Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 144US143 found under Standoff Threaded Spacing by O F Mossberg And Sonsincorporated. The National Stock Number assigned to this part is 5340004570510, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 144US143.