Bob Suffolk
Bob Suffolk Answered:

Structural Engineers Association (www.seaint.com) publishes a table of standard threaded fastener callouts for virtually all structural work.  That will include high-pressure pipes that utilize flanges, girders, and frame components where we need specific characteristics in shear, tensile, and break strength.

In general, call out a fine thread if vibration is the worse of your problems, coarse thread if elongation (stretching) is the enemy you must defeat, and work between where you have other hassles to resolve.

Remain consistent throughout the project.  If you wish to see fire erupt from a steelworker's ears, merely have two pitches of thread or two sizes of nut or bolt on the same item.  These guys have every right to throw rocks at you if you make the wrong callout -- and I will hand them the rocks.

If you have moving parts, the Society of Automotive Engineers (www.sae.org) has done virtually all the R&D for you.  They go a bit farther than SEA in that they give you the actual formula for your callouts.  However, as before, consistency is the key.  The difference is that auto mechanics are accustomed to carrying five size wrenches on a garage floor, where structural mechanics are up 20 stories and for some peculiar reason may object rather strenuously to climbing back down to get another size wrench.

Obama's program is not working. That is why you aren't, either, or soon won't be.
Comments (7) Add your own answer
Liked this answer? Tell your friends about it

7 Comments About This Answer

Add your comment
 
Anonymous
Anonymous Comment

Rocmike I see you have posted under your aliases Suffolk and Ladydarko so far. How many others are we in store for?
 
Anonymous
Anonymous Commenter Thinks this answer is Helpful:

More racist hatemongering from Tadpole.  Do you racist hatemongers realize that you are all utterly stupid?
 
Anonymous
Anonymous Commenter Thinks this answer is Helpful:

I heard about Tadpole being busted hate mongering again.  Stupid whore, I wonder is she knows about anything better?
 
Reginald Harper
Reginald Harper Thinks this answer is Helpful:

So, when did dfrogpong become a registered professional engineer?  It seems that she is merely a simpleminded leftist hatemonger.

 

As to which thread has the highest strip strength in mild steel, the answer is the coarser of the two threads.  However, the difference is only a small percentage, as coarser threads cut more from the bolt, leaving it weaker and more likely to snap, and the finer thread is more likely to suffer stress deformation.

 

Either way follow your engineering guidelines.
 
Anonymous
Anonymous Comment

Rocmike aka American Patriot is starting today's posting Marathon with John Wilson, Reginald Harper, Serenity, Mike Weaver and Renner and Anonymous at 5.30 pm est. We are in store for hour and hours of alias after alias of this idiot repeating the same thing over and over and going to old questions and answers. It seems to have stopped posting at 3.30 am est.
 
The man without a name
The man without a name Thinks this answer is Helpful:

Engineering guidelines come with every company and may differ markedly.  Bechtel insists on as close uniformity as possible in all fasteners whereas Henderson Engineering sets selective fastener requirements per project.  IH-Solar scoffs at Behtel in their powerplants construction: they adhere strictly to FAA, which makes sense.

 

Maybe if we engineers got together and told the Who's Who of the profession we are all going to do it one way, then we'd get a lot more done!
 
Anonymous
Anonymous Comment


Rocmike aka American Patriot has started today's posting marathon at 2.00 pm est with Anselmogx, anonymous and Ladydarko Mark Traina and now back to Anselmogx, Glen Wilson and then Dave Palmer now anonymous. It is still posting at 4.30 am est. We are in sore of hours and hours of alias after alias repeating the same thing over and over and going to old questions and answers. Rocmike is also Mark Traina.

Add Your Comment (or add your own answer)
Insert: