Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 18-1027 ITEM E17 found under Screw Machine by Rulyn Inc. The National Stock Number assigned to this part is 5305012870838, 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 18-1027 ITEM E17.