Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 85-0311-9440-1 found under Adapter Boresight by Wollensak Optical Co. The National Stock Number assigned to this part is 4933004046698, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 85-0311-9440-1.