Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4-40X5 16-SB-BN1 found under Screw Machine by Align Aerospace Llc. The National Stock Number assigned to this part is 5305013390514, 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 4-40X5 16-SB-BN1.