Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MS21295-42 found under Screw Machine by Exxon Mobil Corporation. The National Stock Number assigned to this part is 5305006300197, 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 MS21295-42.