Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 0031.8221 found under Fuseholder Block by Schuster Electronics Inc. The National Stock Number assigned to this part is 5920016058182, 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 0031.8221.