Stan:
You are correct. A "jam nut" is generally just a plain nut
that is torqued against another nut or threaded part
and prevents unwanted rotation by stretching the bolt
to provide a compressive force between the two nuts. Most often, the
jam nut is thinner than a regular nut but it can most any size.
The part you are discussing is a "lock nut" which also
comes in a variety of designs. The particular type you describe is
an "oval lock" design, where the nut is crimped to provide an
oval shaped thread. It relies on friction between the nut and
bolt threads to provide the locking action. There are a variety
of sub types, including top lock, center lock, hex collars, etc.
Of course, we are all familiar with the Nyloc style of lock nut
found on our LBCs.
Cheers,
Vance
-----Original Message-----
From: owner-6pack@autox.team.net [mailto:owner-6pack@autox.team.net] On
Behalf Of Foster, Stan
Sent: July 27, 2005 2:14 PM
To: JOHN JOHNSON; 6pack@autox.team.net
Subject: RE: Goodparts Rack Mounts
<snip>
I think it was Bob Lang that suggested they were special jam nuts and
they certainly fit the description (shallow, a bugger tighten) but when
I looked them up I saw that jam nuts are normally used in conjunction
with a normal nut to stop the other nut from vibrating loose. We only
get one nut per bolt with this kit so I really don't know what is going
on.
Let us know what your experience is like.
Stan
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