Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 74A450638-2003 found under Pin Hollow by Nassau Tool Works Inc. The National Stock Number assigned to this part is 5315014565654, and the Federal Supply Class is 5315 Nails Machine Keys And Pins. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 74A450638-2003.