Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BL17340-4-31 found under Panel Structural Ai by Thermal Ceramics Inc. The National Stock Number assigned to this part is 1560011237389, and the Federal Supply Class is 1560 Airframe Structural Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like BL17340-4-31.