Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6189B found under Bracket Heater by Curtiss Wright Electro Mechanical Corporation Div Steam And Air Solutions. The National Stock Number assigned to this part is 5342010751100, 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 6189B.