Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 173-1 1-2SIZE found under Pulley Awning by Sargent And Co. The National Stock Number assigned to this part is 5340005675634, 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 173-1 1-2SIZE.