Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 63A0257 found under Fuseholder Extractor Post by Siemens Energy And Automation Inc. The National Stock Number assigned to this part is 5920009014731, and the Federal Supply Class is 5920 Fuses Arresters Absorbers And Protector. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 63A0257.