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  #1  
Old 07-21-2018, 10:49 PM
SeanM SeanM is offline
 
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Default MS21044N04 can't find torque values anywhere

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

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?
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Old 07-22-2018, 05:01 AM
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Lynnb Lynnb is offline
 
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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
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Old 07-22-2018, 05:18 AM
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plehrke plehrke is offline
 
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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.
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Old 07-22-2018, 09:37 AM
lr172 lr172 is offline
 
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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
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Old 07-22-2018, 09:39 AM
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az_gila az_gila is offline
 
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Quote:
Originally Posted by plehrke View Post
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.
Not quite true...

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

Quickie example here - https://www.experimentalaircraft.inf...building-1.php

In this case, the MS21044 spec. calls the 21044 equivalent to an AN365 nut -
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Last edited by az_gila : 07-22-2018 at 09:50 AM.
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Old 07-22-2018, 10:30 AM
SeanM SeanM is offline
 
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Thank you guys.

Quote:
Originally Posted by az_gila
Quickie example here - https://www.experimentalaircraft.inf...building-1.php

In this case, the MS21044 spec. calls the 21044 equivalent to an AN365 nut -
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.
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Old 07-22-2018, 10:49 AM
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az_gila az_gila is offline
 
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Quote:
Originally Posted by SeanM View Post
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.
If you need a number, 5 inch-lbs seems to be safe -

http://www.mgtd.ca/screw%20torque.htm
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EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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  #8  
Old 07-22-2018, 10:58 PM
SeanM SeanM is offline
 
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Quote:
Originally Posted by az_gila View Post
If you need a number, 5 inch-lbs seems to be safe -

http://www.mgtd.ca/screw%20torque.htm
Perfect, thank you!!
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