Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number TT-020 found under Ring Retaining by Dana Marine Products Llc. The National Stock Number assigned to this part is 5325016053917, 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 TT-020.