Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number M21143 2 128 found under Pin Straight Headle by National Aerospace Standards. The National Stock Number assigned to this part is 5315013438477, 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 M21143 2 128.