Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number USM1I found under Fuseholder Block by Ferraz Shawmut Inc. The National Stock Number assigned to this part is 5920015518088, 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 USM1I.