18-8ss screw binding
18-8ss screw binding
(OP)
Hello great knowledge of this form,
I have run into a interesting problem, and would like your input. For a project I am using 1/4"-20 18-8ss bolts that are connected to 18-8ss nylon insert lock nuts. The issue that has be seen is that sporadically the nut will lock up while I am trying to tighten up the screw. and it locks up about 1/4 down the length of the screw. after that, it will not move forward or backwards. Because of this, I have resulted into cutting the bolt and putting in a new one.
My guess in to what is happening, is that as the nut is moving down the bolt. some inconstancy are rubbing onto the thread of the nut or bolt causing some metal to shear off and causing it all to bind up. pretty much the screw material is too soft and being "machined" off inside the screw thread. that is my best guess.
so any ideas what could be happening.
I have run into a interesting problem, and would like your input. For a project I am using 1/4"-20 18-8ss bolts that are connected to 18-8ss nylon insert lock nuts. The issue that has be seen is that sporadically the nut will lock up while I am trying to tighten up the screw. and it locks up about 1/4 down the length of the screw. after that, it will not move forward or backwards. Because of this, I have resulted into cutting the bolt and putting in a new one.
My guess in to what is happening, is that as the nut is moving down the bolt. some inconstancy are rubbing onto the thread of the nut or bolt causing some metal to shear off and causing it all to bind up. pretty much the screw material is too soft and being "machined" off inside the screw thread. that is my best guess.
so any ideas what could be happening.





RE: 18-8ss screw binding
RE: 18-8ss screw binding
RE: 18-8ss screw binding
http://www.mcmaster.com/#antiseize-lubricants/=wri...
RE: 18-8ss screw binding
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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
RE: 18-8ss screw binding
With a 1/4-20 UNC nylock nut there is probably only about 2.5 to 3 metal-to-metal thread pitches engaged before the nylock insert comes into contact. Sometimes it can take a fair amount of torque to force the bolt threads past the nylock insert.
As a quick test, try running a plain 1/4-20 UNC CRES nut onto the bolt to see if the same problem occurs.
RE: 18-8ss screw binding
http://www.nickelinstitute.org/~/Media/Files/Techn...
See table XI on page 24.
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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
RE: 18-8ss screw binding
RE: 18-8ss screw binding
RE: 18-8ss screw binding
RE: 18-8ss screw binding
RE: 18-8ss screw binding
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: 18-8ss screw binding
RE: 18-8ss screw binding
RE: 18-8ss screw binding
But later, when unscrewing, the black oxide will have scratched through, and the galling will re-appear.