Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HS4874-4B3A found under Grommet Metallic by Mcdonnell Douglas Helicopter. The National Stock Number assigned to this part is 5325011773704, 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 HS4874-4B3A.