Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1856001-1 found under Wedge Lighting by O And S Research Inc. The National Stock Number assigned to this part is 6610009392640, and the Federal Supply Class is 6610 Flight Instruments. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1856001-1.