Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21500A25 found under Brick Refractory by Ajax Magnethermec Corp. The National Stock Number assigned to this part is 9350009199281, and the Federal Supply Class is 9350 Refractors And Fire Surfacing Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 21500A25.