Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BU0437813-4 found under Stud Drum Stop by Kadon Corp. The National Stock Number assigned to this part is 5307007155668, and the Federal Supply Class is 5307 Studs. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like BU0437813-4.