Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number APX BLF11 YELLOW found under Marker Tube Type by Apex Office Products Inc. The National Stock Number assigned to this part is 7520014966818, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like APX BLF11 YELLOW.