Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number DIN7991-M4X16-A 2 found under Screw Cap Socket He by Gw Technologies Pty Ltd. The National Stock Number assigned to this part is 5305121839806, 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 DIN7991-M4X16-A 2.