[AT] Fw: Bolt Grades

[Larry D Goss]

FWIW, I ran this thread by a personal friend in Atlanta who does the final 
signoff on all of Delta Airlines' repair work.  For them, the elaborate 
testing that Dave mentions is in place and used continuously.  They don't 
use a single fastener that doesn't have the paperwork with it to prove place 
of origin and conformity to specs.

Larry

> ----- Original Message ----- 
> From: "charlie hill" <chill8 at suddenlink.net>
> To: "Antique tractor email discussion group" 
> <at at lists.antique-tractor.com>
> Sent: Monday, July 02, 2007 4:10 PM
> Subject: Re: [AT] Bolt Grades
>
>
>> Dave I almost wish you hadn't told me that.  I've finally logged enough 
>> air
>> miles to convience myself that those wings CAN flap like a bird without
>> breaking off.  Now you've gone and spoiled that!  LOL
>>
>> Charlie
>> ----- Original Message ----- 
>> From: "Dave Merchant" <nesys_com at ameritech.net>
>> To: "Antique tractor email discussion group" 
>> <at at lists.antique-tractor.com>
>> Sent: Monday, July 02, 2007 1:42 PM
>> Subject: Re: [AT] Bolt Grades
>>
>>
>>> 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.
>>>>
> /mailman/listinfo/at
>>
>