Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PSR3-1X found under Screw Tappet by Marine Engine Specialties Div Of. The National Stock Number assigned to this part is 5305003641343, 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 PSR3-1X.