Q: Looking for source for this unusual fastener
Jon Juhlin
the thing for a particular application where a bolted connection needs to be
cinched up once and provide a connection that can't be disassembled.
The joint I observed used a 3/4" unc bolt that appeared to be nothing out of
the ordinary. But the nut was a conical affair that is either crimped on or
pressed on in a way that the threads of the nut are damaged during the
pressing process such that the nut can't be removed. The appearance of the
device suggests that is pressed on rather than crimped, but is in a tight
spot where I can't see.
I saw them used in a hinged connection on a floating boat dock, where the
bolt served as the pin in the hinge between dock sections. The attractive
part of the conical non-removable nut was that it discourages fun loving
local teenagers from disassembling the dock and sailing away on the
disconnected sections. Indeed I have been asked to make repairs to the dock
after just such an attempt was foiled by these handy devices and the
miscreants decided to vandalize the dock as a way of teaching it a lesson.
I need to take the dock apart but would like to reassemble it with these
handy gadgets.
I assumed it was made by Huck fasteners because it appeared to be distantly
related to a Huck bolt other than it was not as heavy duty and could be
installed in tight quarters where a Huck gun could not go.
Any suggestions on where I could find this would be appreciated. I tried
Fastenal, but they do not list this device.
Jon Juhlin
dlzc
On Nov 4, 8:33 pm, "Jon Juhlin" <j_juh...@efn.org> wrote:
...
> The joint I observed used a 3/4" unc bolt that
> appeared to be nothing out of the ordinary. But
> the nut was a conical affair that is either crimped
> on or pressed on in a way that the threads of the
> nut are damaged during the pressing process
> such that the nut can't be removed.
Probably better to look for "tamper proof fasteners", such as:
http://www.tufnutworks.com/category.aspx?id=1
Other options might be:
1) left hand threads (it sure gets me...)
2) drill through the bolt behind the nut
3) two sledgehammers, one on head of bolt, one peens the threaded end
over.
4) explosive bolts...
David A. Smith
brian whatcott
http://www.tufnutworks.com/category.aspx?id=1
Spanner nut?
http://www.hudsonfasteners.com/security.htm
Brian W
