Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number T-R-12497-B found under Gage Ring Master Se by Eaton Aerospace Ltd. The National Stock Number assigned to this part is 5220014829486, 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 T-R-12497-B.