Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4F231 found under Filter Band Pass by Struthers Dunn Inc. The National Stock Number assigned to this part is 5915008244086, and the Federal Supply Class is 5915 Filters And Networks. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4F231.