Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NAS1131-12 found under Screw Close Tolerance by Lawrence Engineering And Supply Inc. The National Stock Number assigned to this part is 5305000055927, 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 NAS1131-12.