Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4X99D1 found under Key Machine by Standard Mfg Co Inc. The National Stock Number assigned to this part is 5315013593904, 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 4X99D1.