According to the Standard Aircraft Handbook, 4th Edition, the torque for a 5/8-18 Standard, Fine Thread bolt and nut (AN310, AN 315) is 1,100-1,300(ft.lbs.). The 5/8-18 Fine Thread, Shear Nut (AN320, 316, AN23 thru AN31) is 660-740. The 5/8-11 Coarse Thread Standard is 700-900, and Coarse Thread Shear is 425-540. The "AN" numbers is the same for coarse and fine thread.
Rick ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> Sent: Thursday, November 11, 1999 9:30 PM Subject: Re: Torque Values for Wing Bolts on Mooney M-10 > Tom, > > According to an A&P friend of mine who takes the wings off his plane every > winter, there are no torque values published by Erco or Alon for these bolts > (He didn't mention Mooney. Maybe they published a value.) According to him > you use the specs for the size bolt as published in the standard aircraft > hardware manuals. I THINK (as in - don't bet your life on it!!) that the > torque for the big 5/8 inch bolts is about 100 ft lbs. Not sure about the > smaller ones. > > I had a discussion about these bolts with a mechanical engineer friend of > mine, and he explained to me that the strength in the wing attach joint on > the Coupe comes from the friction developed between the spar attach fittings > when the wing bolts are torqued. According to him (and his text books), the > wing attach bolts are actually loaded in tension, not in shear. (I would > have bet money that those bolts were loaded in shear!! Shows what happens > when I bet money on something that I really don't know anything about!!) > > That's more than you asked, I know. Point is, make sure you get the correct > value and torque them properly. They're not supposed to be loose at all. > You should be able to borrow a handbook from any A&P and look up the values > in it. > > As always, this info is offered for entertainment purposes only... I'm not an > aeronautical engineer and am not offering professional advice. Consult an > aviation professional. Your mileage may vary. Rates subject to change. > One size probably won't fit all. Etc... > > Wayne DelRossi > Alon N5618F >
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