Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CR 23R 303 BLOX found under Pin Quick Release by Aerofast Inc. The National Stock Number assigned to this part is 5315013880908, 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 CR 23R 303 BLOX.