Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 44B3721-138A found under Pad Wear Steam Inle by Carrier Corporation. The National Stock Number assigned to this part is 2825011694940, and the Federal Supply Class is 2825 Steam Turbines And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 44B3721-138A.