Changing Hardware

[50Pesos]

The locking nylock nuts that hold the brakes on I'd like to use all metal nuts. I am trying to convert AN365-428. Not knowing all the right shear and torsion requirements has me paused but I think ms21043-4 hex nuts might do the trick but I'm not 100% about the finish. Is there and easy to use chart or reference to do this right?

 

[David Paule]

You're better off getting the MS21042 nuts instead, since that specification explicitly says that it is interchangeable with AN365 nuts, which the nut you mentioned does not. As for finish, Aircraft Spruce offers these as either dry or lubed nuts and I think I'd be leaning towards the lubed ones -- provided I could find an appropriate torque spec for those; it should be less than for the dry ones. If I could not, by all means get the dry ones. In either case, you'll need to add the running torque to the specified torque. For the dry ones, Chapter 5, page 05-20 (at least in the revision I have) has torque for those, and specifies 85 inch pounds.

You'll even save a bit of weight with these.

Dave

 

[RV7A Flyer]

The locking nylock nuts that hold the brakes on I'd like to use all metal nuts.?

Any particular reason why? Just curious...

 

[jrs14855]

Lock Nuts

AN363 or MS21045-4 are the best. They have very narrow slots that allow symmetrical locking grip on bolts. MS21042 has a slightly oval end which does not grip the bolt as well and does not survive many re uses.

 

[mwtucker]

Lock Nuts

AN363 or MS21045-4 are the best. They have very narrow slots that allow symmetrical locking grip on bolts. MS21042 has a slightly oval end which does not grip the bolt as well and does not survive many re uses.

I've noticed that some sites have photos of the AN363 and MS21045 that are different: some show slots in the nut; others no slot. Below is a photo of AN363-428 (MS-21045-4) nuts that I just received from Aircraft Spruce. Does anyone know the difference?

Thanks,
Mike

 

[PhatRV]

I've noticed that some sites have photos of the AN363 and MS21045 that are different: some show slots in the nut; others no slot. Below is a photo of AN363-428 (MS-21045-4) nuts that I just received from Aircraft Spruce. Does anyone know the difference?

Thanks,
Mike

It depends on what they have on hand. Most of the time, I got the slotted nut but sometime, they gave me the solid nuts.

 

[rockyfatcat]

Lock Nuts

AN363 or MS21045-4 are the best. They have very narrow slots that allow symmetrical locking grip on bolts. MS21042 has a slightly oval end which does not grip the bolt as well and does not survive many re uses.

I made the mistake of reusing a fiber lock nut ONE TIME!

I a new nut is really really cheap.