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What kind of screw is this?


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cf,

it may help if you describe where you got it from?

The place I see that type of washers is usually around the cowling on my O...

If you know where it belongs... that detail can be looked up in the parts catalog... the screw can be ordered with exact detail.

Best regards,

-a-

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13 minutes ago, carusoam said:

cf,

it may help if you describe where you got it from?

The place I see that type of washers is usually around the cowling on my O...

If you know where it belongs... that detail can be looked up in the parts catalog... the screw can be ordered with exact detail.

Best regards,

-a-

It is from an ARI Cowling.  I just looked at the STC and  I believe it is AN507-832R8 (AKA MS24693-C50), but that is what I thought the other one was.  Both of them seem to work, but this one seats better and all of the screws are of this type so if I just change one, it looks strange.

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Aviation hardware has countersunk angle of 100 deg (there are some 130 deg Hi-lites and screws for use on composites) while ACE hardware is, I believe 90 deg.

So, If I see correctly, screw on the left is from local ACE store. ;)

 

 

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2 hours ago, M20C Tommy said:

My go to place for hardware is Aircraft Spruce. Just get a box of 100 for a few bucks. Its the proper structural screw and way more affordable than  Ace.

+1 for using aircraft hardware. These screws are not truly structural screws. There are screws designed for structural application such as MS24694. It's all very confusing with AN, NAS, MS specs. Spruce is a good source. Other good sources are:

http://spenceraircraft.com/

https://skybolt.com/

https://military-fasteners.com/

Skip

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You can also invest $8 and get a paper catalog from Genuine Aircraft Hardware... always a nice reference to have handy. Call them and they can get it to you pretty quickly... https://www.gen-aircraft-hardware.com/

or, as mentioned in another thread, Skybolt website has a lot of pics of hardware, and they are very knowledgeable as well. Go to the upper right hand corner and click on the menu icon, then on the catalog-   https://skybolt.com/

 

Edited by PilotCoyote
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10 hours ago, PilotCoyote said:

You can also invest $8 and get a paper catalog from Genuine Aircraft Hardware... always a nice reference to have handy. Call them and they can get it to you pretty quickly... https://www.gen-aircraft-hardware.com/

or, as mentioned in another thread, Skybolt website has a lot of pics of hardware, and they are very knowledgeable as well. Go to the upper right hand corner and click on the menu icon, then on the catalog-   https://skybolt.com/

 

 

5 hours ago, Immelman said:

Check this out:

https://www.gen-aircraft-hardware.com/

They have detailed PDF files showing the dimensions of the fasteners they sell. Very useful for identifying parts.

Their paper catalog is a absolutely fantastic, and I kept it around as a good reference when I was more active working on the RV.  It has a lot of info on specs and what the MS and NAS numbers actually refer to.  They also have pretty good prices.  The only downside is that their website closes on Sundays!

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Using the screw on the left which has the wrong countersink angle will distort and crack the dimpled countersinks in your inspection covers, and they will never sit flush with the skin.  The one on the right is an MS24693 series screw, formerly AN507 series, non structural screw.

Clarence

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