Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 25172B00 found under Ring Retaining by Hoosier Industrial Supply Inc. The National Stock Number assigned to this part is 5325000457365, and the Federal Supply Class is 5325 Fastening Devices. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 25172B00.