Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 531900E12074 found under Knob Special by Aai Corporation. The National Stock Number assigned to this part is 5355010425894, 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 531900E12074.