Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R66172B13785 found under Fuse Cartridge by Unifab Industries Inc. The National Stock Number assigned to this part is 5920009395442, 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 R66172B13785.