Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R4 10 20 101 20 found under Latch Snapslide Fastener by Southco Inc. The National Stock Number assigned to this part is 5325016616185, 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 R4 10 20 101 20.