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07-21-2018, 10:49 PM
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Join Date: Feb 2017
Location: Utah
Posts: 26
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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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07-22-2018, 05:01 AM
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Join Date: Jan 2014
Location: Cedar Hill, TX
Posts: 330
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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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RV-10 in Process
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07-22-2018, 05:18 AM
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Join Date: Sep 2006
Location: Defiance, MO
Posts: 1,674
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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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Philip
RV-6A - 14+ years, 950+ hours
Based at 1H0 (Creve Coeur)
Paid dues yearly since 2007
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07-22-2018, 09:37 AM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,298
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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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N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
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07-22-2018, 09:39 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by plehrke
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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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 -
__________________
Gil Alexander
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
Last edited by az_gila : 07-22-2018 at 09:50 AM.
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07-22-2018, 10:30 AM
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Join Date: Feb 2017
Location: Utah
Posts: 26
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Thank you guys.
Quote:
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Originally Posted by az_gila
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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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07-22-2018, 10:49 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by SeanM
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.
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If you need a number, 5 inch-lbs seems to be safe -
http://www.mgtd.ca/screw%20torque.htm
__________________
Gil Alexander
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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07-22-2018, 10:58 PM
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Join Date: Feb 2017
Location: Utah
Posts: 26
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Quote:
Originally Posted by az_gila
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Perfect, thank you!!
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