Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S840-0321-B found under Bellows Pressure by Cameron Technologies Us Inc. The National Stock Number assigned to this part is 3010013376935, and the Federal Supply Class is 3010 Torque Converters And Speed Changers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like S840-0321-B.