Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number T172-600 found under Gage Plug Go Not Go by Sps Technologies Inc. The National Stock Number assigned to this part is 5220004784141, and the Federal Supply Class is 5220 Inspection Gages And Precision Layout Tools. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like T172-600.