Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NAS7109-31 found under Screwclose Tolerance by National Aerospace Standards. The National Stock Number assigned to this part is 5305016870390, 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 NAS7109-31.