AN Screw Specification Decoding

[farmrjohn]

I've searched to no avail. Is there a source to decode the AN specifications for screws? For example: AN526C632-6 or AN515-6-6 (these specifications from the Ercoupe parts manuals). It seems like the first group of numbers is the head style, the second group the thread (#6, 32 pitch?) and the last length in 16ths? John

 

[Capt. Geoffrey Thorpe]

hth

 

[Let'sgoflying!]

I think these are machine screws, Capt. G. (I only see 'bolts' in your pdf - ah yes useful for the decoding)
John - check out aircraft spruce, they used to have some charts with it all broken down.

 

[wilkersk]

AN526 is a "Truss Head Screw. The C means its stainless, 632 means its a #6 diameter with 32 thread-per-inch pitch. And, the -6 means its 6/16ths (or 3/8ths) inch long.

This info is all in a A&P pocket guide. There's several different ones available. https://www.amazon.com/Standard-Aircraft-Handbook-Mechanics-Technicians/dp/0071826793/ref=sr_1_2?s=books&ie=UTF8&qid=1528947665&sr=1-2&keywords=A&P+Mechanic

http://www.aircraftspruce.com/catalog/hapages/an526.php

 

[Capt. Geoffrey Thorpe]

(I only see 'bolts' in your pdf

DOOH

 

[farmrjohn]

Thanks for the replies. The tip about the A&P pocket guide led me to check AC43.13-1B and it describes the various screws on pg. 7-294 and depicts them in table 7-11 on pg. 7-341. John

 

[wilkersk]

The Standard Aircraft Handbook, I linked to above, gives you part number break down for most of the common hardware. Its a bit more detailed than the AC43.13. Pretty handy to have if you're an aspiring A&P, or even just an aircraft owner.

 

[JAWS]

https://www.askbob.aero/sites/default/files/Genuine_Aircraft_Hardware_Catalog.pdf