Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 53M025-128 found under Delay Line by Polara Engineering Inc. The National Stock Number assigned to this part is 5999013457386, and the Federal Supply Class is 5999 Miscellaneous Electrical And Electronic Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 53M025-128.