Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 46-231-4 found under Strap Duplicator Bushing by U S Air Tool Co Inc. The National Stock Number assigned to this part is 4920014916246, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 46-231-4.