Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 123-4403542 PART 106 found under Stud Plain by Huntington Ingalls Incorporated. The National Stock Number assigned to this part is 5307015439378, 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 123-4403542 PART 106.