Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 172-0031 found under Screw Cap Socket He by Faun Frisch Baumaschinen Gmbh. The National Stock Number assigned to this part is 5305121265285, and the Federal Supply Class is 5305 Screws. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 172-0031.