Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 645B11 found under Sensor Vibration by Pcb Piezotronicsinc. The National Stock Number assigned to this part is 2590016616895, and the Federal Supply Class is 2590 Miscellaneous Vehicular Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 645B11.