Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S1D10025 ITEM 21 found under Spring by Vacco Industries. The National Stock Number assigned to this part is 5360012157054, and the Federal Supply Class is 5360 Coil Flat Leaf And Wire Springs. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like S1D10025 ITEM 21.