Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1S-5399-1 ITEM 51 1S-5416 found under Coil Electrical by Ruggles Klingemann Mfg Co. The National Stock Number assigned to this part is 5950006461152, and the Federal Supply Class is 5950 Coils And Transformers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1S-5399-1 ITEM 51 1S-5416.