Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number WH1028TB found under Screw Cap Hexagon Head by R B And W Corp. The National Stock Number assigned to this part is 5305011858668, 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 WH1028TB.