Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D2774-4S9 found under Pin Lock by Chief Of Engineers. The National Stock Number assigned to this part is 5315003684292, 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 D2774-4S9.