6 Comments

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  Takumi

  6 years ago

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  A bit late for the comment, but just wanted to confirm as a Japanese that Andrew and Rocco's right; the said bolts are to be manually expanded after the bolt is fit in place by tightening the inner slug. So the length of a hole doesn't have to be the same as that of the bolt.

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  Rocco Florimonte

  7 years ago

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  I don't read Japanese, but I think what is shown here are two examples of the same concept- that is, that the plug is forced into the split end of the bolt by the tightening of a small allen screw.
  
  In the bottom photo, F-1, it is pretty obvious that an allen screw sits in the head of the bolt and extends all the way through the bolt and threads into the expanding plug. Allen tightened, plug pulled into bolt, threads expanded.
  
  In the top design, F-2, the same concept seems to be done in reverse- the allen screw is mounted in the expander-plug, runs through it and threads into body of the bolt.
  
  On the Lock'n Bolt website it does look like there are types (F-3, F-4) that seat when bottomed-out. Those do seem like a one-way trip, and make me think of the one-way screw heads used to hold bathroom stalls together.
  
  In one of the technical drawings it seems they are indicating using the set-screw/plug combo on a threaded stud. I think THAT is a great idea, because wouldn't it be nice if your cylinder head or manifold studs stayed put when you wanted them to, but could come out when they needed to, without having to lock two nuts together?

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  Nick

  7 years ago

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  Agree with Andrew. It appears this would only work with a blind hole?

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  Speed

  7 years ago

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  "as far as we can tell, the design requires the bolt's length be precisely calibrated to the depth of the hole in order for the head to meet flush with the surface."
  
  
  In the last two drawings it appears that a second screw/bolt inside the first can be tightened (in the first case using a blade screw driver, in the second an Allen Wrench) to flare the bolt end -- sort of the way a Cherry or pop rivet works.
  
  I agree that this is most appropriate for a production environment where speed and reliability make up for the expense of the fastener. In any case, it is not a fastener that could be easily removed.
  

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  Andrew

  7 years ago

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  If this bolt is designed for a blind hole, it would not need a nut in the first place. Title is a bit misleading.

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  Ken J

  7 years ago

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  One thing easily overlooked is cost. This solves a problem that doesn't exist. Not only is the individual cost of this hardware prohibitive but the installation labor is now doubled to boot. Just get screws pre-coated with a thread-locker.

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