Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B3-146 found under Screw Machine by Fl Aerospace Corp Janitrol Aero. The National Stock Number assigned to this part is 5305006162807, 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 B3-146.