Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 211-SSMOD-HEXHD-20 found under Screw Panel Fastener by R A F Electronic Hardware Inc. The National Stock Number assigned to this part is 5305016051221, and the Federal Supply Class is 5305 Screws. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 211-SSMOD-HEXHD-20.