Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BK-0H-58D-1553-A2 found under Test Set Subassembly Aircraft Co by Insulation Sources Inc. The National Stock Number assigned to this part is 4920014630934, 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 BK-0H-58D-1553-A2.