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williamtsullivan(at)att.n
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 Posted: Sat Mar 27, 2010 10:24 am Post subject: prop bolts |
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Rick- I have no documentation of the difference in torque on various types of locknuts. But I suggest you try it, and observe the difference. Take a bolt and put it threads up in a vice. The bigger the better. Then use a beam type torque wrench and screw a nylock down. Dot it a few times, and the torque resistance is a lot lower. A grade 5 deformed nut has much more resistance, and a grade 8 is very difficult to turn- without being bottomed out. Using a 5/8" bolt, the deformed nuts can stall an impact wrench before bottoming out. I spent almost 40 years as a truck mechanic- the deformed ones can hurt.
Bill Sullivan
Windsor Locks, Ct.
FS 447
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Sat Mar 27, 2010 10:59 am Post subject: prop bolts |
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Bill, I don't use grade 5 or 8 anywhere on any aircraft I own. I use AN, NAS, or MS spec fasteners. Notice on the interchangeability table on page 2 that the 21042-4 can be used as a replacement for both the AN 365 Nylock and the AN 363. By definition interchangeability means there is no difference on installation.
Rick
On Sat, Mar 27, 2010 at 1:06 PM, william sullivan <williamtsullivan(at)att.net (williamtsullivan(at)att.net)> wrote:
[quote] Rick- I have no documentation of the difference in torque on various types of locknuts. But I suggest you try it, and observe the difference. Take a bolt and put it threads up in a vice. The bigger the better. Then use a beam type torque wrench and screw a nylock down. Dot it a few times, and the torque resistance is a lot lower. A grade 5 deformed nut has much more resistance, and a grade 8 is very difficult to turn- without being bottomed out. Using a 5/8" bolt, the deformed nuts can stall an impact wrench before bottoming out. I spent almost 40 years as a truck mechanic- the deformed ones can hurt.
Bill Sullivan
Windsor Locks, Ct.
FS 447
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williamtsullivan(at)att.n
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| Posted: Sat Mar 27, 2010 11:12 am Post subject: prop bolts |
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I don't have the interchange charts. I am just issuing a caution based on experience with SAE and USS bolts. Those deformed grade 8 nuts were nasty, and grade 5 was only a little easier. Virtually guaranteed not to loosen, though.
Bill Sullivan
Windsor Locks, Ct.
FS 447
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