Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 521A19 found under Window Dial by Cardwell Condenser Corp. The National Stock Number assigned to this part is 5355008680676, 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 521A19.