Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 901-381-800-191 found under Block Assembly Rota by Bell Boeing Joint Project Office. The National Stock Number assigned to this part is 1615015913683, and the Federal Supply Class is 1615 Helicopter Rotor Blades Drive Mechanisms And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 901-381-800-191.