Arn,
If I remember, the Pem nuts have little teeth around the circumference of the
nut that act like a broach and cut their way in when you use a press to press
them in the hole. The Atlas rivet-nut which Pem makes I think, actually acts
like a pop-rivet in action swelling on the back side of the hole. They also can
be had with a serated body to dig in, a hex body, or have a little key to fit
in a notch then be swaged in. I remember some of this as I used to sell for
Huck. Huck makes all kinds of industrial rivets and the famous Huck bolt. Those
are used by the ton in railroad cars and was who I sold to. They used what was
known as a break-away pintail and a collar. You placed the pin-tail bolt
through the hole and a collar slipped over it on the other side. A Huck gun
slipped over the pintail and up to the collar. The gun grabbed the pintail, and
started pulling forward swaging the coller into the threads of the bolt until
it was fully swedged. Then, the pin snaps off at the coll
ar and is discarded. I saw that they are using these in the front ends of
large trucks and school busses. Once they're on they don't come off unless you
use the special one they have which can be unthreaded. Though you have to use
an impact wrench to do it over the swedged on collar into the threads. The ones
with rings instead of threads have to be split or burnt off. Huck also made
several types of pop-rivets too. I've still got several video tapes here from
Huck on training, and sales demo tapes for the customers.
Best,
Will
*********** REPLY SEPARATOR ***********
On 4/7/06 at 4:29 AM N7KA@comcast.net wrote:
>There may be some confusion as to difference between a rivnut and a PEM
>nut. They are 2 different animals folks.
>
>PEM nut name is taken from an actual manufacturer of a type of nut pressed
>into the metal. The process of pressing it into the metal actually
>displaces material arond the hole into which it is inserted. A set of
>radial "spokes" is what displaces the metal and holds the nut in place and
>keeps it from turning. Try this web site for Penn Engineering from
>whence the name PEM nut came. Try http://www.pemnut.com OR search for
>Penn Engineering. Lot of good info on the "PEM" nut there.
>
>For rivnuts try http://www.enfasco.com or http://www.emhart.com .
>
>I have nothing to do with any of the above mentioned companies except for
>their being a supplier of these types of products used at the company for
>which I am employeed. I will not get one cent from them if you used a
>million or just one. If you use them correctly and get good results and
>are satisfied with your results, WAY TO GO; if not DON'T BLAME ME.
>
>There are other suppliers but these came to my memory first and a quick
>search on GOOGLE brought them up, first on the list.
>
>73 de Arne N7KA
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