Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number H-09-0025-4 MK-K found under Adapter Press Mandrel Seal Assem by Ajax Magnethermec Corp. The National Stock Number assigned to this part is 4920011459580, 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 H-09-0025-4 MK-K.