Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AD56-308 found under Sleeve Directional by New Hampshire Ball Bearings Co. The National Stock Number assigned to this part is 1650012496175, and the Federal Supply Class is 1650 Aircraft Hydraulic Vacuum And De-Icing System Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like AD56-308.