Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B1-3959-54 found under Bolt U by Qinetiq Ltd. The National Stock Number assigned to this part is 5306999622655, and the Federal Supply Class is 5306 Bolts. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B1-3959-54.