Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BM 04-03 found under Screw Machine by Gorman Rupp Company The. The National Stock Number assigned to this part is 5305015332055, 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 BM 04-03.