Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B1855A found under Screw Shaft And Bearing Assy by Beaver Precision Products Inc. The National Stock Number assigned to this part is 2990005947040, and the Federal Supply Class is 2990 Miscellaneous Engine Accessories Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B1855A.