Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 181-2IN found under Stuffing Box by Columbian Bronze Corp. The National Stock Number assigned to this part is 2040008328065, and the Federal Supply Class is 2040 Marine Hardware And Hull Items. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 181-2IN.