Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 51398 found under Gage Set Inspection by Mahr Federal Inc. The National Stock Number assigned to this part is 5280001276747, and the Federal Supply Class is 5280 Sets Kits And Outfits Of Measuring Tools. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 51398.