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MS21044N04 can't find torque values anywhere

S

SeanM

Member
Surely I can't be the only one that is having a hard time tracking down the torque spec for MS21044N04? I can find data sheets for it online, but the torque information is never listed :confused:

pic of instructions here: https://imgur.com/a/O0hfQB5

I'm trying to assemble the stall warning subassembly (uses two MS21044N04) and i've spent more time than I care to admit searching online for the torque values.

Is it somewhere obvious and I'm just missing it? :confused:
 
I'm no expert, but I think you look for a torque spec on the bolt/screw not the nut. But a MS24693-S10 is so small having a torque wrench small enough for it would be rare. Just use your best judgment, make sure it's tight and you have enough threads coming out of the lock nut and it won't go anywhere.

Lynn
 
Although you apply torque to the nut, it is the bolt that sets proper torque. You will never break a nut from over torgueing but you will break the bolt. Bolt sets joint strength, nut just ensures bolt reaches rated strength.
 
From my somewhat limited understanding, except for special high or low strength bolts, most torque values are standardized by thread size and I think you'll find that in the AC. Exceptions may apply for special structural applications, of course.

Larry
 
plehrke said:
Although you apply torque to the nut, it is the bolt that sets proper torque. You will never break a nut from over torgueing but you will break the bolt. Bolt sets joint strength, nut just ensures bolt reaches rated strength.
Click to expand...

Not quite true...

The torque tables have different torque values for full nuts and the thinner shear nuts.

Quickie example here - https://www.experimentalaircraft.info/articles/aircraft-building-1.php

In this case, the MS21044 spec. calls the 21044 equivalent to an AN365 nut -
 
Last edited:
Thank you guys.

az_gila said:
Quickie example here - https://www.experimentalaircraft.info/articles/aircraft-building-1.php

In this case, the MS21044 spec. calls the 21044 equivalent to an AN365 nut -
Click to expand...

Ahh interesting.


Using the screw MS24693S10 this is the information I have:
Length: 1 inch
thread: 4-40
thread diameter: 0.112 inches

I'm not seeing 4-40 in the table from that link. I'm also not seeing it in the AC https://imgur.com/a/AbiTUD2 for self locking nuts.


I'm considering taking Lynnbs advice since it's so small. But it does bother me a bit because I have been so particular with torque on every other nut on the plane.
 
SeanM said:
Thank you guys.



Ahh interesting.


Using the screw MS24693S10 this is the information I have:
Length: 1 inch
thread: 4-40
thread diameter: 0.112 inches

I'm not seeing 4-40 in the table from that link. I'm also not seeing it in the AC https://imgur.com/a/AbiTUD2 for self locking nuts.


I'm considering taking Lynnbs advice since it's so small. But it does bother me a bit because I have been so particular with torque on every other nut on the plane.
Click to expand...

If you need a number, 5 inch-lbs seems to be safe -

http://www.mgtd.ca/screw torque.htm
 
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