Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MS20392 4P21 found under Pin Straight Headed by Bisco Industries Inc. The National Stock Number assigned to this part is 5315016607706, 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 MS20392 4P21.