Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number QD3121 0 A E 12 found under Screw Cap Hexagon H by Pall France Sa Division. The National Stock Number assigned to this part is 5305142887587, 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 QD3121 0 A E 12.