Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 993-2421-1 found under Analyzer Coagulatio by Dade Behring Inc. The National Stock Number assigned to this part is 6550015191900, 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 993-2421-1.