Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 019-0423 PARTS KIT-B2 found under Parts Kit Microscope Optical by Nikon Inc. The National Stock Number assigned to this part is 6545013028476, 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 019-0423 PARTS KIT-B2.