Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D1-020873 PIECE 28 found under Screw Cap Socket He by Western Sky Industries Inc. The National Stock Number assigned to this part is 5305013802603, 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 D1-020873 PIECE 28.