Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HS3031UR225S found under Ring Retaining by Mcdonnell Douglas Helicopter. The National Stock Number assigned to this part is 5325011790842, 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 HS3031UR225S.