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yes but I wanted to avoid all the typical comments that will probably come about bold vibrating loose, because they will be inapplicable to my situation. So i wanted to pose the question just as simple and direct as possible. I cannot use any modified threads, sealer, any rubber, nords-lock...

I didnt realize that increases stretch without increased clamp load would aid for screw vibrating loose. This is really what I am trying to get at, though I have not said it before, Im only dealing with a inch long screw with quater inch of thread engagement so I dont know if Ill realistically...

So I still am trying to understand this concept fully – and will greatly appreciate it if someone can clear it up. If we are looking at the logic that CHEZ provided: “Your only inputs are the friction coefficient and normal force. The additional factor which needs to be considered with a...

Ted, That thinking is in-line my initial thoughts, as you can see in my comments related to Cross Sectional Area --- but The effect is negligible as pointed out in comments above and with what I have witnessed in practice.

chez, Wow, I understand the diam/friction relationship now --- I dont know why that wasnt clicking for me with the other comments.. Without going into much detail -- a Hand powered screwdriver is used, cannot change the screwdriver, but tested a T-handle screwdriver and was able to achieve...

Ted that would contradict what all the other comments above are saying about the Diameters influence due to thread engagement

Guys, These are theoretical examples This is for a specific Biotech application,,,,, below are not in the realm: Applying more torque modifying female threads (thus no change in male thread diam) Lubricant cannot be used material cannot be changed This is handling a very small amount of...

Hey Guys thanks for all the replies, Follow up question, As I have seen in my situation, D has a large impact on the clamping force. AND From the replies I understand that it is due to the frictional force of the threads, due to the increased circumferential contact area (correct me if I am...

Background: A simple relatively accurate formula to relate Torque to Clamp Force is: T = (F)(D)(K). Where D --= Diameter of bolt, T = Torque, Lets ignore K for this. I am encountering a situation where a screw designed like #1 has an appropriate clamp force with the hand toque that we are able...