo of “If you don’t have anything good to say, don’t say it” but since you asked…

IMHO the author took a bunch of good factual information from reliable sources; threw in some personal opinions, and made it sound like it was his. The more factual and objective parts of the article are borrowed from the cited references, who’s information mostly originated from the 100 or so page Fastener Design Manual from NASA (publication 1228). I checked it out because it looked familiar.

“Bolts, screws, and studs are just a naming convention”. Then why do studs work so much better on engines and many other applications?
“Double shear is almost twice as strong as single shear”? Double shear is usually more than twice as strong as single shear.
“Shear joints are the most demanding”? What does that mean?
“Use of washers is dubious at best”? It sounds like he just doesn’t like washers. Using washers is extremely common with high quality fasteners.
Leverage is a big factor in bolt stress yet there is little mention of it.
There is no mention of the little radius under the head of aerospace bolts, or AN washers that are usually the same size as bolt heads. What could they be for?
There may be some self locking nuts that can be re-used 10 times, but many of the very best aerospace self locking nuts loose a lot of their grip after the second or third use.
It is common to use PLI (preload indicating) washers on aerospace fasteners but it was not mentioned. And it’s not dubious because they use washers anyway.

Unlike many other things, fastener technology is not unique for off-road applications. I will stay with reliable and unbiased sources for such an established science.