Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number USS-175-16-R66 found under by Contrx Industries Inc. The National Stock Number assigned to this part is 5340011554573, 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 USS-175-16-R66.