Do you know about stainless steel double head screws?

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stainless steel double head screws are used to connect mechanical fixed link functions. Double-headed screws have threads at both ends and the middle screw, either thick or thin, also called double-headed bolts or studs.

 

The assembly method of stainless steel double head screws is to screw the short end of the thread into the base, pay attention to the screw until near the smooth rod, by adding two nuts in the longer end of the thread. Remove the double nuts and insert them into the cover. Then put the washer on the screw and tighten the nuts. Note that when the double nut is inserted to tighten the thread end of the machine base, the two threaded nuts can only be screwed into the middle of the thread length, using two wrenches. After the screw is tightened, take out the upper and lower nuts one by one with a wrench.

stainless steel double head screws used in the main body for large equipment, the need to install the accessories, such as sight glasses, mechanical seal, deceleration machine frame, etc., this is just used in the double screw, one end of the screw in the main body, at the other end after installed accessories carry nut, because the attachment is often removed, the thread will wear or damage, use double thread replacement will be very convenient. When the thickness of the connecting body is very large and the length of the bolt is very long, the double-headed screw will be used. Used to connect thick plates and inconvenient hexagonal bolt connection, such as concrete roof truss, roof beam suspension monorail beam suspension parts, etc.

 

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kalyn

NC Wayne

07-27- 19:34:01

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 Re: Question about double nuts in reply to Bernie in MA, 07-27- 17:33:06   Putting a lock washer between them makes double nutting them useless. I don't know the exact way to describe it but I'll try...Using two nuts together makes the chance of them coming off less due to the friction between the faces of the two nuts (one against the surface, and a one aginst each other) as well as between the threads of the nut and whatever it's on. Basically you've got 4 individual joints acting together to keep the nuts tight. A lock washer, when it works properly, is supposed to become tensioned when you tighten the nut and dig into both the nut and the surface it was tightened against to prevent it from backing off. It's a common thing to see done, but in reality using a lock washer and a flat washer together makes the lockwasher usless. If the nut tries to loosen the flat washer will not dig into the surface and can turn right along with the nut, because the lock washer locks the two of them together instead of the nut to the surface. That said if you use a lock washer between the two nuts you lose the friction lock between the two nuts in exchange for the "locking" action of the lock washer which is gonna try to keep the outer nut tight by digging into the inner nut. In this case if the outer nut decided to back off then the inner nut would be "locked" to it and would tend to try to back off also....and you'd still need to tighten the outer nut just as tight to keep it "locked" in place with the other nut. I understand what your talking about having to wrench a Nylock nut for a distance, that isn't any fun. Have you tried a internal/external star washer (one that has the serations both internally and externally) along with just a single nut? They tend to dig in and hold better, in many applications, than a regular lock washer because the grab on in multiple places around both the ID and OD of the fastener.. If you used one of them and also did like another post suggested and use some of the blue Locktite at the same time it might help you out some. Good luck.

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