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  #1  
Old 08-05-2021, 03:52 PM
StephenMiner StephenMiner is offline
 
Join Date: Nov 2020
Location: Farmington, UT
Posts: 12
Red face COWLING SCREWS STRIPPED

After quite a few oil changes and taking the cowling off and putting back on numerous times, a few of the screws are stripped. I contacted vans to get replacements but they want to know the part numbers for the screws. I am having a hard time finding the screw part numbers for the RV-12 (everything on the top and bottom cowling). I am not the original builder. Any ideas what all the screws part numbers are along with the washers? Any help is appreciated!
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  #2  
Old 08-05-2021, 06:39 PM
olegusan olegusan is offline
 
Join Date: Aug 2014
Location: Melbourne, Australia
Posts: 37
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Screw: AN526C832R8
Locknut: K1000-08

Page 38-07 of the assembly manual
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RV-12 # 120877 VH-TAO (Flying)
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  #3  
Old 08-05-2021, 06:45 PM
Mich48041 Mich48041 is offline
 
Join Date: Apr 2008
Location: Riley TWP MI
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Cowl screws: AN526C832R8 SS MACHINE SCREW $0.10 at Aircraft Spruce.
Washer possibly NAS1515H08L $0.03
If you need new instrument panel screws, use MS35206-228.
The heads do not strip out as easily as original screws.
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RV-12 Flying
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  #4  
Old 08-05-2021, 07:07 PM
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jrock836 jrock836 is offline
 
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Location: Burleson, Texas
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Per the info provided by Van's, I switched to washer head screws..
AN525-832R8

https://vansairforce.net/community/s...=193497&page=3
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Last edited by jrock836 : 08-05-2021 at 07:09 PM.
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  #5  
Old 08-05-2021, 07:37 PM
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rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
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Quote:
Originally Posted by jrock836 View Post
Per the info provided by Van's, I switched to washer head screws..
AN525-832R8

https://vansairforce.net/community/s...=193497&page=3
This is the screw specified in the KAI.

The un-threaded portion of the shank reduces wear on the cowl and enlargement of the holes (important on the RV-12 in particular since the fiberglass is not very thick).
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.

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Hubbard, Oregon
Van's Aircraft Engineering Prototype Shop Manager
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  #6  
Old 08-05-2021, 07:46 PM
Bob Y Bob Y is offline
 
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Location: Piedmont, SC
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Are the AN526C832R8 screws still recommended for the cowl hinge pins?
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  #7  
Old 08-05-2021, 07:52 PM
seagull seagull is offline
 
Join Date: Dec 2019
Location: San Bernardino
Posts: 391
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Quote:
Originally Posted by Mich48041 View Post
If you need new instrument panel screws, use MS35206-228.
The heads do not strip out as easily as original screws.
Are you sure about that part #? Mine are black flat heads;
https://www.aircraftspruce.com/catal...S35206-228.php
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  #8  
Old 08-05-2021, 07:59 PM
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rvbuilder2002 rvbuilder2002 is offline
 
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Quote:
Originally Posted by Bob Y View Post
Are the AN526C832R8 screws still recommended for the cowl hinge pins?
Yes, they are.
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.

Scott McDaniels
Hubbard, Oregon
Van's Aircraft Engineering Prototype Shop Manager
FAA/DAR
RV-6A (aka "Junkyard Special ")
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  #9  
Old 08-05-2021, 07:59 PM
seagull seagull is offline
 
Join Date: Dec 2019
Location: San Bernardino
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Quote:
Originally Posted by rvbuilder2002 View Post
The un-threaded portion of the shank reduces wear on the cowl and enlargement of the holes (important on the RV-12 in particular since the fiberglass is not very thick).
I can see the logic, especially if the screws are not kept tight. I have 750 hours on mine with the non-shouldered screws and the cowl has no slop.

Those shouldered cad plated screws are pretty ugly on a nice paint job, I prefer stainless.
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  #10  
Old 08-05-2021, 08:04 PM
Mich48041 Mich48041 is offline
 
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Location: Riley TWP MI
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I am pretty sure that MS35206-228 are the screws that are on my instrument panel. They are not the original screws. Yours are likely different.
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