Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AC51200NW016 found under Spacer Sleeve by Welch Vacuum Technology Inc. The National Stock Number assigned to this part is 5365014248666, and the Federal Supply Class is 5365 Bushings Rings Shims And Spacers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like AC51200NW016.