Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 053-000639 found under by Bel Tronics Corp. The National Stock Number assigned to this part is 5950008516033, 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 053-000639.