Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 305074-1057 PIECE 198 found under Screw Car Flat Head by Diamond Power International Inc. The National Stock Number assigned to this part is 5305011191834, 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 305074-1057 PIECE 198.