Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HS5239A3120 found under Connector Receptacl by Mcdonnell Douglas Helicopter. The National Stock Number assigned to this part is 5935012607593, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HS5239A3120.