cferr59 Posted January 14, 2021 Report Posted January 14, 2021 Can anyone identify this screw? It has a smaller head and slightly different angle than the one next to it (which is a common screw for the inspection covers). It appears to be designed for use with the washer next to it. Quote
carusoam Posted January 15, 2021 Report Posted January 15, 2021 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- Quote
cferr59 Posted January 15, 2021 Author Report Posted January 15, 2021 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. Quote
cferr59 Posted January 15, 2021 Author Report Posted January 15, 2021 36 minutes ago, RLCarter said: It’s from the hardware store Aviation aisle at Home Depot? Quote
carusoam Posted January 15, 2021 Report Posted January 15, 2021 See if you can find the detail of the machine screw here... http://skybolt.com/wp-content/uploads/2017/12/Skybolt-AN-MS-NAS-Hardware-12-7-2017.pdf These guys focus on aviation’s fasteners.... Best regards, -a- Quote
Igor_U Posted January 15, 2021 Report Posted January 15, 2021 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. 1 Quote
M20C Tommy Posted January 15, 2021 Report Posted January 15, 2021 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. Quote
N201MKTurbo Posted January 15, 2021 Report Posted January 15, 2021 You will notice that the countersink angles are different. The one on the right looks like the aviation screw. The one on the left looks like Ace Hardware. There are so many Mil specs, but you will find the right one. Quote
PT20J Posted January 15, 2021 Report Posted January 15, 2021 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 2 Quote
RLCarter Posted January 15, 2021 Report Posted January 15, 2021 hardware store screws seem to be soft and tend to strip or break Quote
PT20J Posted January 15, 2021 Report Posted January 15, 2021 Even the “simple” stuff is complicated with fasteners. Sheet metal screws come in type A and type B. Bs have a blunt tip and slightly different thread pitch. Tinnermans are designed for type Bs. Type As will work, but Bs fit better. 1 1 Quote
Prior owner Posted January 15, 2021 Report Posted January 15, 2021 (edited) 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 January 15, 2021 by PilotCoyote 3 1 Quote
Hank Posted January 15, 2021 Report Posted January 15, 2021 Being only 40 Mooney minutes away, I go to Spruce, hand them the screws I need and buy each in bags of 100. The dimpled washers, though, are pricey! 1 Quote
Immelman Posted January 15, 2021 Report Posted January 15, 2021 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. 3 Quote
Prior owner Posted January 15, 2021 Report Posted January 15, 2021 3 hours ago, Hank said: Being only 40 Mooney minutes away, I go to Spruce, hand them the screws I need and buy each in bags of 100. The dimpled washers, though, are pricey! I wish I was that close to a Spruce.. I'd have more reasons to fly. A $100 bag of screws is far more rational than a $100 hamburger 2 Quote
Hank Posted January 15, 2021 Report Posted January 15, 2021 1 hour ago, PilotCoyote said: A $100 bag of screws is far more rational than a $100 hamburger Especially when you need several screws, some oil filters and a couple cases of oil! Then take the crew car for lunch . . . . 1 Quote
jaylw314 Posted January 15, 2021 Report Posted January 15, 2021 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! Quote
Guest Posted January 15, 2021 Report Posted January 15, 2021 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 Quote
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