Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B547-590 found under Knob by Chatham Controls Corp. The National Stock Number assigned to this part is 5355008969527, and the Federal Supply Class is 5355 Knobs And Pointers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B547-590.