Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MC50 found under Pin Disengager by Insinger Machine Company The. The National Stock Number assigned to this part is 5315000971755, 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 MC50.