Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R4 20 40 501 10 found under Latch Rim by Southco Inc. The National Stock Number assigned to this part is 5340016479442, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like R4 20 40 501 10.