Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number TH143 58 found under Pulley Groove by Assembly And Test Worldwide Inc. The National Stock Number assigned to this part is 3020012372771, and the Federal Supply Class is 3020 Gear Pulley Sprocket And Transmission Chain. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like TH143 58.