[AT] Bolt Grades

[charlie hill]

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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