Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1S9179 found under Screw Cap Hexagon Head by Caterpillar Inc. The National Stock Number assigned to this part is 5305004169181, 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 1S9179.