how to calculate max. load a nut can take?
how to calculate max. load a nut can take?
(OP)
I have a 5" dia. nut with buttress thread on it that threaded to the shaft. shaft and nut materials are same (4130). can anyone guide me through the calculating the max load nut can take before threads stripping out.
Thank you
Thank you





RE: how to calculate max. load a nut can take?
look at this site:- http
desertfox
RE: how to calculate max. load a nut can take?
RE: how to calculate max. load a nut can take?
another site with useful links:-
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desertfox
RE: how to calculate max. load a nut can take?
is these fundamentals are good for buttress threads too?
RE: how to calculate max. load a nut can take?
The references on the Roy Mech site are definetely for Buttress threads, the other site also as a power screw section but I haven't studied it closely.
desertfox
RE: how to calculate max. load a nut can take?
Keep in mind that these threads are stronger in one direction (push or pull) than in the other direction because the angle on the front and backsides of the threadform is different. Used in gun breeches, oilfield tools, aircraft propellers, etc...
RE: how to calculate max. load a nut can take?
See slide number 29 of this lecture:
http://ww
It was always my understanding that, for properly designed ANSI inch-grade fastener designs of equal grades, the stud will fail before the nut.
My recollection is that the strength of the fastener is always governed by the stud.....never the nut stripping strength.
This is reflected in the testing methods for ASTM materials such as ASTM A194. A random sample of nuts are tested to destruction by threading onto a matching stud an applying a tensile force. Acceptable results are failure must always occuring in the stud....no stripping of the nut threads permitted.
I realize that your 5 inch example may be extreme, but I believe that your joint should follow this principal.
-MJC
RE: how to calculate max. load a nut can take?
if they are not absolutely clean threads, that the anti-sieze is uniformly and corretly applies, and if they are not carefully and accurately torques properly iin the peoper sequence EVERY time the joint is taken aprat and put together - all your "assumed" thread pre-loads and metal stresses might as well be thrown in the toilet and flushed.
A bad single thread or galled thread (with too little anti-sieze or too much rust or dirt) will easily mean that your carefully designed stud will only actually carry 1/2 the load that its two neighbors carry.
So its two neighbors stretch - then all three begin to pick up the load, which changes the stresses on their two neighbors outside the orignal three .....
RE: how to calculate max. load a nut can take?
You get a star.
I call them Butt-kiss threads, because you never know when you can kiss your ass good by installing them. The poorest thread choice possible for anything. Acme, or square if 60° is not applicable.
Ed Danzer
www.danzcoinc.com
www.dehyds.com
RE: how to calculate max. load a nut can take?