Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SHT.MTL.4IN.DIA found under Pipe Air Conditioning Heating by United Mcgill Corp. The National Stock Number assigned to this part is 4520002778339, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SHT.MTL.4IN.DIA.