Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PC-321-224-BS33312-SK-10 found under Automatic Particle Sizing And Co by Pacific Scientific Instruments. The National Stock Number assigned to this part is 6635010783252, 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 PC-321-224-BS33312-SK-10.