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Torque values

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madriver(at)wildblue.net
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Posted: Sat Mar 15, 2008 4:57 pm Post subject: Torque values

I know one of you - or mabe more - will know what the  " rule of thumb value in inch lb "  is added to the torque wrench when tightening AN365 3, 4, and 5 self locking (fiber lock type)  nuts.  I have the straight torque values - is there a reference for the additive values?

   

 Phil  CH-701 in Southern Idaho

  

 90% done about three months or so to go! 

  [quote][b]

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craig(at)craigandjean.com
Guest

Posted: Sat Mar 15, 2008 6:43 pm Post subject: Torque values

The stuff I read said that you measure the drag torque with your torque

wrench before the nut starts touching the surface to be clamped. For the

small nuts I couldn't do this with my CompuTorq3 electronic wrench as it

doesn't start registering until 20 or so inch-pounds. I guessed around 5

inch-pounds.  What I finally found that helped was table 7-2 in AC 43.13-1B

(Acceptable Methods.). "Minimum prevailing torque values for re-used

self-locking nuts". This tells you how much drag torque a SL nut needs to

have for it to be safe to reuse it. I reasoned that this must be a pretty

good guide to the minimum drag in a *new* SL nut.



 



For fine threads the table says:



 



7/16-20                 8 in-lbs



1/2-20                   10 in-lbs



9/16-18                 13 in-lbs

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