[AT] Bolt Grades

Dave Merchant nesys_com at ameritech.net
Mon Jul 2 10:42:06 PDT 2007


This is a huge problem for the FAA  + aircraft operators.

There is a continual flow of counterfeit "aircraft grade" parts from Asia,
often very hard to detect without costly tests.

I don't get on airliners any more...

Dave Merchant


At 01:21 PM 7/2/2007, you wrote:
>I bought some "grade 8" bolts by the pound from a farm supply house (not
>TSC) a few years ago and tried to use them to mount a hitch.  When I put a
>torque wrench on them to set them at the 150 ft/lbs required by the hitch
>manufacturer the nuts pulled the threads off the bolts.  That left the nuts
>less than tight but impossible to remove.  I had to cut them out and start
>over with some REAL grade 8 bolts from an industrial fastener supply house.
>
>I think the first ones were Asian made knock offs.  The moral of the story
>is be careful about buying cheap bolts just because they have grade 8
>markings on them.  I don't have a clue what the UH stands for.  Grade 8
>bolts have 6 straight bar marks radiating out from the center.
>
>Charlie
>----- Original Message -----
>From: "Lew Best" <bee_keeper at earthlink.net>
>To: "'Antique tractor email discussion group'"
><at at lists.antique-tractor.com>
>Sent: Monday, July 02, 2007 11:38 AM
>Subject: Re: [AT] Bolt Grades
>
>
> >I don't know; but TSC has grade 8 bolts; sell them "by the pound" if you
> > have a store nearby.
> >
> > Lew Best near Waco, TX
> >
> > -----Original Message-----
> >
> > I've been on the search for some grade 8 carriage bolts to re-install my
> > gooseneck hitch in my pickup.? After much searching, I stopped by a
> > hitch installer and he gave me four bolts that he was "pretty sure" were
> > grade 8, but he left some doubt in my mind.? So I thought I'd ask the
> > list is anyone can interpret the stamping on the bolt head.? It says
> > "UH" and nothing else.? I thought all grade 8 bolts were supposed to be
> > yellow?? I figured I should use the best bolts I can find since they are
> > really the only thing holding the trailer to the truck.
> >
> > Enjoy, Joe
> >
> >
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Dave Merchant
kosh at nesys.com
nesys_com at ameritech.net

http://www.nesys.com
http://www.nesys.org





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