Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HM029-019-3 found under Spacer Stepped by Robertson Fuel Systemsllc. The National Stock Number assigned to this part is 5365015386637, 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 HM029-019-3.